leetcode-74-搜索二维矩阵

题目描述：

方法一：二分

class Solution:
    def searchMatrix(self, matrix: List[List[int]], target: int) -> bool:
        m = len(matrix)
        if m==0:
            return False
        n = len(matrix[0])
        left,right = 0,m*n-1
        while left<=right:
            mid_idx = (left+right)//2
            mid_element = matrix[mid_idx//n][mid_idx%n]
            if target == mid_element:
                return True
            else:
                if target<mid_element:
                    right = mid_idx - 1
                else:
                    left = mid_idx + 1
        return False