結果
| 問題 |
No.807 umg tours
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-11-13 20:46:13 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 1,888 ms / 4,000 ms |
| コード長 | 1,233 bytes |
| コンパイル時間 | 241 ms |
| コンパイル使用メモリ | 82,196 KB |
| 実行使用メモリ | 158,232 KB |
| 最終ジャッジ日時 | 2024-11-23 19:45:42 |
| 合計ジャッジ時間 | 19,934 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 26 |
ソースコード
from heapq import heappop, heappush
N, M = map(int, input().split())
INF = float('inf')
isOnePath = [False] * N
edges = [[] for _ in range(N)]
for _ in range(M):
A, B, C = map(int, input().split())
A -= 1
B -= 1
edges[A].append((B, C))
edges[B].append((A, C))
minDist = [[INF] * N for _ in range(2)]
que = [(0, (0, 0))]
while que:
dist, (now, height) = heappop(que)
if minDist[height][now] <= dist:
continue
minDist[height][now] = dist
if height == 0:
for to, cost in edges[now]:
if minDist[0][to] > dist + cost:
heappush(que, (dist + cost, (to, 0)))
if minDist[1][to] > dist:
heappush(que, (dist, (to, 1)))
else:
for to, cost in edges[now]:
if minDist[1][to] > dist + cost:
heappush(que, (dist + cost, (to, 1)))
reverseDist = [INF] * N
que = [(0, 0)]
while que:
dist, now = heappop(que)
if reverseDist[now] <= dist:
continue
reverseDist[now] = dist
for to, cost in edges[now]:
if reverseDist[to] > dist + cost:
heappush(que, (dist + cost, to))
print(0)
for i in range(1, N):
ans = minDist[1][i] + reverseDist[i]
print(ans)