Compilare: user.cpp: In function ‘void s_topologica1(int)’: user.cpp:18:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g1[nod].size(); i++) ^ user.cpp: In function ‘void s_topologica2(int)’: user.cpp:28:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g2[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:72:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<ctc[i].size(); j++) ^ user.cpp:37:34: 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:38:36: 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:41:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d \n", &n, &m); ^ user.cpp:45:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d \n", &x, &y); ^