結果

問題 No.1995 CHIKA Road
ユーザー tentententen
提出日時 2022-07-12 10:49:24
言語 Java21
(openjdk 21)
結果
WA  
実行時間 -
コード長 2,783 bytes
コンパイル時間 2,391 ms
コンパイル使用メモリ 77,000 KB
実行使用メモリ 98,592 KB
最終ジャッジ日時 2023-09-05 10:34:39
合計ジャッジ時間 24,008 ms
ジャッジサーバーID
(参考情報)
judge15 / judge13
このコードへのチャレンジ
(要ログイン)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 37 ms
33,980 KB
testcase_01 AC 36 ms
33,632 KB
testcase_02 AC 35 ms
33,536 KB
testcase_03 WA -
testcase_04 WA -
testcase_05 WA -
testcase_06 WA -
testcase_07 WA -
testcase_08 WA -
testcase_09 WA -
testcase_10 AC 468 ms
46,600 KB
testcase_11 WA -
testcase_12 AC 712 ms
77,236 KB
testcase_13 WA -
testcase_14 WA -
testcase_15 WA -
testcase_16 WA -
testcase_17 WA -
testcase_18 WA -
testcase_19 WA -
testcase_20 WA -
testcase_21 WA -
testcase_22 WA -
testcase_23 WA -
testcase_24 WA -
testcase_25 WA -
testcase_26 WA -
testcase_27 WA -
testcase_28 WA -
testcase_29 WA -
testcase_30 WA -
testcase_31 WA -
testcase_32 WA -
testcase_33 WA -
testcase_34 WA -
testcase_35 WA -
testcase_36 WA -
testcase_37 WA -
testcase_38 WA -
testcase_39 WA -
権限があれば一括ダウンロードができます

ソースコード

diff #

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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        int[] lefts = new int[m];
        int[] rights = new int[m];
        TreeMap<Integer, Integer> compress = new TreeMap<>();
        for (int i = 0; i < m; i++) {
            lefts[i] = sc.nextInt();
            compress.put(lefts[i], null);
            rights[i] = sc.nextInt();
            compress.put(rights[i], null);
        }
        int idx = 0;
        for (int x : compress.keySet()) {
            compress.put(x, idx++);
        }
        ArrayList<ArrayList<Integer>> graph = new ArrayList<>();
        for (int i = 0; i < idx; i++) {
            graph.add(new ArrayList<>());
        }
        for (int i = 0; i < m; i++) {
            graph.get(compress.get(lefts[i])).add(compress.get(rights[i]));
        }
        int[] counts = new int[idx + 1];
        Arrays.fill(counts, -1);
        counts[idx] = Integer.MAX_VALUE;
        PriorityQueue<Path> queue = new PriorityQueue<>();
        queue.add(new Path(0, 0));
        while (queue.size() > 0) {
            Path p = queue.poll();
            if (counts[p.idx] >= p.value) {
                continue;
            }
            counts[p.idx] = p.value;
            for (int x : graph.get(p.idx)) {
                queue.add(new Path(x, p.value + 1));
            }
            if (counts[p.idx + 1] == -1) {
                queue.add(new Path(p.idx + 1, p.value));
            }
        }
        System.out.println((n - 1) * 2 - counts[idx - 1]);
    }
    
    static class Path implements Comparable<Path> {
        int idx;
        int value;
        
        public Path(int idx, int value) {
            this.idx = idx;
            this.value = value;
        }
        
        public int compareTo(Path another) {
            if (another.value == value) {
                return idx - another.idx;
            } else {
                return another.value - value;
            }
        }
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}
0