LeetCode

Overview

This repository contains my LeetCode submissions, with entries sorted by:

• Difficulty: Easy, Medium, Hard.
• Question title.

The concepts applied to solve these questions are explained in my Learning repository.

(Note: Rank indicates the percentage of submissions that my code outperforms in terms of runtime.)

Category	Content
Challenges	Blind 75, Grind 75, Grind 169, NeetCode 150, SQL 45
Courses	AlgoMonster, Grokking Data Structures & Algorithms for Coding Interviews, Grokking the Art of Recursion for Coding Interviews, Grokking the Coding Interview: Patterns for Coding Questions, Leetcode Top Interview Questions (Easy Collection)
Topics	Array, Backtracking, Binary Indexed Tree, Binary Search, Binary Search Tree, Binary Tree, Bit Manipulation, Bitmask, Brainteaser, Breadth First Search, Bucket Sort, Combinatorics, Counting, Counting Sort, Data Stream, Database, Depth First Search, Design, Divide and Conquer, Doubly Linked List, Dynamic Programming, Enumeration, Game Theory, Geometry, Graph, Greedy, Hash Function, Hash Table, Heap (Priority Queue), Interactive, Iterator, Linked List, Math, Matrix, Memoization, Merge Sort, Monotonic Queue, Monotonic Stack, Number Theory, Ordered Set, Prefix Sum, Probability and Statistics, Queue, Quick Select, Radix Sort, Randomized, Recursion, Reservoir Sampling, Rolling Hash, Segment Tree, Simulation, Sliding Window, Sorting, Stack, String, String Matching, Topological Sort, Tree, Trie, Two Pointers, Union Find

Performance

Submissions

Easy

Question	Submission	Runtime	Rank
A Number After a Double Reversal	Java	0ms	100%
Absolute Difference Between Maximum and Minimum K Elements	Java	1ms	100%
Account Balance After Rounded Purchase	Java	0ms	100%
Add Binary	Java	2ms	99.94%
Add Digits	Java	0ms	100%
Add Strings	Java	2ms	61.51%
Add Two Integers	Java	0ms	100%
Add to Array-Form of Integer	Java	2ms	99.20%
Adjacent Increasing Subarrays Detection I	Java	2ms	38.87%
Alternating Digit Sum	Java	0ms	100%
Alternating Groups I	Java	1ms	97.05%
Ant on the Boundary	Java	0ms	100%
Apple Redistribution into Boxes	Java	1ms	100%
Apply Operations to an Array	Java	1ms	95.99%
Arranging Coins	Java	9ms	9.79%
Array Partition	Java	12ms	97.33%
Article Views I	SQL	619ms	51.14%
Assign Cookies	Java	11ms	35.51%
Available Captures for Rook	Java	0ms	100%
Average Salary Excluding the Minimum and Maximum Salary	Java	0ms	100%
Average Value of Even Numbers That Are Divisible by Three	Java	0ms	100%
Average of Levels in Binary Tree	Java	2ms	94.44%
Backspace String Compare	Java	1ms	78.15%
Balanced Binary Tree	Java	0ms	100%
Base 7	Java	1ms	70.47%
Baseball Game	Java	2ms	96.48%
Best Poker Hand	Java	0ms	100%
Best Time To Buy And Sell Stock	Java	2ms	72.40%
Big Countries	SQL	461ms	66.33%
Biggest Single Number	SQL	406ms	82.18%
Binary Gap	Java	1ms	40.87%
Binary Number with Alternating Bits	Java	0ms	100%
Binary Prefix Divisible by 5	Java	3ms	98.17%
Binary Search	Java	0ms	100%
Binary Tree Inorder Traversal	Java	0ms	100%
Binary Tree Paths	Java	1ms	98.42%
Binary Tree Postorder Traversal	Java	0ms	100%
Binary Tree Preorder Traversal	Java	0ms	100%
Binary Tree Tilt	Java	0ms	100%
Bitwise OR of Even Numbers in an Array	Java	0ms	100%
Buddy Strings	Java	1ms	99.49%
Build Array from Permutation	Java	1ms	99.07%
Button with Longest Push Time	Java	0ms	100%
Buy Two Chocolates	Java	1ms	100%
Calculate Amount Paid in Taxes	Java	0ms	100%
Calculate Delayed Arrival Time	Java	0ms	100%
Calculate Digit Sum of a String	Java	1ms	92.62%
Calculate Money in Leetcode Bank	Java	3ms	5.77%
Can Make Arithmetic Progression From Sequence	Java	2ms	98.24%
Can Place Flowers	Java	1ms	97.29%
Capitalize the Title	Java	3ms	88.41%
Categorize Box According to Criteria	Java	0ms	100%
Cells in a Range on an Excel Sheet	Java	1ms	100%
Cells with Odd Values in a Matrix	Java	1ms	85.31%
Check Array Formation Through Concatenation	Java	0ms	100%
Check Balanced String	Java	1ms	98.64%
Check Distances Between Same Letters	Java	1ms	90.31%
Check Divisibility by Digit Sum and Product	Java	0ms	100%
Check If All 1's Are at Least K Places Away	Java	1ms	100%
Check If Digits Are Equal in String After Operations I	Java	8ms	78.87%
Check If It Is a Straight Line	Java	0ms	100%
Check If N And Its Double Exist	Java	1ms	99.29%
Check If String Is a Prefix of Array	Java	1ms	87.61%
Check If Two String Arrays are Equivalent	Java	0ms	100%
Check If a Word Occurs As a Prefix of Any Word in a Sentence	Java	0ms	100%
Check Whether Two Strings are Almost Equivalent	Java	0ms	100%
Check if All A's Appears Before All B's	Java	0ms	100%
Check if All Characters Have Equal Number of Occurrences	Java	1ms	99.69%
Check if All the Integers in a Range Are Covered	Java	0ms	100%
Check if Any Element Has Prime Frequency	Java	0ms	100%
Check if Array is Good	Java	2ms	74.84%
Check if Array Is Sorted and Rotated	Java	0ms	100%
Check if Binary String Has at Most One Segment of Ones	Java	0ms	100%
Check if Bitwise OR Has Trailing Zeros	Java	0ms	100%
Check if Every Row and Column Contains All Numbers	Java	4ms	92.01%
Check if Grid Satisfies Conditions	Java	4ms	92.01%
Check if Matrix Is X-Matrix	Java	0ms	100%
Check if Number Has Equal Digit Count and Digit Value	Java	0ms	100%
Check if Numbers Are Ascending in a Sentence	Java	0ms	100%
Check if One String Swap Can Make Strings Equal	Java	0ms	100%
Check if Strings Can be Made Equal With Operations I	Java	1ms	99.28%
Check if The Number is Fascinating	Java	0ms	100%
Check if Two Chessboard Squares Have the Same Colour	Java	0ms	100%
Check if Word Equals Summation of Two Words	Java	0ms	100%
Check if a String Is an Acronym of Words	Java	1ms	100%
Check if the Sentence Is Pangram	Java	0ms	100%
Circular Sentence	Java	1ms	93.68%
Classes More Than 5 Students	SQL	471ms	96.18%
Clear Digits	Java	1ms	100%
Climbing Stairs	Java	0ms	100%
Combine Two Tables	SQL	629ms	96.12%
Complement of Base 10 Integer	Java	0ms	100%
Compute Alternating Sum	Java	1ms	94.44%
Compute Decimal Representation	Java	1ms	100%
Concatenate Non-Zero Digits and Multiply By Sum I	Java	1ms	99.92%
Concatenation of Array	Java	1ms	96.28%
Consecutive Characters	Java	1ms	99.83%
Contains Duplicate	Java	9ms	99.19%
Contains Duplicate II	Java	18ms	89.16%
Convert 1D Array into 2D Array	Java	2ms	100%
Convert Binary Number in a Linked List to Integer	Java	0ms	100%
Convert Date to Binary	Java	4ms	66.45%
Convert Integer to the Sum of Two No-Zero Integers	Java	0ms	100%
Convert Sorted Array to Binary Search Tree	Java	0ms	100%
Convert the Temperature	Java	0ms	100%
