#include<secret.h>
int pref[15][1005],n,mask[1005];
void dnc(int l,int r,int level,int a[])
{
if(l==r) return;
int mid=(l+r)>>1;
pref[level][mid]=a[mid];
pref[level][mid+1]=a[mid+1];
for(int i=mid+2;i<=r;i++) pref[level][i]=Secret(pref[level][i-1],a[i]);
for(int i=mid-1;i>=l;i--) pref[level][i]=Secret(a[i],pref[level][i+1]);
for(int i=mid+1;i<=r;i++) mask[i]|=(1<<level);
dnc(l,mid,level+1,a);dnc(mid+1,r,level+1,a);
}
void Init(int N,int A[])
{
dnc(0,N-1,0,A);
}
int Query(int L,int R)
{
if(L==R) return a[L];
int k=__builtin_ctz(mask[L]^mask[R]);
return Secret(pref[k][L],pref[k][R]);
}
Compilation message
secret.cpp: In function 'int Query(int, int)':
secret.cpp:24:21: error: 'a' was not declared in this scope
24 | if(L==R) return a[L];
| ^
