Compilare: user.cpp: In function ‘void DFS(int, int, int&, std::vector<bool>&, std::vector<char>&)’: user.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto i = 0; i < A[x].size(); i++) ^ user.cpp:22:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto j = 0; j < A[y].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:54:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto j = 0; j < A[i].size() - 1; j++) ^ user.cpp:55:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto w = j + 1; w < A[i].size(); w++) ^ user.cpp:67:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto j = 0; j < A[i].size(); j++) ^