This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define MAX 505000
void init(int n, const char s[]);
int query(int i, int k);
std::vector<int> cores[26];
int inverte(int x,int k){
int ans=0;
for(int i=0;i!=k;++i){
int u = (k-1)-i;
if((1<<i)&x)ans+=1<<u;
}
return ans;
}
int pec[MAX][20];
int lim;
char vals[MAX];
void init(int n, const char s[]) {
for(int j=0;j!=n;++j){
vals[j]=s[j];
cores[s[j]-'a'].push_back(j);
}
for(int i=0;i!=20;++i){
int sz = 1<<i;
if(sz>MAX)break;
for(int k=0;k!=sz;++k){
pec[k][i]=inverte(k,i);
}
}
lim = n;
}
int query(int i, int k) {
int sz = 1<<(k);
if(i+sz>lim)return 0;
int count=0;
for(int j=0;j!=sz;++j){
int mirror = pec[j][k];
count++;
if(vals[mirror+i]!=vals[j+i])return 0;
if(count==505)break;
}
///Ideia: testar um tiquinho de cada cor
/* for(int j=0;j!=26;++j){
int l=0,r=cores[j].size();
while(l<r){
int m = (l+r)/2;
if(cores[j][m]>i){
r=m;
}else l=m+1;
}
int anda=0;
while(l<cores[j].size()&&anda<50&&cores[j][l]<i+sz){
int pos = cores[j][l];
int mirror = pec[pos-i][k];
count++;
if(vals[mirror+i]!=vals[j+i])return 0;
++anda;
++l;
}
}*/
return 1;
}
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