Compilare: user.cpp: In function ‘int main()’: user.cpp:40:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Div.size() != N) continue; ^ user.cpp:46:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < Div.size(); ++ j) ^ user.cpp:58:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < Deg.size(); ++ j) ^ user.cpp:13:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divisorgraph.in", "r", stdin); ^ user.cpp:14:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divisorgraph.out", "w", stdout); ^ user.cpp:16:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &T); ^ user.cpp:21:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &N, &M); ^ user.cpp:24:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &X, &Y); ^