Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:27:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[n].size();i++) ^ user.cpp:33:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[n].size();i++) ^ user.cpp:46:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[n].size();i++) ^ user.cpp:58:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[n].size();i++) ^ user.cpp:64:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[n].size();i++) ^ user.cpp:69:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[n].size();i++) ^ user.cpp:81:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[n].size();i++) ^ user.cpp:94:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[n].size();i++) ^