Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:32:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < V.size(); i++) ^ user.cpp: In function ‘int Solve(int, std::vector<int>)’: user.cpp:54:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L.size(); i++) ^ user.cpp:66:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Sol[old].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:92:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Sol[1].size(); i++) ^