Compilare: user.cpp: In function ‘int main()’: user.cpp:20:19: warning: unused variable ‘cate’ [-Wunused-variable] int n,q,i,a,b,cate,j; ^ user.cpp:20:24: warning: unused variable ‘j’ [-Wunused-variable] int n,q,i,a,b,cate,j; ^ user.cpp:27:18: warning: iteration 499998u invokes undefined behavior [-Waggressive-loop-optimizations] if(ciur[i]==0) ^ user.cpp:25:5: note: containing loop for(i=1;i<=500000;i++) ^