foo.cc: In function 'int main()':
foo.cc:20:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<s.length();++i)
                 ~^~~~~~~~~~~
foo.cc:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<num5.size();++i){
                 ~^~~~~~~~~~~~
foo.cc:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<dis5.size();++i){
                 ~^~~~~~~~~~~~

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