/in/foo.cc: In function 'int main()':
/in/foo.cc:9:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++)
              ~^~~~~~~~~
/in/foo.cc:9:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=0;i<s.size();i++)
  ^~~
/in/foo.cc:11:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   cout<<endl;
   ^~~~