奇妙RE求问

#include<bits/stdc++.h>
#define ll long long
using namespace std;

const int N = 4e5+10;
const ll INF = 1e9;
const ll mjq = 1e9 + 7;
ll pre[N],n,m,q;
char a[4500000];
ll ans[N][62],lca[N][62]; 
int main()
{
	freopen("1.txt","r",stdin);
	freopen("2.txt","w",stdout);
	cin>>n>>m>>q;  
	for(int i = 1;i <= n;i ++)
	{
		cin>>a[i];
		a[i+n] = a[i];
	}