Compilare: main.cpp: In function 'int main()': main.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G.size();i++) ~^~~~~~~~~ main.cpp:35:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<G.size();j++) ~^~~~~~~~~ main.cpp:47:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Q.size()-1;i++) ~^~~~~~~~~~~