結果
| 問題 |
No.2179 Planet Traveler
|
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-04-15 23:28:32 |
| 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 | 250 ms |
| コンパイル使用メモリ | 81,516 KB |
| 実行使用メモリ | 124,308 KB |
| 最終ジャッジ日時 | 2025-04-15 23:29:58 |
| 合計ジャッジ時間 | 4,242 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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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()
lam6er