結果
問題 |
No.2179 Planet Traveler
|
ユーザー |
![]() |
提出日時 | 2025-04-16 16:19:34 |
言語 | PyPy3 (7.3.15) |
結果 |
WA
|
実行時間 | - |
コード長 | 1,398 bytes |
コンパイル時間 | 144 ms |
コンパイル使用メモリ | 82,532 KB |
実行使用メモリ | 124,164 KB |
最終ジャッジ日時 | 2025-04-16 16:21:10 |
合計ジャッジ時間 | 4,318 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 25 WA * 1 |
ソースコード
import math import heapq def main(): n = int(input()) planets = [] for _ in range(n): x, y, t = map(int, input().split()) r = math.hypot(x, y) planets.append((x, y, t, r)) # Build adjacency list adj = [[] for _ in range(n)] for i in range(n): x_i, y_i, t_i, r_i = planets[i] for j in range(n): if i == j: continue x_j, y_j, t_j, r_j = planets[j] if t_i == t_j: dx = x_i - x_j dy = y_i - y_j d_sq = dx * dx + dy * dy else: d_sq = (r_i - r_j) ** 2 adj[i].append((j, d_sq)) # Dijkstra's algorithm to find minimal maximum edge weight dist = [math.inf] * n dist[0] = 0.0 # Starting at planet 1 (index 0) heap = [] heapq.heappush(heap, (0.0, 0)) while heap: current_max, u = heapq.heappop(heap) if u == n - 1: print(math.ceil(current_max)) return if current_max > dist[u]: continue for v, weight in adj[u]: new_max = max(current_max, weight) if new_max < dist[v]: dist[v] = new_max heapq.heappush(heap, (new_max, v)) # If no path found (though problem states it's possible) print(-1) if __name__ == "__main__": main()