/in/foo.cc: In function 'void buildGroup(int, int)':
/in/foo.cc:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<arr[id].cid.size();i++) {
                 ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int ctop(int)':
/in/foo.cc:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<arr[id].pid.size();i++) {
                 ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int ptoc(int, bool*)':
/in/foo.cc:70:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<arr[id].cid.size();i++) {
                 ~^~~~~~~~~~~~~~~~~~~