/in/foo.cc: In function 'int main()':
/in/foo.cc:48:9: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<s;
         ^
/in/foo.cc:35:11: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
   for(int j;j<=m;j++){
           ^