/in/foo.cc: In function 'int main()':
/in/foo.cc:94:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<scc[i].size();j++)
                ~^~~~~~~~~~~~~~
/in/foo.cc:99:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int k=1;k<=scc[i].size();k++)
                ~^~~~~~~~~~~~~~~