Count Binary Substrings	Java	6ms	99.70%
Count Common Words With One Occurrence	Java	6ms	89.98%
Count Complete Tree Nodes	Java	0ms	100%
Count Distinct Numbers on Board	Java	0ms	100%
Count Dominant Indices	Java	1ms	100%
Count Elements With Maximum Frequency	Java	0ms	100%
Count Elements With Strictly Smaller and Greater Elements	Java	0ms	100%
Count Equal and Divisible Pairs in an Array	Java	3ms	99.52%
Count Good Triplets	Java	10ms	79.74%
Count Integers With Even Digit Sum	Java	1ms	86.87%
Count Items Matching a Rule	Java	3ms	98.81%
Count Largest Group	Java	3ms	96.75%
Count Monobit Integers	Java	1ms	99.20%
Count Negative Numbers in a Sorted Matrix	Java	0ms	100%
Count Number of Pairs With Absolute Difference K	Java	1ms	98.63%
Count Odd Numbers in an Interval Range	Java	0ms	100%
Count Operations to Obtain Zero	Java	1ms	90.10%
Count Pairs Of Similar Strings	Java	58ms	41.34%
Count Pairs That Form a Complete Day I	Java	1ms	97.87%
Count Pairs Whose Sum is Less than Target	Java	1ms	100%
Count Partitions with Even Sum Difference	Java	1ms	50.87%
Count Prefix and Suffix Pairs I	Java	2ms	99.94%
Count Prefixes of a Given String	Java	0ms	100%
Count Residue Prefixes	Java	1ms	99.96%
Count Special Quadruplets	Java	12ms	86.95%
Count Square Sum Triples	Java	4ms	96.87%
Count Subarrays of Length Three With a Condition	Java	1ms	100%
Count Substrings That Satisfy K-Constraint I	Java	2ms	52.78%
Count Symmetric Integers	Java	44ms	25.05%
Count Tested Devices After Test Operations	Java	0ms	100%
Count Vowel Substrings of a String	Java	6ms	69.73%
Count of Matches in Tournament	Java	0ms	100%
Count the Digits That Divide a Number	Java	0ms	100%
Count the Number of Consistent Strings	Java	6ms	86.92%
Count the Number of Special Characters I	Java	1ms	100%
Count the Number of Vowel Strings in Range	Java	1ms	100%
Counting Bits	Java	2ms	95%
Counting Words With a Given Prefix	Java	0ms	100%
Coupon Code Validator	Java	20ms	49.03%
Cousins in Binary Tree	Java	1ms	26.22%
Crawler Log Folder	Java	1ms	99.52%
Create Target Array in the Given Order	Java	0ms	100%
Customers Placing The Largest Number Of Orders	SQL	799ms	87.57%
Customers Who Never Order	SQL	908ms	93.29%
Decode XORed Array	Java	1ms	99.27%
Decode the Message	Java	4ms	93.90%
Decompress Run-Length Encoded List	Java	0ms	100%
Decrypt String from Alphabet to Integer Mapping	Java	1ms	79.11%
Defanging an IP Address	Java	0ms	100%
Defuse the Bomb	Java	4ms	6.06%
Degree of an Array	Java	5ms	95.49%
Delete Characters to Make Fancy String	Java	25ms	81.54%
Delete Columns to Make Sorted	Java	8ms	64.79%
Delete Greatest Value in Each Row	Java	4ms	91.17%
Design HashMap	Java	32ms	39.02%
Design HashSet	Java	12ms	97.83%
Design Neighbor Sum Service	Java	15ms	96.61%
Design Parking System	Java	7ms	100%
Design an Ordered Stream	Java	76ms	99.56%
Destination City	Java	2ms	100%
Detect Capital	Java	0ms	100%
Detect Pattern of Length M Repeated K or More Times	Java	0ms	100%
Determine Color of a Chessboard Square	Java	0ms	100%
Determine Whether Matrix Can Be Obtained By Rotation	Java	0ms	100%
Determine if String Halves Are Alike	Java	1ms	99.74%
Determine if Two Events Have Conflict	Java	0ms	100%
Determine the Winner of a Bowling Game	Java	1ms	100%
Diameter of Binary Tree	Java	0ms	100%
Difference Between Element Sum and Digit Sum of an Array	Java	2ms	98.35%
Distance Between Bus Stops	Java	0ms	100%
Distribute Candies	Java	31ms	55.24%
Distribute Candies Among Children I	Java	12ms	32.40%
Distribute Candies to People	Java	1ms	97.73%
Distribute Elements Into Two Arrays I	Java	1ms	100%
Divide Array Into Equal Pairs	Java	1ms	99.99%
Divide a String Into Groups of Size K	Java	0ms	100%
Divisible and Non-divisible Sums Difference	Java	0ms	100%
Duplicate Emails	SQL	865ms	11.83%
Duplicate Zeros	Java	3ms	44.61%
Earliest Time to Finish One Task	Java	0ms	100%
Element Appearing More Than 25% In Sorted Array	Java	0ms	100%
Employee Bonus	SQL	1659ms	64.38%
Employees Earning More Than Their Managers	SQL	1429ms	10.98%
Equal Score Substrings	Java	1ms	100%
Evaluate Boolean Binary Tree	Java	0ms	100%
Existence of a Substring in a String and Its Reverse	Java	1ms	100%
Fair Candy Swap	Java	3ms	99.76%
Faulty Keyboard	Java	3ms	98.26%
Fibonacci Number	Java	0ms	100%
Fill Square Submatrix Vertically	Java	1ms	58.12%
Final Prices With a Special Discount in a Shop	Java	2ms	65.61%
Final Value of Variable After Performing Operations	Java	1ms	74.56%
Find All K-Distant Indices in an Array	Java	28ms	22.21%
Find All Numbers Disappeared in an Array	Java	3ms	99.85%
Find Center of Star Graph	Java	3ms	34.14%
Find Champion I	Java	2ms	12.79%
Find Closest Number to Zero	Java	2ms	85.15%
Find Closest Person	Java	0ms	100%
Find Common Characters	Java	2ms	91.04%
Find Common Elements Between Two Arrays	Java	1ms	100%
Find First Palindromic String in the Array	Java	1ms	100%
Find Greatest Common Divisor of Array	Java	0ms	100%
Find Indices With Index and Value Difference I	Java	1ms	99.01%
Find Indices of Stable Mountains	Java	1ms	100%
Find Lucky Integer in an Array	Java	1ms	100%
Find Maximum Number of String Pairs	Java	2ms	90.55%
Find Minimum Operations to Make All Elements Divisible by Three	Java	0ms	100%
Find Missing Elements	Java	1ms	100%
Find Missing and Repeated Values	Java	1ms	100%
Find Mode in Binary Search Tree	Java	6ms	43.24%
Find Most Frequent Vowel and Consonant	Java	1ms	100%
Find N Unique Integers Sum up to Zero	Java	0ms	100%
Find Nearest Point That Has the Same X Or Y Coordinate	Java	2ms	100%
Find Numbers with Even Number of Digits	Java	1ms	98.93%
Find Pivot Index	Java	1ms	94.56%
Find Resultant Array After Removing Anagrams	Java	1ms	100%
Find Smallest Letter Greater Than Target	Java	0ms	100%
Find Special Substring of Length K	Java	1ms	97.39%
Find Subarrays With Equal Sum	Java	1ms	99.86%
Find Subsequence of Length K With the Largest Sum	Java	8ms	62.37%
Find Target Indices After Sorting Array	Java	0ms	100%
Find The Least Frequent Digit	Java	1ms	97.93%
Find Valid Pair of Adjacent Digits in String	Java	1ms	100%
Find Winner on a Tic Tac Toe Game	Java	0ms	100%
Find Words Containing Character	Java	1ms	100%
Find Words That Can Be Formed by Characters	Java	5ms	87.08%
Find X-Sum of All K-Long Subarrays I	Java	7ms	96.27%
Find a Corresponding Node of a Binary Tree in a Clone of That Tree	Java	1ms	98.35%
Find if Digit Game Can Be Won	Java	0ms	100%
Find if Path Exists in Graph	Java	53ms	88.29%
Find the Array Concatenation Value	Java	1ms	96.03%
Find the Child Who Has the Ball After K Seconds	Java	0ms	100%
Find the Difference	Java	1ms	99.40%
