/in/foo.cc: In function 'int main()':
/in/foo.cc:52:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(str.length() > maxlen) {
            ~~~~~~~~~~~~~^~~~~~~~
/in/foo.cc:62:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<s.length();i++)
                     ~^~~~~~~~~~~
/in/foo.cc:63:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j=i+1;j<s.length();j++) {
                           ~^~~~~~~~~~~
/in/foo.cc:82:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int i=0;i<s.length();i++) {
                         ~^~~~~~~~~~~
/in/foo.cc:84:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 int r = s[i==s.length()-1?0:i+1]-'0';
                           ~^~~~~~~~~~~~~~
/in/foo.cc:98:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(s.length() < maxlen) {
            ~~~~~~~~~~~^~~~~~~~
/in/foo.cc:99:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int i=0;i<s.length()+1;i++) {
                         ~^~~~~~~~~~~~~
/in/foo.cc:101:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 int cur = s[i==s.length() ? 0:i] - '0';
                             ~^~~~~~~~~~~~