/in/foo.cc: In function 'int main()':
/in/foo.cc:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<s.size();i++){
                 ~^~~~~~~~~
/in/foo.cc:32:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<paired.size();i++){
                 ~^~~~~~~~~~~~~~
/in/foo.cc:31:37: warning: unused variable 'newsub' [-Wunused-variable]
     int len=0,st=0,ed=0,fst=0,fed=0,newsub=1;
                                     ^~~~~~