30 lines
683 B
C++
30 lines
683 B
C++
#include <bits/stdc++.h>
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using namespace std;
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typedef unsigned long long ULL;
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const int N = 100010;
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const int P = 131;
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int n, m;
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string str;
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ULL h[N], b[N];
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ULL get(int l, int r) {
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return h[r] - h[l - 1] * b[r - l + 1];
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}
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int main() {
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cin >> n >> m >> str;
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b[0] = 1; // p^0=1,初始化
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for (int i = 1; i <= n; i++) {
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b[i] = b[i - 1] * P; // 基数
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h[i] = h[i - 1] * P + str[i - 1]; // 前缀和
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}
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while (m--) {
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int l1, r1, l2, r2;
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cin >> l1 >> r1 >> l2 >> r2;
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if (get(l1, r1) == get(l2, r2))
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puts("Yes");
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else
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puts("No");
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}
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return 0;
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} |