字符串模拟哈希板子

字符串哈希板子

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

typedef unsigned long long ULL;
const int N = 1e5 + 10, P = 131;

int n, m;
char str[N];
ULL p[N], h[N];

ULL get(int l, int r){
    return h[r] - h[l-1] * p[r - l + 1];
}
signed main(){
    scanf("%d%d%s", &n, &m, str + 1);
    p[0] = 1;
    for(int i = 1; i <= n; ++i){
        p[i] = p[i-1] * P;
        h[i] = h[i-1] * P + str[i];
    }
    while(m--){
        int l1, l2, r1, r2;
        scanf("%d%d%d%d", &l1, &r1, &l2, &r2);
        if(get(l1, r1) == get(l2, r2)) puts("Yes");
        else puts("No");
    }
    
    return 0;
}