C++ 2d vector assign value

vector<vector<int>> v;
   int val;
   int n = size(v);
   for(int i = 0; i < n; i++)
{
      vector<int> temp;
      for(int j = 0; j < n; j++){
         cin >> val;
      temp.push_back(val);
      }
      v.push_back(temp);
      temp.clear();

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