結果
| 問題 | 
                            No.1390 Get together
                             | 
                    
| コンテスト | |
| ユーザー | 
                             ansain
                         | 
                    
| 提出日時 | 2021-02-12 21:49:32 | 
| 言語 | Python3  (3.13.1 + numpy 2.2.1 + scipy 1.14.1)  | 
                    
| 結果 | 
                             
                                AC
                                 
                             
                            
                         | 
                    
| 実行時間 | 792 ms / 2,000 ms | 
| コード長 | 2,713 bytes | 
| コンパイル時間 | 166 ms | 
| コンパイル使用メモリ | 12,928 KB | 
| 実行使用メモリ | 76,476 KB | 
| 最終ジャッジ日時 | 2024-07-19 21:02:16 | 
| 合計ジャッジ時間 | 14,316 ms | 
| 
                            ジャッジサーバーID (参考情報)  | 
                        judge2 / judge5 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 3 | 
| other | AC * 29 | 
ソースコード
import sys
from collections import defaultdict, Counter, deque
from itertools import permutations, combinations, product, combinations_with_replacement, groupby, accumulate
import operator
from math import sqrt, gcd, factorial
# from math import isqrt, prod,comb  # python3.8用(notpypy)
#from bisect import bisect_left,bisect_right
#from functools import lru_cache,reduce
#from heapq import heappush,heappop,heapify,heappushpop,heapreplace
#import numpy as np
#import networkx as nx
#from networkx.utils import UnionFind
#from numba import njit, b1, i1, i4, i8, f8
#from scipy.sparse import csr_matrix
#from scipy.sparse.csgraph import shortest_path, floyd_warshall, dijkstra, bellman_ford, johnson, NegativeCycleError
# numba例 @njit(i1(i4[:], i8[:, :]),cache=True) 引数i4配列、i8 2次元配列,戻り値i1
def input(): return sys.stdin.readline().rstrip()
def divceil(n, k): return 1+(n-1)//k  # n/kの切り上げを返す
def yn(hantei, yes='Yes', no='No'): print(yes if hantei else no)
#https://note.nkmk.me/python-union-find/から一部改変
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):
        self.all_group_member=defaultdict(list)
        for i in range(self.n):
            self.all_group_member[self.find(i)].append(i)
        return self.all_group_member
    def __str__(self):
        return '\n'.join('{}: {}'.format(r, self.members(r)) for r in self.roots())
def main():
    mod = 10**9+7
    mod2 = 998244353
    n,m=map(int, input().split())
    bc=[list(map(lambda x: int(x)-1, input().split())) for i in range(n)]
    dic=defaultdict(list)
    uf=UnionFind(m)
    for b,c in bc:
        dic[c].append(b)
        if len(dic[c])>1:
            uf.union(*dic[c][-2:])
    print(m-uf.group_count())
        
if __name__ == '__main__':
    main()
            
            
            
        
            
ansain