Compilare: user.cpp: In function ‘void Melysegi(int)’: user.cpp:65:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < G[ind].size(); j++) { ^ user.cpp: In function ‘void MelysegiInv(int)’: user.cpp:75:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < invG[ind].size(); j++) { ^ user.cpp: In function ‘int main()’: user.cpp:21:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in", "r", stdin); ^ user.cpp:22:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.out", "w", stdout); ^ user.cpp:23:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:26:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a, &b); ^