Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:40:37: 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:50:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < GT[node].size(); i++) ^ user.cpp: In function ‘void Solve(int)’: user.cpp:79:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < GT[x].size(); i++) ^ user.cpp:96:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < GT[x].size(); i++) ^ user.cpp:111:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[x].size(); i++) ^