提出 #74105493

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ソースコード 拡げる

import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        InputReader reader = new InputReader(System.in);
        PrintWriter writer = new PrintWriter(System.out, false);
        int N = reader.nextInt();
        int L = reader.nextInt();
        int R = reader.nextInt();
        String S = reader.next();
        Map<Character, List<Integer>> tracks = new HashMap<>();
        for (int i = 0; i < N; i++) {
            tracks.computeIfAbsent(S.charAt(i), list -> new ArrayList<>()).add(i);
        }
        long result = 0;
        for (List<Integer> indices : tracks.values()) {
            for (int idx : indices) {
                int lef = binarySearch(indices, idx + L);
                int rig = binarySearch(indices, idx + R + 1);
                result += rig - lef;
            }
        }
        writer.println(result);
        writer.close();
        System.exit(0);
    }

    private static int binarySearch(List<Integer> indices, int K) {
        int low = 0, high = indices.size();
        while (low < high) {
            int mid = (low + high) / 2;
            if (indices.get(mid) < K) low = mid + 1;
            else high = mid;
        }
        return low;
    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }
        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
        public int nextInt() {
            return Integer.parseInt(next());
        }
        public long nextLong() {
            return Long.parseLong(next());
        }
        public double nextDouble() {
            return Double.parseDouble(next());
        }
        public String nextLine() {
            String str = "";
            try {
                str = reader.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}

提出情報

ジャッジ結果