Compilare: user.cpp: In function ‘int main()’: user.cpp:33:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(y=0;y<a[v[x]].size();y++) ^ user.cpp:51:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(y=0;y<a[v[x]].size();y++) ^ user.cpp: In function ‘void citire()’: user.cpp:12:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("darb.in","r",stdin); ^ user.cpp:13:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("darb.out","w",stdout); ^ user.cpp:14:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:17:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&i,&j); ^