/in/foo.cc: In function 'void DP()':
/in/foo.cc:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0; i<E2[x].size(); i++) {
                      ~^~~~~~~~~~~~~
/in/foo.cc: In function 'void TARJAN(int)':
/in/foo.cc:45:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<E1[x].size(); i++) {
                  ~^~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:78:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=0; j<E1[i].size(); j++) {
                      ~^~~~~~~~~~~~~