結果

問題 No.1639 最小通信路
ユーザー hiragn
提出日時 2022-12-04 02:44:11
言語 Python3
(3.13.1 + numpy 2.2.1 + scipy 1.14.1)
結果
AC  
実行時間 54 ms / 2,000 ms
コード長 2,188 bytes
コンパイル時間 139 ms
コンパイル使用メモリ 12,800 KB
実行使用メモリ 11,136 KB
最終ジャッジ日時 2024-10-11 04:43:52
合計ジャッジ時間 3,244 ms
ジャッジサーバーID
(参考情報)
judge4 / judge2
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 2
other AC * 43
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

class UnionFind:
n = 1
parent_or_size = [-1 for i in range(n)]
def __init__(self, n0):
self.n = n0
self.parent_or_size = [-1 for _ in range(n0)]
def merge(self, a, b):
assert 0 <= a < self.n, "0<=a<n,a={0},n={1}".format(a, self.n)
assert 0 <= b < self.n, "0<=b<n,b={0},n={1}".format(b, self.n)
x = self.leader(a)
y = self.leader(b)
if x == y:
return x
if -self.parent_or_size[x] < -self.parent_or_size[y]:
x, y = y, x
self.parent_or_size[x] += self.parent_or_size[y]
self.parent_or_size[y] = x
return x
def same(self, a, b):
assert 0 <= a < self.n, "0<=a<n,a={0},n={1}".format(a, self.n)
assert 0 <= b < self.n, "0<=b<n,b={0},n={1}".format(b, self.n)
return self.leader(a) == self.leader(b)
def leader(self, a):
assert 0 <= a < self.n, "0<=a<n,a={0},n={1}".format(a, self.n)
if self.parent_or_size[a] < 0:
return a
self.parent_or_size[a] = self.leader(self.parent_or_size[a])
return self.parent_or_size[a]
def size(self, a):
assert 0 <= a < self.n, "0<=a<n,a={0},n={1}".format(a, self.n)
return -self.parent_or_size[self.leader(a)]
def groups(self):
leader_buf = [0 for _ in range(self.n)]
group_size = [0 for _ in range(self.n)]
for i in range(self.n):
leader_buf[i] = self.leader(i)
group_size[leader_buf[i]] += 1
result = [[] for _ in range(self.n)]
for i in range(self.n):
result[leader_buf[i]].append(i)
result2 = []
for i in range(self.n):
if len(result[i]) > 0:
result2.append(result[i])
return result2
def main():
n = int(input())
uf = UnionFind(n)
for _ in range(n * (n - 1) // 2):
a, b, c = map(int, input().split())
a -= 1
b -= 1
if uf.same(a, b): # c
continue
uf.merge(a, b)
if uf.size(0) == n: #
exit(print(c))
if __name__ == "__main__":
main()
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