結果

問題 No.1065 電柱 / Pole (Easy)
ユーザー hiromi_ayasehiromi_ayase
提出日時 2020-05-29 21:50:16
言語 Java21
(openjdk 21)
結果
AC  
実行時間 1,106 ms / 2,000 ms
コード長 3,373 bytes
コンパイル時間 2,631 ms
コンパイル使用メモリ 79,328 KB
実行使用メモリ 89,752 KB
最終ジャッジ日時 2024-11-06 03:47:50
合計ジャッジ時間 31,319 ms
ジャッジサーバーID
(参考情報)
judge5 / judge3
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 58 ms
50,452 KB
testcase_01 AC 59 ms
50,180 KB
testcase_02 AC 742 ms
73,324 KB
testcase_03 AC 937 ms
82,336 KB
testcase_04 AC 960 ms
82,540 KB
testcase_05 AC 805 ms
83,488 KB
testcase_06 AC 770 ms
81,364 KB
testcase_07 AC 340 ms
65,392 KB
testcase_08 AC 722 ms
84,948 KB
testcase_09 AC 221 ms
56,124 KB
testcase_10 AC 452 ms
69,288 KB
testcase_11 AC 372 ms
65,172 KB
testcase_12 AC 309 ms
60,796 KB
testcase_13 AC 777 ms
75,844 KB
testcase_14 AC 863 ms
79,328 KB
testcase_15 AC 900 ms
80,784 KB
testcase_16 AC 602 ms
69,120 KB
testcase_17 AC 978 ms
83,200 KB
testcase_18 AC 479 ms
65,172 KB
testcase_19 AC 1,038 ms
79,488 KB
testcase_20 AC 432 ms
63,024 KB
testcase_21 AC 521 ms
67,376 KB
testcase_22 AC 877 ms
79,276 KB
testcase_23 AC 128 ms
52,252 KB
testcase_24 AC 133 ms
52,244 KB
testcase_25 AC 304 ms
62,348 KB
testcase_26 AC 683 ms
71,632 KB
testcase_27 AC 681 ms
69,568 KB
testcase_28 AC 964 ms
80,420 KB
testcase_29 AC 268 ms
61,416 KB
testcase_30 AC 1,020 ms
82,024 KB
testcase_31 AC 852 ms
74,232 KB
testcase_32 AC 599 ms
67,692 KB
testcase_33 AC 945 ms
79,712 KB
testcase_34 AC 515 ms
65,664 KB
testcase_35 AC 993 ms
79,744 KB
testcase_36 AC 118 ms
52,364 KB
testcase_37 AC 147 ms
53,412 KB
testcase_38 AC 121 ms
52,544 KB
testcase_39 AC 146 ms
53,352 KB
testcase_40 AC 96 ms
51,632 KB
testcase_41 AC 1,106 ms
89,752 KB
testcase_42 AC 508 ms
65,836 KB
testcase_43 AC 721 ms
70,932 KB
testcase_44 AC 390 ms
63,332 KB
testcase_45 AC 738 ms
69,776 KB
testcase_46 AC 58 ms
50,248 KB
testcase_47 AC 63 ms
50,700 KB
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.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;
import java.util.TreeSet;

public class Main {

    private static java.io.InputStream is = System.in;
    private static java.io.PrintWriter out = new java.io.PrintWriter(System.out);
    private static java.util.StringTokenizer tokenizer = null;
    private static java.io.BufferedReader reader;
    static {
        reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768);
    }

    public static String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new java.util.StringTokenizer(reader.readLine());
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }

    private static int ni() {
        return Integer.parseInt(next());
    }

    public static void main(String[] args) {
        int n = ni();
        int m = ni();
        int x = ni() - 1;
        int y = ni() - 1;

        int[][] p = new int[n][];
        for (int i = 0; i < n; i++) {
            p[i] = new int[] { ni(), ni() };
        }

        int[] from = new int[m];
        int[] to = new int[m];
        int[] w = new int[m];
        for (int i = 0; i < m; i++) {
            from[i] = ni() - 1;
            to[i] = ni() - 1;

            int dx = p[from[i]][0] - p[to[i]][0];
            int dy = p[from[i]][1] - p[to[i]][1];
            w[i] = dx * dx + dy * dy;
        }

        int[][][] g = packWU(n, from, to, w);
        double[] d = dijk(g, x);
        System.out.println(d[y]);
    }

    public static int[][][] packWU(int n, int[] from, int[] to, int[] w) {
        return packWU(n, from, to, w, from.length);
    }

    public static int[][][] packWU(int n, int[] from, int[] to, int[] w, int sup) {
        int[][][] g = new int[n][][];
        int[] p = new int[n];
        for (int i = 0; i < sup; i++)
            p[from[i]]++;
        for (int i = 0; i < sup; i++)
            p[to[i]]++;
        for (int i = 0; i < n; i++)
            g[i] = new int[p[i]][2];
        for (int i = 0; i < sup; i++) {
            --p[from[i]];
            g[from[i]][p[from[i]]][0] = to[i];
            g[from[i]][p[from[i]]][1] = w[i];
            --p[to[i]];
            g[to[i]][p[to[i]]][0] = from[i];
            g[to[i]][p[to[i]]][1] = w[i];
        }
        return g;
    }

    public static double[] dijk(int[][][] g, int from) {
        int n = g.length;
        final double[] td = new double[n];
        Arrays.fill(td, Integer.MAX_VALUE);
        TreeSet<Integer> q = new TreeSet<Integer>(new Comparator<Integer>() {
            public int compare(Integer a, Integer b) {
                if (td[a] - td[b] != 0)
                    return Double.compare(td[a], td[b]);
                return a - b;
            }
        });
        q.add(from);
        td[from] = 0;

        while (q.size() > 0) {
            int cur = q.pollFirst();

            for (int i = 0; i < g[cur].length; i++) {
                int next = g[cur][i][0];
                double nd = td[cur] + Math.sqrt(g[cur][i][1]);
                if (nd < td[next]) {
                    q.remove(next);
                    td[next] = nd;
                    q.add(next);
                }
            }
        }

        return td;
    }
}
0