結果
問題 |
No.1814 Uribo Road (Easy)
|
ユーザー |
![]() |
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()