/in/foo.cc: In function 'int main()':
/in/foo.cc:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int k=0;k<g[v].size();k++){
                 ~^~~~~~~~~~~~
/in/foo.cc:63:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int k=0;k<g[u].size();k++){
                 ~^~~~~~~~~~~~
/in/foo.cc:71:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int k1=0;k1<g[u].size();k1++)if(g[u][k1]<=c){
                  ~~^~~~~~~~~~~~
/in/foo.cc:72:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for(int k2=0;k2<g[v].size();k2++){
                   ~~^~~~~~~~~~~~