Find the Difference of Two Arrays	Java	2ms	99.85%
Find the Distance Value Between Two Arrays	Java	4ms	59.73%
Find the Distinct Difference Array	Java	5ms	93.20%
Find the Encrypted String	Java	1ms	100%
Find the Highest Altitude	Java	0ms	100%
Find the Index of the First Occurrence in a String	Java	0ms	100%
Find the Integer Added to Array I	Java	0ms	100%
Find the K-Beauty of a Number	Java	1ms	40.75%
Find the K-or of an Array	Java	6ms	13.61%
Find the K-th Character in String Game I	Java	4ms	56.59%
Find the Key of the Numbers	Java	1ms	94.40%
Find the Largest Almost Missing Integer	Java	1ms	100%
Find the Longest Balanced Substring of a Binary String	Java	1ms	100%
Find the Losers of the Circular Game	Java	1ms	100%
Find the Maximum Achievable Number	Java	1ms	100%
Find the Maximum Divisibility Score	Java	175ms	95.38%
Find the Middle Index in Array	Java	0ms	100%
Find the Number of Good Pairs I	Java	1ms	100%
Find the Number of Winning Players	Java	1ms	100%
Find the Peaks	Java	1ms	100%
Find the Pivot Integer	Java	1ms	70.60%
Find the Sum of Encrypted Integers	Java	1ms	100%
Find the Town Judge	Java	2ms	100%
Find the Width of Columns of a Grid	Java	2ms	97.87%
Find the Winning Player in Coin Game	Java	0ms	100%
Find the XOR of Numbers Which Appear Twice	Java	1ms	98.52%
Finding 3-Digit Even Number	Java	3ms	94.61%
First Bad Version	Java	24ms	98.13%
First Letter to Appear Twice	Java	0ms	100%
First Unique Character in a String	Java	5ms	94.83%
FizzBuzz	Java	1ms	99.69%
Flipping an Image	Java	0ms	100%
Form Smallest Number From Two Digit Arrays	Java	1ms	85.14%
Fruits into Baskets II	Java	1ms	100%
GCD of Odd and Even Sums	Java	0ms	100%
Generate Tag for Video Caption	Java	9ms	62.01%
Generate a String With Characters That Have Odd Counts	Java	1ms	83.40%
Get Maximum in Generated Array	Java	0ms	100%
Goal Parser Interpretation	Java	0ms	100%
Goat Latin	Java	1ms	99.87%
Greatest Common Divisor of Strings	Java	0ms	100%
Greatest English Letter in Upper and Lower Case	Java	4ms	72.30%
Guess Number Higher or Lower	Java	0ms	100%
Hamming Distance	Java	0ms	100%
Happy Number	Java	0ms	100%
Harshad Number	Java	0ms	100%
Height Checker	Java	2ms	88.86%
How Many Numbers Are Smaller Than the Current Number	Java	1ms	99.26%
Implement Queue Using Stacks	Java	0ms	100%
Implement Stack Using Queues	Java	0ms	100%
Increasing Decreasing String	Java	2ms	100%
Increasing Order Search Tree	Java	0ms	100%
Intersection of Multiple Arrays	Java	2ms	100%
Intersection of Two Arrays	Java	0ms	100%
Intersection of Two Arrays II	Java	0ms	100%
Intersection of Two Linked Lists	Java	1ms	99.90%
Invert Binary Tree	Java	0ms	100%
Is Subsequence	Java	1ms	92.35%
Isomorphic Strings	Java	13ms	52.01%
Jewels and Stones	Java	1ms	60.50%
K Items With the Maximum Sum	Java	1ms	89.54%
Keep Multiplying Found Values by Two	Java	0ms	100%
Keyboard Row	Java	0ms	100%
Kids With the Greatest Number of Candies	Java	1ms	87.73%
Kth Distinct String in an Array	Java	6ms	86.06%
Kth Largest Element in a Stream	Java	21ms	53.45%
Kth Missing Positive Number	Java	2ms	11.57%
Largest 3-Same-Digit Number in String	Java	2ms	83.21%
Largest Even Number	Java	0ms	100%
Largest Local Values in a Matrix	Java	2ms	100%
Largest Number After Digit Swaps by Parity	Java	0ms	100%
Largest Number At Least Twice of Others	Java	0ms	100%
Largest Odd Number in String	Java	1ms	99.71%
Largest Perimeter Triangle	Java	38ms	6.78%
Largest Positive Integer That Exists With Its Negative	Java	6ms	61.28%
Largest Substring Between Two Equal Characters	Java	1ms	86.43%
Largest Triangle Area	Java	4ms	99.15%
Last Stone Weight	Java	1ms	97.76%
Last Visited Integers	Java	1ms	100%
Leaf-Similar Trees	Java	0ms	100%
Left and Right Sum Differences	Java	2ms	99.10%
Lemonade Change	Java	2ms	93.83%
Length of Last Word	Java	0ms	100%
Lexicographically Smallest Palindrome	Java	5ms	100%
Lexicographically Smallest String After a Swap	Java	2ms	32.43%
License Key Formatting	Java	11ms	79.25%
Linked List Cycle	Java	0ms	100%
Long Pressed Name	Java	1ms	82.56%
Longer Contiguous Segments of Ones than Zeros	Java	0ms	100%
Longest Alternating Subarray	Java	1ms	100%
Longest Common Prefix	Java	1ms	64%
Longest Continuous Increasing Subsequence	Java	1ms	99.68%
Longest Even Odd Subarray With Threshold	Java	4ms	98.16%
Longest Harmonious Subsequence	Java	16ms	56.21%
Longest Nice Substring	Java	37ms	17.29%
Longest Palindrome	Java	7ms	52.78%
Longest Strictly Increasing or Strictly Decreasing Subarray	Java	1ms	90.29%
Longest Subsequence With Limited Sum	Java	7ms	22.61%
Longest Uncommon Subsequence I	Java	0ms	100%
Longest Unequal Adjacent Groups Subsequence I	Java	1ms	92.54%
Lucky Numbers in a Matrix	Java	3ms	46.62%
Majority Element	Java	2ms	99.80%
Majority Frequency Characters	Java	1ms	100%
Make Array Zero by Subtracting Equal Amounts	Java	0ms	100%
Make The String Great	Java	3ms	62.40%
Make Three Strings Equal	Java	1ms	100%
Make Two Arrays Equal by Reversing Subarrays	Java	1ms	99.44%
Make a Square with the Same Color	Java	0ms	100%
Matrix Cells in Distance Order	Java	13ms	66.60%
Matrix Diagonal Sum	Java	0ms	100%
Matrix Similarity After Cyclic Shifts	Java	1ms	97.69%
Max Consecutive Ones	Java	2ms	93.86%
Max Pair Sum in an Array	Java	3ms	93.95%
Maximize Expression of Three Elements	Java	1ms	99.82%
Maximize Sum Of Array After K Negations	Java	1ms	100%
Maximize Sum of At Most K Distinct Elements	Java	7ms	69.64%
Maximum 69 Number	Java	0ms	100%
Maximum Area of Longest Diagonal Rectangle	Java	1ms	91.72%
Maximum Ascending Subarray Sum	Java	0ms	100%
Maximum Average Subarray I	Java	5ms	51.11%
Maximum Containers on a Ship	Java	0ms	100%
Maximum Count of Positive Integer and Negative Integer	Java	0ms	100%
Maximum Depth of Binary Tree	Java	0ms	100%
Maximum Depth of N-Ary Tree	Java	0ms	100%
Maximum Difference Between Adjacent Elements in a Circular Array	Java	1ms	99.43%
Maximum Difference Between Even and Odd Frequency I	Java	1ms	100%
Maximum Difference Between Increasing Elements	Java	0ms	100%
Maximum Height of a Triangle	Java	0ms	100%
Maximum Length Substring With Two Occurrences	Java	38ms	5.28%
Maximum Nesting Depth of the Parentheses	Java	0ms	100%
Maximum Number of Balloons	Java	2ms	92.98%
Maximum Number of Balls in a Box	Java	13ms	97.88%
Maximum Number of Operations With the Same Score I	Java	0ms	100%
Maximum Number of Pairs in Array	Java	0ms	100%
Maximum Number of Words Found in Sentences	Java	3ms	83.48%
Maximum Number of Words You Can Type	Java	1ms	108%
Maximum Odd Binary Number	Java	1ms	100%
Maximum Population Year	Java	2ms	26.45%
