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【leetcode】 Search a 2D Matrix (easy)
Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties:
- Integers in each row are sorted from left to right.
- The first integer of each row is greater than the last integer of the previous row.
实际上就是二分搜索, 不难, 一次AC。
注意一下退出条件是 l <= r 就行。有等于。
class Solution {public: bool searchMatrix(vector<vector<int> > &matrix, int target) { if(matrix.empty()) return false; int length = matrix.size() * matrix[0].size(); int l = 0, r = length - 1; while(l <= r) //注意 这里包含等于 { int mid = (l + r) / 2; int col = mid % matrix[0].size(); int row = mid / matrix[0].size(); if(matrix[row][col] < target) { l = mid + 1; } else if(matrix[row][col] > target) { r = mid - 1; } else { return true; } } return false; }};
【leetcode】 Search a 2D Matrix (easy)
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