[AcWing 841] 字符串哈希

#include<iostream>

using namespace std;
typedef unsigned long long ULL;
const int N = 1e5 + 10;
const int P = 131;
int h[N], p[N];
char str[N];
ULL get(int l, int r)
{
    return h[r] - h[l - 1] * p[r - l + 1];
}
int main()
{
    int n, m;
    cin >> 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, r1, l2, r2;
        cin >> l1 >> r1 >> l2 >> r2;
        if (get(l1, r1) == get(l2, r2))     puts("Yes");
        else    puts("No");
    }
    return 0;
}