Submission #74093826

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Source Code Expand

#include <bits/stdc++.h>
#define ll long long
const ll N = 2e5 + 5, MOD = 998244353, inf = 2e18;
using namespace std;
int dx[] = {0, 0, 1, -1, 1, 1, -1, -1};
int dy[] = {1, -1, 0, 0, 1, -1, 1, -1};
char di[] = {'R', 'L', 'D', 'U'};
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<class T>
using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;

void Ebraam() {
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
#ifndef ONLINE_JUDGE
    freopen("Input.txt", "r", stdin);
    freopen("Output.txt", "w", stdout);
#endif
}

void solve() {
    int n, l, r;
    cin >> n >> l >> r;
    string s;
    cin >> s;
    vector<vector<int> > pre(30, vector<int>(n + 5, 0));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < 26; j++) {
            pre[j][i + 1] = pre[j][i] + (s[i] - 'a' == j);
        }
    }
    ll ans = 0;
    for (int i = 1; i + l <= n; i++) {
        ans += pre[s[i - 1] - 'a'][min(n, i + r)] - pre[s[i - 1] - 'a'][i + l - 1];
    }
    cout << ans;
}

int main() {
    Ebraam();
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
        if (t)cout << endl;
    }
    return 0;
}

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