leetcode 378. Kth Smallest Element in a Sorted Matrix

二分的方法解决

class Solution {
public:int kthSmallest(vector<vector<int>>& matrix, int k) {int left = matrix[0][0],right = matrix.back().back();while(left < right){int mid = left + (right - left)/2;int index = search(matrix,mid);if(index < k)left = mid + 1;elseright = mid;}return left;}int search(vector<vector<int>>& matrix,int target){int i = matrix.size() - 1,j = 0,cnt = 0;while(i >= 0 && j < matrix[0].size()){if(matrix[i][j] <= target){j++;cnt += i + 1;}elsei--;}return cnt;}
};

https://www.cnblogs.com/grandyang/p/5727892.html

转载于:https://www.cnblogs.com/ymjyqsx/p/10764815.html

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