LeetCode 73 Set Matrix Zeroes 思维
作者:互联网
Given an m x n
integer matrix matrix
, if an element is \(0\), set its entire row and column to \(0\)'s.
You must do it in place.
Solution
做法并不难,但如果考虑常数空间复杂度的限制,我们只需要记录所在的 \(row,col\) 即可
点击查看代码
class Solution {
private:
set<int> rows;
set<int> cols;
bool check_row(set<int> rows, int r){
if(rows.find(r)!=rows.end())return true;
return false;
}
bool check_col(set<int> cols, int c){
if(cols.find(c)!=cols.end())return true;
return false;
}
public:
void setZeroes(vector<vector<int>>& matrix) {
int r = matrix.size(), c = matrix[0].size();
for(int i=0;i<r;i++){
for(int j=0;j<c;j++){
if(matrix[i][j]==0){rows.insert(i);cols.insert(j);}
}
}
for(int i=0;i<r;i++)
for(int j=0;j<c;j++){
if(check_row(rows,i)||check_col(cols,j))
matrix[i][j]=0;
}
}
};
标签:Zeroes,Set,return,Matrix,int,cols,set,rows,matrix 来源: https://www.cnblogs.com/xinyu04/p/16504251.html