結果

問題 No.2418 情報通だよ!Nafmoくん
ユーザー Kyoro ID
提出日時 2023-08-12 14:04:00
言語 Python3
(3.13.1 + numpy 2.2.1 + scipy 1.14.1)
結果
AC  
実行時間 420 ms / 2,000 ms
コード長 2,688 bytes
コンパイル時間 179 ms
コンパイル使用メモリ 12,672 KB
実行使用メモリ 53,752 KB
最終ジャッジ日時 2024-11-14 12:23:04
合計ジャッジ時間 6,183 ms
ジャッジサーバーID
(参考情報)
judge3 / 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 * 3
other AC * 21
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

import types
_atcoder_code = """
# Python port of AtCoder Library.
__version__ = '0.0.1'
"""
atcoder = types.ModuleType('atcoder')
exec(_atcoder_code, atcoder.__dict__)
_atcoder_dsu_code = """
import typing
class DSU:
'''
Implement (union by size) + (path halving)
Reference:
Zvi Galil and Giuseppe F. Italiano,
Data structures and algorithms for disjoint set union problems
'''
def __init__(self, n: int = 0) -> None:
self._n = n
self.parent_or_size = [-1] * n
def merge(self, a: int, b: int) -> int:
assert 0 <= a < self._n
assert 0 <= 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: int, b: int) -> bool:
assert 0 <= a < self._n
assert 0 <= b < self._n
return self.leader(a) == self.leader(b)
def leader(self, a: int) -> int:
assert 0 <= a < self._n
parent = self.parent_or_size[a]
while parent >= 0:
if self.parent_or_size[parent] < 0:
return parent
self.parent_or_size[a], a, parent = (
self.parent_or_size[parent],
self.parent_or_size[parent],
self.parent_or_size[self.parent_or_size[parent]]
)
return a
def size(self, a: int) -> int:
assert 0 <= a < self._n
return -self.parent_or_size[self.leader(a)]
def groups(self) -> typing.List[typing.List[int]]:
leader_buf = [self.leader(i) for i in range(self._n)]
result: typing.List[typing.List[int]] = [[] for _ in range(self._n)]
for i in range(self._n):
result[leader_buf[i]].append(i)
return list(filter(lambda r: r, result))
"""
atcoder.dsu = types.ModuleType('atcoder.dsu')
exec(_atcoder_dsu_code, atcoder.dsu.__dict__)
DSU = atcoder.dsu.DSU
import sys
input = sys.stdin.readline
# from atcoder.dsu import DSU
def read():
N, M = map(int, input().strip().split())
AB = []
for i in range(M):
a, b = map(int, input().strip().split())
AB.append((a, b))
return N, M, AB
def solve(N, M, AB):
dsu = DSU(2 * N)
for a, b in AB:
dsu.merge(a-1, b-1)
ans = 0
for group in dsu.groups():
ans += len(group) % 2
ans //= 2
return ans
if __name__ == "__main__":
inputs = read()
outputs = solve(*inputs)
if outputs is not None:
print("%s" % str(outputs))
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