結果

問題 No.367 ナイトの転身
ユーザー はむ吉🐹はむ吉🐹
提出日時 2016-05-01 20:06:57
言語 Python3
(3.12.2 + numpy 1.26.4 + scipy 1.12.0)
結果
AC  
実行時間 1,967 ms / 2,000 ms
コード長 1,778 bytes
コンパイル時間 119 ms
コンパイル使用メモリ 12,800 KB
実行使用メモリ 15,616 KB
最終ジャッジ日時 2024-10-05 00:51:17
合計ジャッジ時間 6,337 ms
ジャッジサーバーID
(参考情報)
judge3 / 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 29 ms
11,008 KB
testcase_01 AC 28 ms
10,880 KB
testcase_02 AC 26 ms
11,008 KB
testcase_03 AC 27 ms
10,880 KB
testcase_04 AC 28 ms
10,880 KB
testcase_05 AC 27 ms
10,880 KB
testcase_06 AC 28 ms
11,008 KB
testcase_07 AC 26 ms
11,008 KB
testcase_08 AC 27 ms
10,880 KB
testcase_09 AC 27 ms
10,880 KB
testcase_10 AC 1,213 ms
15,616 KB
testcase_11 AC 1,967 ms
15,616 KB
testcase_12 AC 148 ms
12,928 KB
testcase_13 AC 197 ms
12,672 KB
testcase_14 AC 488 ms
12,672 KB
testcase_15 AC 37 ms
11,136 KB
testcase_16 AC 463 ms
12,416 KB
testcase_17 AC 91 ms
11,136 KB
testcase_18 AC 120 ms
11,264 KB
testcase_19 AC 109 ms
11,392 KB
testcase_20 AC 46 ms
11,136 KB
testcase_21 AC 119 ms
11,264 KB
testcase_22 AC 28 ms
11,008 KB
testcase_23 AC 29 ms
11,008 KB
testcase_24 AC 36 ms
11,008 KB
testcase_25 AC 33 ms
10,880 KB
testcase_26 AC 27 ms
10,880 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 #

#!/usr/bin/env python3

import array
import collections


DS_KNIGHT = [(1, 2), (-1, -2), (1, -2), (-1, 2), (2, 1), (-2, -1), (2, -1), (-2, 1)]
DS_MB = [(1, 1), (-1, -1), (1, -1), (-1, 1)]
INF = 10 ** 8
Status = collections.namedtuple("Status", "is_knight r c")


def min_num_of_operations(height, width, board, start, goal):
    s_start = Status(True, start[0], start[1])
    dist = [[array.array("L", (INF for _ in range(width))) for _ in range(height)] for _ in range(2)]
    dist[s_start.is_knight][s_start.r][s_start.c] = 0
    q = collections.deque()
    q.append(s_start)
    while q:
        s0 = q.popleft()
        if (s0.r, s0.c) == goal:
            break
        for dr, dc in (DS_KNIGHT if s0.is_knight else DS_MB):
            (r, c) = (s0.r + dr, s0.c + dc)
            if r < 0 or r >= height or c < 0 or c >= width:
                continue
            else:
                new_type = s0.is_knight ^ (board[r][c] == 'R')
                if dist[int(new_type)][r][c] >= INF:
                    s = Status(new_type, r, c)
                    q.append(s)
                    dist[int(new_type)][r][c] = dist[int(s0.is_knight)][s0.r][s0.c] + 1
    return min(dist[True][goal[0]][goal[1]], dist[False][goal[0]][goal[1]])


def main():
    height, width = map(int, input().split())
    board = []
    start = None
    goal = None
    for r in range(height):
        row = input()
        if start is None or goal is None:
            for c in range(width):
                if row[c] == "S":
                    start = (r, c)
                elif row[c] == "G":
                    goal = (r, c)
        board.append(row)
    ans = min_num_of_operations(height, width, board, start, goal)
    print(ans if ans < INF else -1)


if __name__ == '__main__':
    main()
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