Compilare: user.cpp: In function ‘int query(int)’: user.cpp:18:10: warning: statement has no effect [-Wunused-value] for(x;x>0;x-=(x&(x-1))^x) ^ user.cpp: In function ‘void update(int, int)’: user.cpp:24:10: warning: statement has no effect [-Wunused-value] for(x;x<=20000;x+=(x&(x-1))^x) ^ user.cpp: In function ‘int main()’: user.cpp:29:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuburi3.in","r",stdin); ^ user.cpp:30:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuburi3.out","w",stdout); ^ user.cpp:32:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:34:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].l,&v[i].g); ^ user.cpp:49:20: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] poz=up[poz]; ^