Maximum Product Difference Between Two Pairs	Java	2ms	98.79%
Maximum Product of Three Numbers	Java	2ms	99.10%
Maximum Product of Two Digits	Java	1ms	95.36%
Maximum Product of Two Elements in an Array	Java	0ms	100%
Maximum Repeating Substring	Java	0ms	100%
Maximum Score After Splitting a String	Java	2ms	38.65%
Maximum Strong Pair XOR I	Java	2ms	97.49%
Maximum Subarray With Equal Products	Java	4ms	16.89%
Maximum Sum With Exactly K Elements	Java	1ms	100%
Maximum Unique Subarray Sum After Deletion	Java	1ms	99.89%
Maximum Units on a Truck	Java	8ms	95.90%
Maximum Value of a String in an Array	Java	0ms	100%
Maximum Value of an Ordered Triplet I	Java	3ms	40.06%
Mean of Array After Removing Some Elements	Java	3ms	97.86%
Merge Similar Items	Java	3ms	98.07%
Merge Sorted Array	Java	0ms	100%
Merge Strings Alternately	Java	1ms	82.95%
Merge Two 2D Arrays by Summing Values	Java	1ms	84.70%
Merge Two Binary Trees	Java	0ms	100%
Merge Two Sorted Lists	Java	0ms	100%
Middle of the Linked List	Java	0ms	100%
Min Cost Climbing Stairs	Java	0ms	100%
Min Max Game	Java	1ms	64.55%
Minimize String Length	Java	3ms	100%
Minimum Absolute Difference	Java	20ms	97.68%
Minimum Absolute Difference in BST	Java	0ms	100%
Minimum Amount of Time to Fill Cups	Java	3ms	11.87%
Minimum Average of Smallest and Largest Elements	Java	2ms	97.31%
Minimum Bit Flips to Convert Number	Java	0ms	100%
Minimum Changes To Make Alternating Binary String	Java	3ms	92.43%
Minimum Common Value	Java	2ms	86.22%
Minimum Cost of Buying Candies With Discount	Java	2ms	98.80%
Minimum Cost to Reach Every Position	Java	1ms	96.63%
Minimum Deletions for At Most K Distinct Characters	Java	2ms	97.55%
Minimum Depth of Binary Tree	Java	2ms	89.35%
Minimum Difference Between Highest and Lowest of K Scores	Java	8ms	89.22%
Minimum Distance Between BST Nodes	Java	0ms	100%
Minimum Distance Between Three Equal Elements I	Java	1ms	100%
Minimum Distance to the Target Element	Java	0ms	100%
Minimum Element After Replacement With Digit Sum	Java	1ms	100%
Minimum Index Sum of Two Lists	Java	8ms	95.80%
Minimum Moves to Convert String	Java	1ms	71.27%
Minimum Moves to Equal Array Elements III	Java	1ms	98.80%
Minimum Number Game	Java	3ms	41.37%
Minimum Number of Chairs in a Waiting Room	Java	1ms	100%
Minimum Number of Flips to Reverse Binary String	Java	1ms	99.99%
Minimum Number of Moves to Seat Everyone	Java	1ms	100%
Minimum Number of Operations to Make Elements in Array Distinct	Java	1ms	95.72%
Minimum Operations to Collect Elements	Java	1ms	99.04%
Minimum Operations to Equalize Array	Java	0ms	100%
Minimum Operations to Exceed Threshold Value I	Java	0ms	100%
Minimum Operations to Make Array Sum Divisible by K	Java	1ms	92.04%
Minimum Operations to Make Array Values Equal to K	Java	1ms	100%
Minimum Operations to Make Columns Strictly Increasing	Java	1ms	100%
Minimum Operations to Make the Array Increasing	Java	3ms	87.17%
Minimum Pair Removal to Sort Array I	Java	2ms	79.90%
Minimum Positive Sum Subarray	Java	3ms	74.01%
Minimum Recolors to Get K Consecutive Black Blocks	Java	0ms	100%
Minimum Right Shifts to Sort the Array	Java	1ms	100%
Minimum String Length After Removing Substrings	Java	5ms	56.70%
Minimum Subsequence in Non-Increasing Order	Java	2ms	98.90%
Minimum Sum of Four Digit Number After Splitting Digits	Java	0ms	100%
Minimum Sum of Mountain Triplets I	Java	1ms	100%
Minimum Time to Type Words Using Special Typewriter	Java	0ms	100%
Mirror Distance of an Integer	Java	1ms	99.89%
Missing Number	Java	0ms	100%
Modify the Matrix	Java	1ms	100%
Monotonic Stack	Java	1ms	98.82%
Most Common Word	Java	17ms	43.61%
Most Frequent Even Element	Java	7ms	98.34%
Most Frequent Number Following Key In an Array	Java	1ms	100%
Move Zeroes	Java	1ms	99.74%
N-Ary Tree Postorder Traversal	Java	0ms	100%
N-Ary Tree Preorder Traversal	Java	0ms	100%
N-Repeated Element in Size 2N Array	Java	0ms	100%
N-th Tribonacci Number	Java	0ms	100%
Neither Minimum nor Maximum	Java	4ms	99.50%
Next Greater Element I	Java	3ms	92.50%
Not Boring Movies	SQL	495ms	47.80%
Number Complement	Java	0ms	100%
Number of 1 Bits	Java	0ms	100%
Number of Arithmetic Triplets	Java	17ms	33.88%
Number of Beautiful Pairs	Java	18ms	52.42%
Number of Bit Changes to Make Two Integers Equal	Java	2ms	10.05%
Number of Changing Keys	Java	1ms	100%
Number of Common Factors	Java	1ms	44.28%
Number of Different Integers in a String	Java	3ms	78.75%
Number of Distinct Averages	Java	1ms	99.35%
Number of Employees Who Met the Target	Java	0ms	100%
Number of Equivalent Domino Pairs	Java	3ms	82.93%
Number of Even and Odd Bits	Java	2ms	23.78%
Number of Good Pairs	Java	0ms	100%
Number of Lines to Write String	Java	0ms	100%
Number of Segments in a String	Java	1ms	44.98%
Number of Senior Citizens	Java	0ms	100%
Number of Steps to Reduce a Number to Zero	Java	0ms	100%
Number of Strings That Appear as Substrings in Word	Java	0ms	100%
Number of Students Doing Homework at a Given Time	Java	0ms	100%
Number of Students Unable to Eat Lunch	Java	0ms	100%
Number of Unequal Triplets in Array	Java	5ms	85.76%
Number of Valid Words in a Sentence	Java	8ms	76.44%
Occurrences After Bigram	Java	0ms	100%
Odd String Difference	Java	2ms	59.44%
Palindrome Linked List	Java	4ms	83.80%
Palindrome Number	Java	4ms	100%
Partition Array Into Three Equal Parts With Equal Sum	Java	1ms	100%
Pascal's Triangle	Java	0ms	100%
Pascal's Triangle II	Java	1ms	66.61%
Pass the Pillow	Java	0ms	100%
Path Crossing	Java	1ms	99.70%
Path Sum	Java	0ms	100%
Patients With a Condition	SQL	386ms	29.66%
Percentage of Letter in String	Java	0ms	100%
Perfect Number	Java	2ms	83.64%
Permutation Difference between Two Strings	Java	1ms	100%
Plus One	Java	0ms	100%
Points That Intersect With Cars	Java	2ms	74.65%
Positions of Large Groups	Java	1ms	100%
Power of Four	Java	0ms	100%
Power of Three	Java	7ms	100%
Power of Two	Java	0ms	100%
Prime Arrangements	Java	1ms	38.17%
Prime Number of Set Bits in Binary Representation	Java	3ms	91.82%
Prime in Diagonal	Java	7ms	33.07%
Product Sales Analysis I	SQL	1896ms	83.84%
Project Employees I	SQL	1032ms	62.20%
Range Addition II	Java	0ms	100%
Range Sum Query - Immutable	Java	7ms	100%
Range Sum of BST	Java	0ms	100%
Rank Transform of an Array	Java	25ms	86.01%
Ransom Note	Java	1ms	99.14%
Rearrange Characters to Make Target String	Java	0ms	100%
Rearrange Spaces Between Words	Java	2ms	75.99%
Recyclable and Low Fat Products	SQL	501ms	52.32%
Redistribute Characters to Make All Strings Equal	Java	2ms	94.26%
Reformat Date	Java	1ms	97.59%
Reformat Phone Number	Java	1ms	100%
