結果
問題 | No.96 圏外です。 |
ユーザー |
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提出日時 | 2015-08-31 00:30:29 |
言語 | Python3 (3.13.1 + numpy 2.2.1 + scipy 1.14.1) |
結果 |
AC
|
実行時間 | 4,902 ms / 5,000 ms |
コード長 | 2,391 bytes |
コンパイル時間 | 128 ms |
コンパイル使用メモリ | 13,056 KB |
実行使用メモリ | 263,252 KB |
最終ジャッジ日時 | 2024-07-18 15:49:02 |
合計ジャッジ時間 | 37,447 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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ファイルパターン | 結果 |
---|---|
other | AC * 28 |
ソースコード
from collections import defaultdictfrom itertools import combinationsimport mathclass UnionFind:def __init__(self, n):self.par = list(range(n))def find(self, x):if self.par[x] == x:return xelse:self.par[x] = self.find(self.par[x])return self.par[x]def union(self, x, y):x = self.find(x)y = self.find(y)if x == y:returnself.par[x] = ydef convex_hull(P):def veccross(A, B, C):return (C[0] - A[0]) * (B[1] - A[1]) - (C[1] - A[1]) * (B[0] - A[0])n = len(P)if n <= 2:return list(range(n))ps = [None] * nfor i in range(n):ps[i] = (P[i], i)ps.sort()k = 0res = [0] * (n * 2)for i in range(n):while k > 1 and veccross(P[res[k - 2]], P[res[k - 1]], ps[i][0]) <= 0:k -= 1res[k] = ps[i][1]k += 1t = kfor i in range(n - 2, -1, -1):while k > t and veccross(P[res[k - 2]], P[res[k - 1]], ps[i][0]) <= 0:k -= 1res[k] = ps[i][1]k += 1return res[:k - 1]def m_dist(g, xs, ys):ps = [(xs[i], ys[i]) for i in g]os = convex_hull(ps)ma = 0for i, j in combinations(os, 2):ma = max(ma, (ps[i][0] - ps[j][0]) ** 2 + (ps[i][1] - ps[j][1]) ** 2)return madef solve():N = int(input())XS = [0] * NYS = [0] * NB = defaultdict(list)def b(x, y):if 0 <= x <= 2000 and 0 <= y <= 2000:return B[x, y]else:return []ds = [(-1, -1), (0, -1), (1, -1), (-1, 0), (0, 0), (1, 0), (-1, 1), (0, 1), (1, 1)]uf = UnionFind(N)for i in range(N):x, y = map(int, input().split())x += 10000y += 10000XS[i] = xYS[i] = yx10 = x // 10y10 = y // 10for dx, dy in ds:for j in b(x10 + dx, y10 + dy):if (x - XS[j]) ** 2 + (y - YS[j]) ** 2 <= 100:uf.union(i, j)B[x10, y10].append(i)gd = defaultdict(list)for i in range(N):gd[uf.find(i)].append(i)if len(gd) == 0:print(1)else:ma = 0for g in gd.values():ma = max(ma, m_dist(g, XS, YS))print(math.sqrt(ma) + 2)if __name__ == '__main__':solve()