Compilare: user.cpp: In function ‘int main()’: user.cpp:42:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (Bad[node].size() == bad_edges) { ^ user.cpp:68:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (oth > node && Bad[oth].size() + Bad[node].size() == bad_edges) { ^ user.cpp:10:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("incurcatura.in", "r", stdin); ^ user.cpp:11:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("incurcatura.out", "w", stdout); ^