/in/foo.cc: In function 'int main()':
/in/foo.cc:9:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<s.size();i++)
                 ~^~~~~~~~~
/in/foo.cc:28:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<=s.size();i++)
                 ~^~~~~~~~~~
/in/foo.cc:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<s.size();i++)
                 ~^~~~~~~~~
/in/foo.cc:64:9: warning: 'mini' may be used uninitialized in this function [-Wmaybe-uninitialized]
         if(i==mini)
         ^~
/in/foo.cc:56:9: warning: 'maxi' may be used uninitialized in this function [-Wmaybe-uninitialized]
         if(i==maxi)
         ^~