[LeetCode] 73. Set Matrix Zeroes

【思路】将每一个（0,0）点坐标存入multimap中，再在遍历时将行和列清零，代码如下：

 1 class Solution
 2 {
 3 public:
 4     void setRowCol(vector<vector<int>>& matrix, multimap<int, int> Map)
 5     {
 6         multimap<int, int>::iterator iter = Map.begin();
 7         for(; iter != Map.end(); iter ++)
 8         {
 9             for(int i = 0;i < matrix.size(); i ++)
10             {
11                 matrix[i][iter->second] = 0;//列清零
12             }
13             for(int j = 0;j < matrix[0].size();j ++)
14             {
15                 matrix[iter->first][j] = 0;//行清零
16             }
17         }
18     }
19     void setZeroes(vector<vector<int>>& matrix)
20     {
21         multimap<int, int> Map;
22         for(int i = 0; i < matrix.size(); i ++)
23         {
24             for(int j = 0; j < matrix[0].size(); j ++)
25             {
26                 if(matrix[i][j] == 0)
27                 {
28                     Map.insert(pair<int, int> (i,j));
29                 }
30             }
31         }
32         setRowCol(matrix,Map);
33     }
34 };