#808459 (PyPy3) No.1390 Get together

• 問題: No.1390 Get together
• ユーザー: itsy68
• 提出日時: 2022-10-18 03:56:47
• 言語: PyPy3 (7.3.15)
• 結果: AC
• 実行時間: 396 ms / 2,000 ms
• コード長: 2,061 bytes
• コンパイル時間: 156 ms
• コンパイル使用メモリ: 82,432 KB
• 実行使用メモリ: 97,792 KB
• 最終ジャッジ日時: 2024-06-28 14:52:59
• 合計ジャッジ時間: 9,191 ms
• ジャッジサーバーID （参考情報）: judge3 / judge1

ファイルパターン	結果
sample	AC * 3
other	AC * 29

ソースコード

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import sys
from itertools import combinations, permutations, product, accumulate, groupby
from collections import defaultdict, deque, Counter
from functools import reduce
import heapq
import bisect
import math
import copy
sys.setrecursionlimit(10 ** 9)
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
INF = float("inf")
MOD = 10 ** 9 + 7
# DFS
# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')
class UnionFind():
    def __init__(self, n):
        self.n = n
        self.parents = [-1] * n
    def find(self, x):
        if self.parents[x] < 0:
            return x
        else:
            self.parents[x] = self.find(self.parents[x])
            return self.parents[x]
    def union(self, x, y):
        x = self.find(x)
        y = self.find(y)
        if x == y:
            return
        if self.parents[x] > self.parents[y]:
            x, y = y, x
        self.parents[x] += self.parents[y]
        self.parents[y] = x
    def size(self, x):
        return -self.parents[self.find(x)]
    def same(self, x, y):
        return self.find(x) == self.find(y)
    def members(self, x):
        root = self.find(x)
        return [i for i in range(self.n) if self.find(i) == root]
    def roots(self):
        return [i for i, x in enumerate(self.parents) if x < 0]
    def group_count(self):
        return len(self.roots())
    def all_group_members(self):
        group_members = defaultdict(list)
        for member in range(self.n):
            group_members[self.find(member)].append(member)
        return group_members
    def __str__(self):
        return '\n'.join(f'{r}: {m}' for r, m in self.all_group_members().items())
# 0-indexed
N, M = map(int, input().split())
uf = UnionFind(M)
L = [[] for i in range(N)]
for i in range(N):
    b, c = mi()
    b-=1
    c-=1
    L[c].append(b)
cnt = 0
for l in L:
    for b in l:
        if not uf.same(l[0], b):
            uf.union(l[0], b)
            cnt += 1
print(cnt)            
 
 
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