/in/foo.cc: In function 'int main()':
/in/foo.cc:13:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<s.length();i++)
          ~^~~~~~~~~~~
/in/foo.cc:15:7: warning: value computed is not used [-Wunused-value]
   s[i]-'0';
        
/in/foo.cc:19:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<s.length();i++)
          ~^~~~~~~~~~~
/in/foo.cc:30:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<s.length();i++)
          ~^~~~~~~~~~~
/in/foo.cc:34:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<s.length();i++)
          ~^~~~~~~~~~~
/in/foo.cc:36:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j<s.length();j++)
               ~^~~~~~~~~~~
/in/foo.cc:49:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<s.length();i++)
          ~^~~~~~~~~~~
/in/foo.cc:54:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(cnt==s.length())
     ~~~^~~~~~~~~~~~
/in/foo.cc:59:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<s.length();i++)
          ~^~~~~~~~~~~
/in/foo.cc:9:17: warning: unused variable 'k' [-Wunused-variable]
  int i,a[10000],k=0,cnt=0;
                 ^
/in/foo.cc:10:7: warning: unused variable 'b' [-Wunused-variable]
  bool b[10000];
       ^