2023-8-26 字符串哈希

题目链接：字符串哈希

#include 

using namespace std;

typedef unsigned long long ULL;

const int N = 100010, P = 131;

char str[N];
ULL h[N], p[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)) cout << "Yes" << endl;
        else cout << "No" << endl;
    }
    return 0;
}