Reformat the String	Java	4ms	76.42%
Relative Ranks	Java	9ms	61.66%
Relative Sort Array	Java	0ms	100%
Remove All Adjacent Duplicates In String	Java	36ms	48.71%
Remove Digit From Number to Maximize Result	Java	2ms	72.81%
Remove Duplicates from Sorted Array	Java	0ms	100%
Remove Duplicates from Sorted List	Java	0ms	100%
Remove Element	Java	0ms	100%
Remove Letter To Equalize Frequency	Java	1ms	49.79%
Remove Linked List Elements	Java	1ms	94%
Remove One Element to Make the Array Strictly Increasing	Java	76ms	5.17%
Remove Outermost Parentheses	Java	4ms	57.35%
Remove Trailing Zeros From a String	Java	1ms	100%
Remove Zeros in Decimal Representation	Java	1ms	98.59%
Repeated Substring Pattern	Java	74ms	56.66%
Replace All ?'s to Avoid Consecutive Repeating Characters	Java	1ms	100%
Replace All Digits with Characters	Java	0ms	100%
Replace Elements with Greatest Element on Right Side	Java	3ms	58.23%
Reshape the Matrix	Java	0ms	100%
Restore Finishing Order	Java	1ms	100%
Reverse Bits	Java	3ms	10.46%
Reverse Degree of a String	Java	1ms	100%
Reverse Letters Then Special Characters in a String	Java	4ms	32.75%
Reverse Linked List	Java	0ms	100%
Reverse Only Letters	Java	0ms	100%
Reverse Prefix of Word	Java	1ms	52.92%
Reverse String	Java	0ms	100%
Reverse String II	Java	1ms	80.89%
Reverse String Prefix	Java	1ms	99.94%
Reverse Vowels of a String	Java	4ms	50.91%
Reverse Words in a String III	Java	4ms	86.63%
Richest Customer Wealth	Java	0ms	100%
Rings and Rods	Java	0ms	100%
Robot Return to Origin	Java	2ms	100%
Root Equals Sum of Children	Java	0ms	100%
Rotate String	Java	0ms	100%
Row With Maximum Ones	Java	1ms	100%
Running Sum of 1d Array	Java	0ms	100%
Same Tree	Java	0ms	100%
Score of a String	Java	1ms	99.49%
Search Insert Position	Java	0ms	100%
Search in a Binary Search Tree	Java	0ms	100%
Second Largest Digit in a String	Java	0ms	100%
Second Minimum Node In a Binary Tree	Java	0ms	100%
Self Dividing Numbers	Java	1ms	100%
Semi-Ordered Permutation	Java	1ms	100%
Separate the Digits in an Array	Java	5ms	74.92%
Set Mismatch	Java	2ms	95.73%
Shift 2D Grid	Java	12ms	8.53%
Shortest Completing Word	Java	4ms	81.11%
Shortest Distance Target String in a Circular Array	Java	0ms	100%
Shortest Distance to a Character	Java	1ms	98.82%
Shortest Subarray With OR at Least K I	Java	1ms	96.86%
Shuffle String	Java	0ms	100%
Shuffle the Array	Java	0ms	100%
Sign of the Product of an Array	Java	0ms	100%
Single Number	Java	1ms	99.93%
Slowest Key	Java	1ms	99.66%
Smallest Absent Positive Greater Than Average	Java	2ms	100%
Smallest Divisible Digit Product I	Java	1ms	65.70%
Smallest Even Multiple	Java	0ms	100%
Smallest Index With Digit Sum Equal to Index	Java	1ms	99.99%
Smallest Index With Equal Value	Java	0ms	100%
Smallest Missing Integer Greater Than Sequential Prefix Sum	Java	1ms	92.66%
Smallest Missing Multiple of K	Java	0ms	100%
Smallest Number With All Set Bits	Java	1ms	30.35%
Snake in Matrix	Java	2ms	91.68%
Sort Array By Parity	Java	0ms	100%
Sort Array By Parity II	Java	2ms	99.96%
Sort Array by Increasing Frequency	Java	4ms	98.04%
Sort Even and Odd Indices Independently	Java	4ms	52.74%
Sort Integers by Binary Reflection	Java	12ms	73.27%
Sort Integers by The Number of 1 Bits	Java	8ms	61.40%
Sort the People	Java	4ms	97.69%
Sorting the Sentence	Java	0ms	100%
Special Array I	Java	0ms	100%
Special Positions in a Binary Matrix	Java	2ms	83.84%
Split Strings by Separator	Java	6ms	84.62%
Split With Minimum Sum	Java	0ms	100%
Split a String in Balanced Strings	Java	0ms	100%
Split the Array	Java	0ms	100%
Sqrt(x)	Java	1ms	86%
Squares of a Sorted Array	Java	1ms	100%
Stone Removal Game	Java	0ms	100%
String Matching in an Array	Java	4ms	89.02%
Strong Password Checker II	Java	1ms	67.43%
Student Attendance Record I	Java	0ms	100%
Subarrays Distinct Element Sum of Squares I	Java	3ms	98.91%
Substring Matching Pattern	Java	2ms	48.35%
Substrings of Size Three with Distinct Characters	Java	0ms	100%
Subtract the Product and Sum of Digits of an Integer	Java	0ms	100%
Subtree of Another Tree	Java	2ms	97.86%
Sum Multiples	Java	3ms	63.36%
Sum of All Odd Length Subarrays	Java	2ms	66.79%
Sum of All Subset XOR Totals	Java	6ms	17.81%
Sum of Digits in Base K	Java	0ms	100%
Sum of Digits of String After Convert	Java	0ms	100%
Sum of Elements With Frequency Divisible by K	Java	1ms	99.96%
Sum of Good Numbers	Java	1ms	100%
Sum of Left Leaves	Java	0ms	100%
Sum of Root To Leaf Binary Numbers	Java	0ms	100%
Sum of Squares of Special Elements	Java	1ms	100%
Sum of Unique Elements	Java	0ms	100%
Sum of Values at Indices With K Set Bits	Java	1ms	100%
Sum of Variable Length Subarrays	Java	1ms	98.79%
Summary Ranges	Java	5ms	80.55%
Swap Sex of Employees	SQL	218ms	88.25%
Symmetric Tree	Java	0ms	100%
Take Gifts From the Richest Pile	Java	6ms	52.37%
Teemo Attacking	Java	3ms	83.20%
The Employee That Worked on the Longest Task	Java	1ms	100%
The K Weakest Rows in a Matrix	Java	2ms	76.03%
The Latest Login in 2020	SQL	695ms	17.09%
The Two Sneaky Numbers of Digitville	Java	1ms	100%
Third Maximum Number	Java	1ms	97.13%
Thousand Separator	Java	0ms	100%
Three Consecutive Odds	Java	0ms	100%
Three Divisors	Java	1ms	61.86%
Time Needed to Buy Tickets	Java	0ms	100%
To Lower Case	Java	0ms	100%
Toeplitz Matrix	Java	0ms	100%
Toggle Light Bulbs	Java	2ms	99.98%
Transform Array by Parity	Java	1ms	100%
Transformed Array	Java	1ms	96.44%
Transpose Matrix	Java	0ms	100%
Trionic Array I	Java	0ms	100%
Truncate Sentence	Java	1ms	79.33%
Two Furthest Houses With Different Colors	Java	2ms	50.45%
Two Out of Three	Java	1ms	100%
Two Sum	Java	2ms	98.93%
Two Sum IV - Input is a BST	Java	1ms	96.19%
Type of Triangle	Java	1ms	39.67%
Ugly Number	Java	0ms	100%
Uncommon Words from Two Sentences	Java	3ms	50.44%
Unique 3-Digit Even Numbers	Java	7ms	17.93%
Unique Email Addresses	Java	5ms	99.15%
Unique Morse Code Words	Java	1ms	100%
Unique Number of Occurrences	Java	2ms	97.94%
Univalued Binary Tree	Java	0ms	100%
Valid Anagram	Java	1ms	99.65%
Valid Boomerang	Java	0ms	100%
Valid Mountain Array	Java	2ms	71.67%
Valid Palindrome	Java	2ms	99.13%
Valid Palindrome II	Java	4ms	99.71%
Valid Parentheses	Java	2ms	97.66%
Valid Perfect Square	Java	0ms	100%
Valid Word	Java	1ms	99.05%
Verifying an Alien Dictionary	Java	0ms	100%
Vowel-Consonant Score	Java	1ms	99.82%
Water Bottles	Java	0ms	100%
Weighted Word Mapping	Java	2ms	97.44%
Word Pattern	Java	1ms	82.52%
X of a Kind in a Deck of Cards	Java	2ms	97.02%
XOR Operation in an Array	Java	0ms	100%
Zigzag Grid Traversal With Skip	Java	1ms	100%

Medium

Question	Submission	Runtime	Rank
