LeetCode 74 Search a 2D Matrix
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在矩阵中找一个数。矩阵则是有规律的。
class Solution {public: bool searchMatrix(vector<vector<int>>& matrix, int target) { int mm=matrix.size(); int nn=matrix[0].size(); if(target<matrix[0][0]||(target>matrix[mm-1][nn-1]))return false; for(int ii=0;ii<mm-1;ii++){ if(matrix[ii][0]<=target&&target<matrix[ii+1][0]){ vector<int>::iterator ans=lower_bound(matrix[ii].begin(),matrix[ii].end(),target); if(ans==matrix[ii].end()||(*ans!=target))return false; else return true; } } vector<int>::iterator ans=lower_bound(matrix[mm-1].begin(),matrix[mm-1].end(),target); if(ans==matrix[mm-1].end()||(*ans!=target))return false; else return true; }};
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