Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:44:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘void DFS2(int)’: user.cpp:71:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < GG[node].size(); i++) ^ user.cpp:94:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘void Solve()’: user.cpp:111:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Sol.size(); i++) ^