Compilare: user.cpp: In function ‘void DFP(int)’: user.cpp:17:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[Node].size(); ++ i) ^ user.cpp: In function ‘void DFM(int)’: user.cpp:27:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < GT[Node].size(); ++ i) ^ user.cpp: In function ‘int main()’: user.cpp:58:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < CTC.size(); ++ i) ^ user.cpp:60:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < CTC[i].size(); ++ j) ^ user.cpp:34:34: 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:35:36: 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:37:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &N, &M); ^ user.cpp:40:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &X, &Y); ^