3Sum	Java	30ms	84.37%
Add Minimum Number of Rungs	Java	1ms	100%
Add Two Numbers	Java	1ms	100%
Add Two Numbers II	Java	3ms	39.24%
Adding Spaces to a String	Java	11ms	98.01%
All Elements in Two Binary Search Trees	Java	16ms	88.19%
All Paths From Source to Target	Java	1ms	100%
Arithmetic Slices	Java	0ms	100%
Balance a Binary Search Tree	Java	2ms	95.99%
Beautiful Arrangement	Java	39ms	69.34%
Beautiful Array	Java	0ms	100%
Binary Search Tree Iterator	Java	16ms	99.65%
Binary Search Tree to Greater Sum Tree	Java	0ms	100%
Binary String With Substrings Representing 1 to N	Java	0ms	100%
Binary Tree Level Order Traversal	Java	1ms	89.68%
Binary Tree Level Order Traversal II	Java	1ms	93.85%
Binary Tree Right Side View	Java	1ms	71.44%
Binary Tree ZigZag Level Order Traversal	Java	1ms	69.75%
Boats to Save People	Java	6ms	98.19%
Broken Calculator	Java	0ms	100%
Build an Array With Stack Operations	Java	0ms	100%
Bulls and Cows	Java	1ms	100%
Calculate Score After Performing Instructions	Java	1ms	100%
Capacity To Ship Packages Within D Days	Java	11ms	69.45%
Check Completeness of a Binary Tree	Java	0ms	100%
Check If Array Pairs Are Divisible by k	Java	2ms	99.45%
Check If a String Contains All Binary Codes of Size K	Java	138ms	67.85%
Check if Number is a Sum of Powers of Three	Java	0ms	100%
Clone Graph	Java	24ms	96.59%
Closest Divisors	Java	6ms	87.97%
Closest Nodes Queries in a Binary Search Tree	Java	64ms	80.61%
Closest Prime Numbers in Range	Java	91ms	56.31%
Coin Change	Java	24ms	31.86%
Coin Change II	Java	7ms	71.94%
Combination Sum	Java	1ms	99.89%
Combination Sum II	Java	2ms	99.59%
Combination Sum III	Java	0ms	100%
Combination Sum IV	Java	1ms	71.15%
Combinations	Java	17ms	86.97%
Compare Strings by Frequency of the Smallest Character	Java	810ms	7.09%
Compare Version Numbers	Java	0ms	100%
Complete Prime Number	Java	2ms	92.81%
Construct Binary Search Tree from Preorder Traversal	Java	0ms	100%
Construct Binary Tree from Preorder and Inorder Traversal	Java	1ms	95.87%
Container With Most Water	Java	5ms	74.40%
Continuous Subarray Sum	Java	24ms	67.47%
Convert BST to Greater Tree	Java	1ms	17.79%
Convert Sorted List to Binary Search Tree	Java	0ms	100%
Convert an Array Into a 2D Array With Conditions	Java	1ms	100%
Count Alternating Subarrays	Java	3ms	95.26%
Count Beautiful Substrings I	Java	51ms	81.88%
Count Complete Subarrays in an Array	Java	24ms	39.10%
Count Days Without Meetings	Java	37ms	86.60%
Count Elements With at Least K Greater Values	Java	43ms	53.25%
Count Good Nodes in Binary Tree	Java	1ms	100%
Count Nice Pairs in an Array	Java	31ms	92.75%
Count Number of Bad Pairs	Java	45ms	23.08%
Count Number of Distinct Integers After Reverse Operations	Java	33ms	98.46%
Count Number of Homogenous Substrings	Java	11ms	55.99%
Count Number of Nice Subarrays	Java	7ms	95.59%
Count Number of Teams	Java	15ms	87.60%
Count Pairs That Form a Complete Day II	Java	3ms	100%
Count Primes	Java	94ms	82.87%
Count Sorted Vowel Strings	Java	259ms	6.63%
Count Subarrays With Majority Element I	Java	34ms	79.83%
Count Substrings Starting and Ending with Given Character	Java	1ms	100%
Count Substrings With K-Frequency Characters I	Java	39ms	31.92%
Count Unhappy Friends	Java	2ms	95.12%
Count of Substrings Containing Every Vowel and K Consonants I	Java	8ms	61.03%
Count the Number of Special Characters II	Java	35ms	49.81%
Custom Sort String	Java	4ms	22.05%
Daily Temperatures	Java	77ms	26.55%
Deepest Leaves Sum	Java	1ms	100%
Delete Node in a BST	Java	0ms	100%
Delete Node in a Linked List	Java	0ms	100%
Delete Nodes From Linked List Present in Array	Java	4ms	95.87%
Delete the Middle Node of a Linked List	Java	3ms	99.75%
Design Add and Search Words Data Structure	Java	162ms	94.15%
Design Browser History	Java	69ms	15.58%
Design Circular Deque	Java	5ms	86.24%
Design Circular Queue	Java	4ms	100%
Design Front Middle Back Queue	Java	8ms	34.76%
Design Linked List	Java	6ms	99.03%
Design a Food Rating System	Java	337ms	7.16%
Design a Number Container System	Java	70ms	90.71%
Design a Stack With Increment Operation	Java	5ms	91.76%
Diagonal Traverse	Java	7ms	25.66%
Diagonal Traverse II	Java	16ms	99.60%
Difference Between Ones and Zeros in Row and Column	Java	9ms	78.44%
Distant Barcodes	Java	15ms	83.05%
Distinct Prime Factors of Product of Array	Java	127ms	9.06%
Divide Array In Sets of K Consecutive Numbers	Java	215ms	39.47%
Divide Array Into Arrays With Max Difference	Java	7ms	100%
Divide Players Into Teams of Equal Skill	Java	5ms	96.36%
Divide Two Integers	Java	4ms	5.52%
Double a Number Represented as a Linked List	Java	18ms	15.32%
Employee Importance	Java	4ms	99.25%
Elimination Game	Java	1ms	100%
Equal Row and Column Pairs	Java	12ms	88.41%
Evaluate the Bracket Pairs of a String	Java	39ms	51.16%
Even Odd Tree	Java	17ms	23.05%
Extra Characters in a String	Java	46ms	87.58%
Factorial Trailing Zeroes	Java	0ms	100%
Find All Anagrams in a String	Java	9ms	91.31%
Find All Duplicates in an Array	Java	5ms	94.05%
Find All Lonely Numbers in the Array	Java	12ms	99.88%
Find Bottom Left Tree Value	Java	0ms	100%
Find Consecutive Integers from a Data Stream	Java	26ms	68.56%
Find Eventual Safe States	Java	3ms	99.90%
Find First and Last Position of Element in Sorted Array	Java	0ms	100%
Find Good Days to Rob the Bank	Java	5ms	88.83%
Find K Closest Elements	Java	4ms	96.68%
Find Kth Bit in Nth Binary String	Java	224ms	5.41%
Find Largest Value in Each Tree Row	Java	2ms	80.79%
Find Longest Special Substring That Occurs Thrice I	Java	35ms	27.51%
Find Minimum in Rotated Sorted Array	Java	0ms	100%
Find Occurrences of an Element in an Array	Java	5ms	90.21%
Find Original Array From Doubled Array	Java	56ms	86.73%
Find Peak Element	Java	0ms	100%
Find Players With Zero or One Losses	Java	44ms	93.03%
Find Three Consecutive Integers That Sum to a Given Number	Java	0ms	100%
Find Triangular Sum of an Array	Java	40ms	97.87%
Find Unique Binary String	Java	0ms	100%
Find the Divisibility Array of a String	Java	7ms	83.98%
Find the Duplicate Number	Java	4ms	88.75%
Find the First Player to win K Games in a Row	Java	1ms	100%
Find the Kth Largest Integer in the Array	Java	16ms	95.51%
Find the Longest Semi-Repetitive Substring	Java	23ms	5.20%
Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	Java	2ms	58.72%
Find the Minimum and Maximum Number of Nodes Between Critical Points	Java	4ms	100%
Find the Most Common Response	Java	143ms	51.44%
Find the N-th Value After K Seconds	Java	196ms	78.19%
Find the Power of K-Size Subarrays I	Java	1ms	100%
