Compilare: user.cpp: In function ‘void Add(int)’: user.cpp:9:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[S].size();i++) ^ user.cpp: In function ‘void Delete(int)’: user.cpp:16:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[S].size();i++) ^ user.cpp: In function ‘void Search(int)’: user.cpp:25:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[S].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:35:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.in","r",stdin); ^ user.cpp:36:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.out","w",stdout); ^ user.cpp:37:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:40:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&op,&x); ^