Set Matrix Zeros

Question:

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place.

Solution:

 class Solution {
 public:
     void setZeroes(vector<vector<int>>& matrix) {
     int m=matrix.size();
     int n=matrix[].size();
     vector<int> a;
     for(int i=;i<matrix.size();i++)
         for(int j=;j<matrix[i].size();j++)
             a.push_back(matrix[i][j]);
     vector<int> b(a);
     vector<int>::iterator iter=b.begin();
     for(int i=;i<a.size();i++)
     {
         if(==a[i])
         {
             for(int j=;j<n;j++)
             {
                 *(iter+(i/n)*n+j)=;
             }
             for(int k=;k<m;k++)
             {
                 *(iter+k*n+i%n)=;
             }
         }
     }
     vector< vector<int> >matrix_temp;
     vector<int> p;
     for(int i=;i<b.size();i++)
     {
         p.push_back(b[i]);
         if(i%n==n-)
         {
             matrix_temp.push_back(p);
             p.erase(p.begin(),p.end());
         }
     }
     matrix =matrix_temp;
     }
 };