Find the Power of K-Size Subarrays II	Java	3ms	100%
Find the Prefix Common Array of Two Arrays	Java	3ms	60.99%
Find the Winner of an Array Game	Java	0ms	100%
Finding Pairs With a Certain Sum	Java	153ms	42.29%
First Completely Painted Row or Column	Java	4ms	94.20%
First Element with Unique Frequency	Java	7ms	99.99%
Flatten Binary Tree to Linked List	Java	1ms	18.41%
Four Divisors	Java	17ms	56.54%
Frequency Tracker	Java	44ms	49.19%
Frequency of the Most Frequent Element	Java	11ms	99.39%
Generate Binary Strings Without Adjacent Zeros	Java	2ms	90.13%
Generate Parentheses	Java	0ms	100%
Group Anagrams	Java	7ms	65.30%
Group the People Given the Group Size They Belong To	Java	8ms	51.20%
Hand of Straights	Java	63ms	27.26%
Implement Trie (Prefix Tree)	Java	33ms	85.89%
Increasing Triplet Subsequence	Java	2ms	98.72%
Insert Delete GetRandom O(1)	Java	25ms	98.76%
Insert Greatest Common Divisors in Linked List	Java	2ms	57.29%
Insert Interval	Java	2ms	31.53%
Insert into a Binary Search Tree	Java	0ms	100%
Insertion Sort List	Java	28ms	8.25%
Invalid Transactions	Java	77ms	16.45%
Jump Game	Java	2ms	84.17%
K Closest Points to Origin	Java	30ms	64.77%
K Divisible Elements Subarrays	Java	190ms	59.09%
K-diff Pairs in an Array	Java	11ms	59.51%
K-th Smallest Prime Fraction	Java	344ms	44.26%
Kth Largest Element in an Array	Java	3ms	98.86%
Kth Largest Sum in a Binary Tree	Java	45ms	83.54%
Kth Smallest Element In A Sorted Matrix	Java	11ms	65.35%
Kth Smallest Element in a BST	Java	0ms	100%
Largest Palindromic Number	Java	10ms	80.47%
Largest Prime From Consecutive Prime Sum	Java	190ms	57.17%
Least Number of Unique Integers after K Removals	Java	38ms	93.18%
Length of Longest Fibonacci Subsequence	Java	196ms	35.02%
Length of the Longest Alphabetical Continuous Substring	Java	11ms	80.20%
Letter Case Permutation	Java	3ms	47.09%
Letter Combinations of a Phone Number	Java	0ms	100%
Lexicographically Minimum String After Removing Stars	Java	102ms	86.78%
Lexicographically Smallest String After Reverse	Java	103ms	81.76%
Linked List Components	Java	1ms	100%
Linked List Cycle II	Java	0ms	100%
Linked List Random Node	Java	9ms	100%
Longest Arithmetic Subsequence	Java	383ms	69.83%
Longest Balanced Subarray I	Java	146ms	93.80%
Longest Consecutive Sequence	Java	31ms	56.92%
Longest Increasing Subsequence	Java	38ms	64.87%
Longest Mountain in Array	Java	2ms	99.72%
Longest Palindromic Substring	Java	18ms	51.89%
Longest Square Streak in an Array	Java	36ms	95.20%
Longest Substring Of All Vowels in Order	Java	19ms	77.61%
Longest Substring Without Repeated Characters	Java	6ms	70.55%
Longest Univalue Path	Java	2ms	95.73%
Longest Word in Dictionary	Java	17ms	52.51%
Lowest Common Ancestor of a Binary Search Tree	Java	5ms	100%
Lowest Common Ancestor of a Binary Tree	Java	6ms	100%
Majority Element II	Java	12ms	38.35%
Make Number of Distinct Characters Equal	Java	13ms	39.22%
Map Sum Pairs	Java	10ms	97.30%
Masking Personal Information	Java	0ms	100%
Max Number of K-Sum Pairs	Java	24ms	45.50%
Max Sum of a Pair With Equal Sum of Digits	Java	54ms	36.20%
Maximal Score After Applying K Operations	Java	130ms	63.04%
Maximum Binary Tree	Java	1ms	100%
Maximum Consecutive Floors Without Special Floors	Java	30ms	94.41%
Maximum Difference Between Node and Ancestor	Java	0ms	100%
Maximum Distance in Arrays	Java	6ms	87.20%
Maximum Gap	Java	11ms	93.10%
Maximum Ice Cream Bars	Java	6ms	88.17%
Maximum Length of Pair Chain	Java	9ms	80.63%
Maximum Length of Repeated Subarray	Java	24ms	66.86%
Maximum Length of a Concatenated String with Unique Characters	Java	11ms	60.59%
Maximum Level Sum of a Binary Tree	Java	8ms	93.82%
Maximum Matching of Players With Trainers	Java	26ms	61.51%
Maximum Number of Occurrences of a Substring	Java	37ms	75.61%
Maximum Number of Vowels in a Substring of Given Length	Java	13ms	73.89%
Maximum Points You Can Obtain from Cards	Java	2ms	98.84%
Maximum Prime Difference	Java	0ms	100%
Maximum Product After K Increments	Java	291ms	48.57%
Maximum Product Subarray	Java	1ms	90.84%
Maximum Product of Word Lengths	Java	242ms	19.79%
Maximum Strength of a Group	Java	5ms	37.59%
Maximum Subarray	Java	1ms	99.51%
Maximum Sum With at Most K Elements	Java	245ms	26.60%
Maximum Sum of Distinct Subarrays With Length K	Java	4ms	99.46%
Maximum Sum of an Hourglass	Java	3ms	96.09%
Maximum Twin Sum of a Linked List	Java	5ms	65.21%
Merge Adjacent Equal Elements	Java	72ms	40.36%
Merge In Between Linked Lists	Java	2ms	31.02%
Merge Intervals	Java	7ms	97.71%
Merge Nodes in Between Zeros	Java	5ms	83.64%
Min Stack	Java	5ms	83.54%
Minimize Maximum Pair Sum in Array	Java	11ms	96.62%
Minimum Absolute Difference Between Mirror Pairs	Java	48ms	92.88%
Minimum Add to Make Parentheses Valid	Java	1ms	51.13%
Minimum Average Difference	Java	7ms	20%
Minimum Consecutive Cards to Pick Up	Java	16ms	96.94%
Minimum Distance Between Three Equal Elements II	Java	58ms	93.75%
Minimum Increment to Make Array Unique	Java	10ms	90.87%
Minimum Moves to Equal Array Elements II	Java	11ms	12.02%
Minimum Number of Operations to Have Distinct Elements	Java	11ms	60.49%
Minimum Number of Steps to Make Two Strings Anagram	Java	6ms	98.87%
Minimum Number of Steps to Make Two Strings Anagram II	Java	11ms	96.36%
Minimum Number of Vertices to Reach All Nodes	Java	8ms	99.23%
Minimum Operations to Exceed Threshold Value II	Java	144ms	74.64%
Minimum Operations to Half Array Sum	Java	172ms	82.34%
Minimum Operations to Make Binary Array Elements Equal to One I	Java	7ms	57.49%
Minimum Path Sum	Java	3ms	71.06%
Minimum Size Subarray Sum	Java	1ms	99.72%
Minimum Sum of Mountain Triplets II	Java	2ms	100%
Minimum Time to Make Rope Colorful	Java	11ms	24.39%
Most Frequent Subtree Sum	Java	3ms	98.36%
My Calendar I	Java	19ms	83.88%
N-Ary Tree Level Order Traversal	Java	3ms	71.32%
Next Greater Element II	Java	9ms	94.03%
Next Greater Node In Linked List	Java	16ms	92.23%
Non-decreasing Array	Java	0ms	100%
Non-decreasing Subsequences	Java	9ms	60.28%
Non-overlapping Intervals	Java	46ms	82.48%
Number of Centered Subarrays	Java	95ms	58.65%
Number of Good Ways to Split a String	Java	6ms	82.40%
Number of Matching Subsequences	Java	55ms	74.33%
Number of Pairs of Strings With Concatenation Equal to Target	Java	3ms	91.55%
Number of Provinces	Java	1ms	88.24%
Number of Smooth Descent Periods of a Stock	Java	2ms	98.50%
Number of Steps to Reduce a Number in Binary Representation to One	Java	7ms	9.84%
Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	Java	2ms	99.85%
Number of Subarrays With GCD Equal to K	Java	5ms	91.72%
