由给的矩阵性质,我们可以从右上向左下检索,
写一个while循环,不满足条件时,即说明target不存在
class Solution(object):
def searchMatrix(self, matrix, target):
"""
:type matrix: List[List[int]]
:type target: int
:rtype: bool
"""
if not matrix:
return False
m, n = len(matrix), len(matrix[0])
r, c = 0, n - 1
while r < m and c >= 0:
if matrix[r][c] == target:
return True
if matrix[r][c] > target:
c -= 1
else:
r += 1
return False
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