Compilare: user.cpp: In function ‘void DFS(const int&)’: user.cpp:24:37: 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:58:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < B[node].size(); i ++) ^ user.cpp:69:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < B[node].size(); i ++) ^ user.cpp: In function ‘void DFS2(const int&)’: user.cpp:87:37: 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:123:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edge.size(); i ++) ^