/in/foo.cc: In function 'int main()':
/in/foo.cc:8:7: error: 'n' was not declared in this scope
  cin>>n>>m;
       ^
/in/foo.cc:8:10: error: 'm' was not declared in this scope
  cin>>n>>m;
          ^
/in/foo.cc:20:7: error: 'v' was not declared in this scope
    if(v[i][j])cout<<j;
       ^