結果

問題 No.2565 はじめてのおつかい
ユーザー oginoshikibu
提出日時 2023-12-02 15:51:40
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 252 ms / 2,000 ms
コード長 1,415 bytes
コンパイル時間 381 ms
コンパイル使用メモリ 82,432 KB
実行使用メモリ 113,544 KB
最終ジャッジ日時 2024-09-26 19:25:13
合計ジャッジ時間 9,868 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
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ファイルパターン 結果
sample AC * 3
other AC * 50
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

from collections import defaultdict, deque
n, m = map(int, input().split())
graph = defaultdict(set)
for i in range(m):
a, b = map(lambda x: int(x) - 1, input().split())
graph[a].add(b)
INF = float("inf")
startdist = [INF for _ in range(n)]
startdist[0]=0
startD=deque()
startD.append([0,0])
while startD:
now, dist = startD.popleft()
if startdist[now] < dist:
continue
for next in graph[now]:
if startdist[next] > dist + 1:
startdist[next] = dist + 1
startD.append([next, dist + 1])
if startdist[-1]==INF or startdist[-2]==INF:
print("-1")
exit()
INF = float("inf")
n1dist = [INF for _ in range(n)]
n1dist[-1]=0
n1D=deque()
n1D.append([n-1,0])
while n1D:
now, dist = n1D.popleft()
if n1dist[now] < dist:
continue
for next in graph[now]:
if n1dist[next] > dist + 1:
n1dist[next] = dist + 1
n1D.append([next, dist + 1])
INF = float("inf")
n2dist = [INF for _ in range(n)]
n2dist[-2]=0
n2D=deque()
n2D.append([n-2,0])
while n2D:
now, dist = n2D.popleft()
if n2dist[now] < dist:
continue
for next in graph[now]:
if n2dist[next] > dist + 1:
n2dist[next] = dist + 1
n2D.append([next, dist + 1])
ans = INF
ans = min(ans, startdist[-1]+n1dist[-2]+n2dist[0])
ans = min(ans, startdist[-2]+n2dist[-1]+n1dist[0])
print(ans if ans!=INF else -1)
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