Compilare: user.cpp: In function ‘void solve()’: user.cpp:98:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[1].size();i++) ^ user.cpp:101:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<G[t].size();j++) ^ user.cpp:106:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=0;t<G[j].size();t++) ^ user.cpp:112:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<G[j+1].size();k++) ^