/in/foo.cc: In function 'int main()':
/in/foo.cc:9:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int i=1;i<=strlen(s);i++){
                    ^
/in/foo.cc:5:10: warning: unused variable 'n' [-Wunused-variable]
      int n;char s[1000];
          ^