Compilare: user.cpp: In function ‘int query(int)’: user.cpp:13:12: warning: statement has no effect [-Wunused-value] for(pos;pos>0;pos=pos-((pos&(pos-1))^pos)) ^ user.cpp: In function ‘void update(int)’: user.cpp:19:12: warning: statement has no effect [-Wunused-value] for(pos;pos<=n;pos=pos+((pos&(pos-1))^pos)) ^ user.cpp: In function ‘void add_hash(int, int)’: user.cpp:24:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<table[hash1].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:59:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<table[i].size();j++) ^ user.cpp:40:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("subpermutari.in","r",stdin); ^ user.cpp:41:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("subpermutari.out","w",stdout); ^ user.cpp:44:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:46:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^