結果

問題 No.340 雪の足跡
ユーザー eitahoeitaho
提出日時 2016-03-23 05:23:33
言語 C#(csc)
(csc 3.9.0)
結果
WA  
実行時間 -
コード長 5,194 bytes
コンパイル時間 1,038 ms
コンパイル使用メモリ 119,260 KB
実行使用メモリ 61,496 KB
最終ジャッジ日時 2024-04-09 19:17:51
合計ジャッジ時間 8,548 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge5
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 26 ms
27,652 KB
testcase_01 AC 26 ms
27,448 KB
testcase_02 AC 25 ms
25,432 KB
testcase_03 AC 26 ms
27,536 KB
testcase_04 AC 26 ms
25,364 KB
testcase_05 WA -
testcase_06 AC 26 ms
25,388 KB
testcase_07 AC 25 ms
27,532 KB
testcase_08 AC 26 ms
23,480 KB
testcase_09 AC 26 ms
25,500 KB
testcase_10 AC 27 ms
25,736 KB
testcase_11 AC 32 ms
28,164 KB
testcase_12 AC 31 ms
25,608 KB
testcase_13 AC 31 ms
25,612 KB
testcase_14 AC 52 ms
27,868 KB
testcase_15 AC 59 ms
30,080 KB
testcase_16 AC 50 ms
25,816 KB
testcase_17 AC 66 ms
30,208 KB
testcase_18 AC 61 ms
32,388 KB
testcase_19 AC 67 ms
32,496 KB
testcase_20 AC 366 ms
55,676 KB
testcase_21 AC 289 ms
49,844 KB
testcase_22 AC 38 ms
30,584 KB
testcase_23 WA -
testcase_24 AC 345 ms
51,568 KB
testcase_25 AC 384 ms
53,216 KB
testcase_26 AC 87 ms
42,392 KB
testcase_27 AC 40 ms
27,792 KB
testcase_28 AC 78 ms
38,424 KB
testcase_29 AC 398 ms
56,056 KB
testcase_30 AC 260 ms
46,412 KB
testcase_31 AC 422 ms
54,208 KB
testcase_32 AC 473 ms
53,112 KB
testcase_33 AC 351 ms
47,912 KB
testcase_34 AC 469 ms
53,004 KB
testcase_35 AC 463 ms
61,496 KB
testcase_36 AC 464 ms
61,400 KB
権限があれば一括ダウンロードができます
コンパイルメッセージ
Microsoft (R) Visual C# Compiler version 3.9.0-6.21124.20 (db94f4cc)
Copyright (C) Microsoft Corporation. All rights reserved.

ソースコード

diff # 

using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;

class Program
{
    static readonly int INF = (int)1e9;
    static readonly string Impossible = "Odekakedekinai..";
    static readonly int[] DR = { 0, 1, 0, -1 };
    static readonly int[] DC = { 1, 0, -1, 0 };

    public void Solve()
    {
        int W = Reader.Int(), H = Reader.Int(), N = Reader.Int();
        var table = Reader.IntTable(N * 2);
        long[][] row = new long[H][];
        long[][] col = new long[W][];

        for (int r = 0; r < H; r++)
            row[r] = new long[(W + 63) / 64];
        for (int c = 0; c < W; c++)
            col[c] = new long[(H + 63) / 64];

        for (int ti = 1; ti < N * 2; ti += 2)
        {
            var t = table[ti];
            for (int i = 0; i + 1 < t.Length; i++)
            {
                int r = t[i] / W, c = t[i] % W;
                int nr = t[i + 1] / W, nc = t[i + 1] % W;
                if (Math.Sign(nr - r) != 0)
                    BitArrayOr(col[c], Math.Min(r, nr), Math.Max(r, nr) + 1);
                else
                    BitArrayOr(row[r], Math.Min(c, nc), Math.Max(c, nc) + 1);
            }
        }
        bool[, ,] G = new bool[H, W, 4];
        for (int r = 0; r < H; r++)
            for (int c = 0; c + 1 < W; c++)
                if ((row[r][c / 64] >> c & 1) == 1 && (row[r][(c + 1) / 64] >> (c + 1) & 1) == 1)
                {
                    G[r, c, 0] = true;
                    G[r, c + 1, 2] = true;
                }
        for (int c = 0; c < W; c++)
            for (int r = 0; r + 1 < H; r++)
                if ((col[c][r / 64] >> r & 1) == 1 && (col[c][(r + 1) / 64] >> (r + 1) & 1) == 1)
                {
                    G[r, c, 1] = true;
                    G[r + 1, c, 3] = true;
                }

        int ans = BFS(G, H, W);
        Console.WriteLine(ans == INF ? Impossible : ans + "");
    }

    // [L, R)
    static void BitArrayOr(long[] A, int L, int R)
    {
        if (L >= R) return;
        int Li = L >> 6;
        if (Li == (R - 1 >> 6))
        {
            if (R - L == 64) A[Li] |= -1L;
            else A[Li] |= (1L << R - L) - 1 << L;
            return;
        }
        int Ri = R >> 6;
        if ((L & 63) == 0) A[Li] |= -1L;
        else A[Li] |= (1L << 64 - L) - 1 << L;
        for (int i = Li + 1; i < Ri; i++) A[i] = -1L;
        A[Ri] |= (1L << R) - 1;
    }

    private int BFS(bool[, ,] G, int H, int W)
    {
        var minCost = new int[H, W];
        for (int r = 0; r < H; r++)
            for (int c = 0; c < W; c++)
                minCost[r, c] = INF;
        minCost[0, 0] = 0;
        var que = new Queue<int>();
        que.Enqueue(0); que.Enqueue(0);

        while (que.Count > 0)
        {
            int r = que.Dequeue(), c = que.Dequeue();
            for (int d = 0; d < DR.Length; d++)
                if (G[r, c, d])
                {
                    int nr = r + DR[d], nc = c + DC[d];
                    int nextCost = minCost[r, c] + 1;
                    if (nextCost < minCost[nr, nc])
                    {
                        if (nr == H - 1 && nc == W - 1) return nextCost;
                        minCost[nr, nc] = nextCost;
                        que.Enqueue(nr); que.Enqueue(nc);
                    }
                }
        }

        return INF;
    }

}


class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    private static TextReader reader = Console.In;
    private static readonly char[] separator = { ' ' };
    private static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    private static string[] A = new string[0];
    private static int i;
    private static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
    public static int[][] IntTable(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
    public static string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Next()).ToArray(); }
    public static string Line() { return reader.ReadLine().Trim(); }
    private static string[] Split(string s) { return s.Split(separator, op); }
    private static string Next() { CheckNext(); return A[i++]; }
    private static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}
0