Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:15:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v1[nod].size(); ++i) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:28:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) ^ user.cpp:27:9: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok = 0; ^ user.cpp: In function ‘int main()’: user.cpp:48:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("examene.in","r",stdin); ^ user.cpp:49:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("examene.out","w",stdout); ^ user.cpp:50:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&ut); ^ user.cpp:53:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:59:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&u[i]); ^