Compilare: user.cpp: In function ‘int BFS(int, int, std::vector<int>*, int*)’: user.cpp:26:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < succs.size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:82:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (color[j] == 0) ^ user.cpp:90:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < res.size(); ++j) ^