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04_FindInPartiallySortedMatrix.py
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52 lines (42 loc) · 1.34 KB
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# -*- coding: utf-8 -*-
# @File : 04_FindInPartiallySortedMatrix.py.py
# @Date : 2020-10-11
# @Author : tc
"""
剑指 Offer 04. 二维数组中的查找
在一个 n * m 的二维数组中,每一行都按照从左到右递增的顺序排序,每一列都按照从上到下递增的顺序排序。请完成一个函数,输入这样的一个二维数组和一个整数,判断数组中是否含有该整数。
示例:
现有矩阵 matrix 如下:
[
[1, 4, 7, 11, 15],
[2, 5, 8, 12, 19],
[3, 6, 9, 16, 22],
[10, 13, 14, 17, 24],
[18, 21, 23, 26, 30]
]
给定 target = 5,返回 true。
给定 target = 20,返回 false。
限制:
0 <= n <= 1000
0 <= m <= 1000
注意:本题与主站 240 题相同:https://leetcode-cn.com/problems/search-a-2d-matrix-ii/
"""
from typing import List
class Solution:
def findNumberIn2DArray(self, matrix: List[List[int]], target: int) -> bool:
rows = len(matrix)
if not rows:
return False
columns = len(matrix[0])
i = rows - 1
j = 0
while (0 <= i <= rows - 1) and (0 <= j <= columns -1):
if matrix[i][j] == target:
return True
if matrix[i][j] > target:
i -= 1
if matrix[i][j] < target:
j += 1
return False
if __name__ == '__main__':
pass