結果
| 問題 |
No.1814 Uribo Road (Easy)
|
| ユーザー |
lam6er
|
| 提出日時 | 2025-03-20 21:04:37 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 219 ms / 2,000 ms |
| コード長 | 1,563 bytes |
| コンパイル時間 | 211 ms |
| コンパイル使用メモリ | 82,280 KB |
| 実行使用メモリ | 87,076 KB |
| 最終ジャッジ日時 | 2025-03-20 21:04:50 |
| 合計ジャッジ時間 | 5,846 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 44 |
ソースコード
import heapq
def main():
import sys
input = sys.stdin.read
data = input().split()
idx = 0
N = int(data[idx])
idx +=1
M = int(data[idx])
idx +=1
K = int(data[idx])
idx +=1
R = list(map(int, data[idx:idx+K]))
idx += K
R_map = {}
for i in range(K):
road_idx = R[i]
R_map[road_idx] = i
adj = [[] for _ in range(N+1)]
roads = []
for j in range(M):
A = int(data[idx])
idx +=1
B = int(data[idx])
idx +=1
C = int(data[idx])
idx +=1
adj[A].append((B, C, j+1)) # roads are 1-based
adj[B].append((A, C, j+1))
target_mask = (1 << K) -1
INF = float('inf')
distance = [[INF] * (1 << K) for _ in range(N+1)]
distance[1][0] = 0
heap = []
heapq.heappush(heap, (0, 1, 0))
found = False
while heap:
d, u, mask = heapq.heappop(heap)
if u == N and mask == target_mask:
print(d)
found = True
break
if d > distance[u][mask]:
continue
for (v, cost, road_j) in adj[u]:
if road_j in R_map:
bit = R_map[road_j]
new_mask = mask | (1 << bit)
else:
new_mask = mask
new_d = d + cost
if new_d < distance[v][new_mask]:
distance[v][new_mask] = new_d
heapq.heappush(heap, (new_d, v, new_mask))
if not found:
print(-1)
if __name__ == "__main__":
main()
lam6er