#822412 (Python3) No.1639 最小通信路

• 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

ファイルパターン	結果
sample	AC * 2
other	AC * 43

ソースコード

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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は降順なので初回につなぐ
            continue
        uf.merge(a, b)
        if uf.size(0) == n:  # 全部つながったら終わり。
            exit(print(c))
if __name__ == "__main__":
    main()
 
 
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