Number of Subarrays With LCM Equal to K	Java	14ms	61.11%
Number of Subarrays with Bounded Maximum	Java	3ms	99.79%
Number of Substrings Containing All Three Characters	Java	15ms	42.72%
Number of Substrings With Only 1s	Java	4ms	88.42%
Number of Ways Where Square of Number Is Equal to Product of Two Numbers	Java	49ms	48.21%
Number of Zero-Filled Subarrays	Java	3ms	95.56%
Optimal Partition of String	Java	14ms	68.52%
Pair of Songs With Total Durations Divisible by 60	Java	2ms	96.88%
Palindrome Partitioning	Java	7ms	96.05%
Palindromic Substrings	Java	5ms	96.54%
Partition Array According to Given Pivot	Java	5ms	75.52%
Partition List	Java	0ms	100%
Partition String	Java	161ms	81.86%
Path Sum II	Java	1ms	99.84%
Path Sum III	Java	19ms	28.31%
Peak Index in a Mountain Array	Java	0ms	100%
People Whose List of Favourite Companies Is Not a Subset of Another List	Java	279ms	66.51%
Perfect Squares	Java	22ms	91.76%
Permutation in String	Java	6ms	86.31%
Permutations	Java	1ms	92.71%
Permutations II	Java	1ms	99.88%
Populating Next Right Pointers in Each Node	Java	3ms	35.47%
Populating Next Right Pointers in Each Node II	Java	2ms	37.45%
Pow(x, n)	Java	0ms	100%
Prime Pairs With Target Sum	Java	132ms	74.11%
Print Words Vertically	Java	1ms	80.69%
Product of Array Except Self	Java	2ms	89.32%
Product of the Last K Numbers	Java	16ms	100%
Random Pick Index	Java	58ms	99.02%
Random Pick with Weight	Java	21ms	99.89%
Range Sum of Sorted Subarray Sums	Java	18ms	83.97%
Rank Teams by Votes	Java	5ms	84.98%
Reachable Nodes With Restrictions	Java	47ms	87.43%
Rearrange Array Elements by Sign	Java	3ms	100%
Rearrange Words in a Sentence	Java	22ms	87.96%
Reconstruct Original Digits from English	Java	4ms	78.33%
Recover Binary Search Tree	Java	1ms	100%
Reduce Array Size to The Half	Java	17ms	92.02%
Reduction Operations to Make the Array Elements Equal	Java	34ms	70.37%
Remove All Adjacent Duplicates In String II	Java	31ms	52.93%
Remove Duplicate Letters	Java	2ms	94.48%
Remove Duplicates from Sorted List II	Java	0ms	100%
Remove Nodes From Linked List	Java	7ms	73.29%
Remove Nth Node From End of List	Java	0ms	100%
Remove Stones to Minimize the Total	Java	335ms	88.82%
Remove Zero Sum Consecutive Nodes from Linked List	Java	2ms	91.55%
Removing Minimum and Maximum From Array	Java	2ms	100%
Removing Stars From a String	Java	30ms	87.41%
Reorder List	Java	4ms	12.39%
Reorganize String	Java	3ms	65.10%
Repeated DNA Sequences	Java	19ms	54.02%
Repeated String Match	Java	269ms	25.27%
Replace Elements in an Array	Java	13ms	98.85%
Replace Words	Java	46ms	44.44%
Report Spam Message	Java	38ms	97.12%
Restore the Array From Adjacent Pairs	Java	99ms	66.23%
Resulting String After Adjacent Removals	Java	81ms	93.01%
Reverse Integer	Java	0ms	100%
Reverse Linked List II	Java	0ms	100%
Reverse Odd Levels of Binary Tree	Java	0ms	100%
Reverse Words With Same Vowel Count	Java	54ms	87.90%
Reverse Words in a String	Java	6ms	86.18%
Reward Top K Students	Java	65ms	86.25%
Rotate Array	Java	0ms	100%
Rotate List	Java	0ms	100%
Search Suggestions System	Java	38ms	36.75%
Search a 2D Matrix	Java	0ms	100%
Search a 2D Matrix II	Java	5ms	99.37%
Search in Rotated Sorted Array	Java	0ms	100%
Search in Rotated Sorted Array II	Java	0ms	100%
Seat Reservation Manager	Java	33ms	89.31%
Second Highest Salary	SQL	480ms	64.38%
Sender With Largest Word Count	Java	49ms	78.74%
Serialize and Deserialize BST	Java	10ms	39.11%
Set Matrix Zeroes	Java	1ms	73.86%
Shortest Unsorted Continuous Array	Java	1ms	91.16%
Shuffle an Array	Java	53ms	34.10%
Simple Bank System	Java	95ms	96.22%
Simplify Path	Java	5ms	51.87%
Single Element in a Sorted Array	Java	0ms	100%
Sliding Subarray Beauty	Java	41ms	36.53%
Smallest Number in Infinite Set	Java	16ms	33.15%
Smallest Palindromic Rearrangement I	Java	43ms	36.19%
Smallest String Starting From Leaf	Java	1ms	99.86%
Smallest Subsequence of Distinct Characters	Java	2ms	98.61%
Smallest Value After Replacing With Sum of Prime Factors	Java	0ms	100%
Smallest Value of the Rearranged Number	Java	0ms	100%
Sort Characters By Frequency	Java	8ms	87.71%
Sort Colors	Java	0ms	100%
Sort Integers by The Power Value	Java	36ms	82.14%
Sort List	Java	9ms	94.52%
Sort Matrix by Diagonals	Java	5ms	58.74%
Sort Vowels in a String	Java	74ms	27.49%
Sort an Array	Java	5ms	97.68%
Sort the Matrix Diagonally	Java	2ms	96.51%
Sort the Students by Their Kth Score	Java	2ms	94.15%
Spiral Matrix	Java	0ms	100%
Split Array by Prime Indices	Java	4ms	100%
Statistics from a Large Sample	Java	1ms	99%
Stock Price Fluctuation	Java	109ms	52.64%
Strictly Palindromic Number	Java	0ms	100%
String Without AAA or BBB	Java	0ms	100%
Subarray Product Less Than K	Java	4ms	99.98%
Subarray Sum Equals K	Java	24ms	75.04%
Subsets	Java	0ms	100%
Subsets II	Java	1ms	99.93%
Sum Root to Leaf Numbers	Java	0ms	100%
Sum in a Matrix	Java	13ms	99.35%
Sum of Absolute Differences in a Sorted Array	Java	5ms	44.72%
Sum of Beauty of All Substrings	Java	1153ms	5.02%
Sum of Even Numbers After Queries	Java	4ms	99.66%
Sum of Largest Prime Substrings	Java	22ms	36.79%
Sum of Matrix After Queries	Java	3ms	100%
Sum of Square Numbers	Java	3ms	93.35%
Sum of Two Integers	Java	0ms	100%
Super Pow	Java	32ms	5.10%
Swap Nodes in Pairs	Java	0ms	100%
Swapping Nodes in a Linked List	Java	2ms	53.34%
Top K Frequent Elements	Java	6ms	99.38%
Top K Frequent Words	Java	6ms	98%
Total Characters in String After Transformations I	Java	141ms	42.47%
Two Sum II - Input Array Is Sorted	Java	2ms	92.54%
Ugly Number II	Java	2ms	98.25%
Unique Paths	Java	0ms	100%
Unique Paths II	Java	0ms	100%
Validate Binary Search Tree	Java	2ms	98.25%
Wiggle Sort II	Java	3ms	96.79%
Word Break	Java	1ms	99.36%
Word Subsets	Java	14ms	45.41%
Zigzag Conversion	Java	4ms	86.11%

Hard

Question	Submission	Runtime	Rank
Bus Routes	Java	49ms	79.54%
Find K-th Smallest Pair Distance	Java	7ms	81.55%
Find Median from Data Stream	Java	99ms	99.71%
Find Minimum in Rotated Sorted Array II	Java	0ms	100%
Find in Mountain Array	Java	0ms	100%
First Missing Positive	Java	1ms	100%
Insert Delete GetRandom O(1) - Duplicates allowed	Java	31ms	84.09%
Make Array Empty	Java	51ms	84.31%
Merge k Sorted Lists	Java	4ms	79.14%
Minimum Window Substring	Java	14ms	70.35%
Number of Visible People in a Queue	Java	63ms	34.82%
Permutation Sequence	Java	511ms	14.28%
Random Pick with Blacklist	Java	43ms	83.32%
Reverse Nodes in k-Group	Java	1ms	30.85%
Serialize and Deserialize Binary Tree	Java	17ms	39.28%
Sliding Window Maximum	Java	7ms	99.46%
Vertical Order Traversal of a Binary Tree	Java	3ms	94.40%