提出 #74623274

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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 G = reader.nextInt();
        int F = reader.nextInt();
        int[][] A = new int[N][2];
        for (int i = 0; i < N; i++) {
            for (int j = 0; j < 2; j++) {
                A[i][j] = reader.nextInt();
            }
        }
        writer.println(minimumStops(A, G, F));
        writer.close();
        System.exit(0);
    }

    private static int minimumStops(int[][] stations, int target, int tank) {
        Arrays.sort(stations, Comparator.comparing(a -> a[0]));
        PriorityQueue<Integer> fuels = new PriorityQueue<>(Collections.reverseOrder());
        int answer = 0, prev = 0;
        for (int[] station : stations) {
            int loc = station[0], fuel = station[1];
            tank -= loc - prev;
            while (!fuels.isEmpty() && tank < 0) {
                tank += fuels.poll();
                answer += 1;
            }
            if (tank < 0) return -1;
            fuels.offer(fuel);
            prev = loc;
        }
        tank -= target - prev;
        while (!fuels.isEmpty() && tank < 0) {
            tank += fuels.poll();
            answer += 1;
        }
        if (tank < 0) return -1;
        return answer;
    }

    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