Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:19:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vecini[k].size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:32:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vecini[x].size(); i++){ ^ user.cpp:26:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grarb.in","r",stdin); ^ user.cpp:27:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grarb.out","w",stdout); ^ user.cpp:28:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:30:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^