Compilare: user.cpp: In function ‘void DFS(const int&)’: user.cpp:23:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp: In function ‘bool cuplaj(const int&)’: user.cpp:57:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i ++) ^ user.cpp:68:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i ++) ^ user.cpp: In function ‘int main()’: user.cpp:102:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edge.size(); i ++) ^