Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:21:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<GN[nod].size(); ++i) ^ user.cpp: In function ‘int dfs2(int)’: user.cpp:30:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[nod].size(); ++i) ^ user.cpp: In function ‘int rezolvaCiclu(int, int)’: user.cpp:40:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G[a].size(); ++j) ^ user.cpp:50:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<GN[b].size(); ++j) ^ user.cpp:60:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G[a].size(); ++j) ^ user.cpp: In function ‘int main()’: user.cpp:76:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.in", "rt", stdin); ^ user.cpp:77:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.out", "wt", stdout); ^ user.cpp:78:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:84:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:89:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^