結果

問題 No.124 門松列(3)
ユーザー maspy
提出日時 2020-03-19 23:36:30
言語 Python3
(3.13.1 + numpy 2.2.1 + scipy 1.14.1)
結果
AC  
実行時間 317 ms / 5,000 ms
コード長 1,439 bytes
コンパイル時間 316 ms
コンパイル使用メモリ 12,928 KB
実行使用メモリ 17,024 KB
最終ジャッジ日時 2024-12-14 03:39:56
合計ジャッジ時間 4,907 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 4
other AC * 26
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 #
プレゼンテーションモードにする

#!/usr/bin/ python3.8
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import itertools
from collections import deque
W, H = map(int, readline().split())
C = tuple(map(int, read().split()))
dx = (1, 0, -1, 0)
dy = (0, 1, 0, -1)
N = H * W
graph = [[] for _ in range(4 * N + 2)]
for i in range(N):
    x, y = divmod(i, W)
    for j, k in itertools.product(range(4), repeat=2):
        x1 = x - dx[j]
        y1 = y - dy[j]
        x2 = x + dx[k]
        y2 = y + dy[k]
        if not ((0 <= x1 < H) and (0 <= y1 < W)):
            continue
        if not ((0 <= x2 < H) and (0 <= y2 < W)):
            continue
        i1 = x1 * W + y1
        i2 = x2 * W + y2
        n = C[i]
        n1 = C[i1]
        n2 = C[i2]
        if n1 == n2:
            continue
        if (n1 <= n <= n2) or (n1 >= n >= n2):
            continue
        v = 4 * i1 + j
        w = 4 * i + k
        graph[v].append(w)
start = 4 * N
goal = 4 * N + 1
graph[start] = [0, 1]
graph[4 * (W * (H - 1) - 1)].append(goal)
graph[4 * (H * W - 2) + 1].append(goal)
INF = 4 * N + 100
dist = [INF] * (4 * N + 2)
dist[start] = 0
q = deque([start])
while q:
    v = q.popleft()
    dv = dist[v]
    dw = dv + 1
    for w in graph[v]:
        if dist[w] <= dw:
            continue
        dist[w] = dw
        q.append(w)
answer = dist[goal] - 1
if answer > 4 * N + 2:
    answer = -1
print(answer)
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