Compilare: user.cpp: In function ‘int main()’: user.cpp:46:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<G[curent].size(); i++) if (drum[G[curent][i]]==-1) ^ user.cpp:19:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.in","r",stdin); ^ user.cpp:20:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.out","w",stdout); ^ user.cpp:21:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:22:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&pl,&pc,&cl,&cc); ^ user.cpp:23:67: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1; i<=n; i++) for (j=1; j<=m; j++) scanf("%d",&a[i][j]); ^ user.cpp:40:40: warning: iteration 299u invokes undefined behavior [-Waggressive-loop-optimizations] for (i=1; i<=30000; i++) drum[i]=-1; ^ user.cpp:40:5: note: containing loop for (i=1; i<=30000; i++) drum[i]=-1; ^