結果

問題 No.977 アリス仕掛けの摩天楼
ユーザー cozy_sauna
提出日時 2022-03-10 21:36:00
言語 PyPy3
(7.3.15)
結果
WA  
実行時間 -
コード長 4,140 bytes
コンパイル時間 293 ms
コンパイル使用メモリ 82,216 KB
実行使用メモリ 79,456 KB
最終ジャッジ日時 2024-09-14 22:11:24
合計ジャッジ時間 4,810 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
other AC * 24 WA * 2
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 # 

from sys import setrecursionlimit, stdin
from collections import defaultdict, deque
from itertools import permutations, combinations, product
from functools import lru_cache
from random import sample, choice, randint, random
from bisect import bisect_left, bisect_right
from heapq import heappush, heappop
from math import factorial, exp
from copy import copy, deepcopy
from time import time

setrecursionlimit(1 << 20)
readline = stdin.readline
# @lru_cache(maxsize = None)
INF = 10 ** 18
MOD = 998244353
# MOD = 1000000007
DYDX = [(-1, 0), (1, 0), (0, -1), (0, 1)]
ALP = 26
''' Input '''
def I(): return int(readline())
def ST(): return readline()[:-1]
def LI(): return list(map(int, readline().split()))
def LII(): return list(map(lambda x: int(x) - 1, readline().split()))
def SPI(): return map(int, readline().split())
def SPII(): return map(lambda x: int(x) - 1, readline().split())
def FIE(x): return [readline()[:-1] for _ in [0] * x]
def NODE(N, edge):
    node = [[] for _ in [0] * N]
    for _ in [0] * edge:
        a, b = map(int, input().split())
        node[a - 1].append(b - 1)
        node[b - 1].append(a - 1)
    return node 

def NODE_W(N, edge):
    node = [[] for _ in [0] * N]
    for _ in [0] * edge:
        a, b, c = map(int, input().split())
        node[a - 1].append((b - 1, c))
        node[b - 1].append((a - 1, c))
    return node

''' Array '''
def cmin(dp, i, x):
    if x < dp[i]: dp[i] = x
def cmax(dp, i, x):
    if x > dp[i]: dp[i] = x

''' Sorted Array '''
# x <= A[i] (minimum i meeting the requirement)
def binary(sortedA, x): return bisect_left(sortedA, x)
# x < A[i] (minimum i meeting the requirement)
def binary2(sortedA, x): return bisect_right(sortedA, x + 1)
# number of x in A
def quantity(sortedA, x): return bisect_right(sortedA, x) - bisect_left(sortedA, x)

''' Alphabet '''
def id_a(s): return ord(s) - ord('a')
def id_A(s): return ord(s) - ord('A')
def st_a(i): return chr(ord('a') + i)
def st_A(i): return chr(ord('A') + i)

''' Other'''
def ranges(*args): return [(i, j) for i in range(args[0]) for j in range(args[-1])]
def nynx(y, x, ly = INF, lx = INF): return [(y + dy, x + dx) for dy, dx in DYDX if 0 <= y + dy < ly and 0 <= x + dx < lx]
def gen(x, *args):
    ret = [x] * args[-1]
    for e in args[:-1][::-1]: ret = [deepcopy(ret) for _ in [0] * e]
    return ret
def is_prime(x):
    if x == 1 or x % 2 == 0: return x == 2
    f = 3
    while f * f <= x:
        if x % f == 0: return False 
        f += 2
    return True 

''' Output '''
def puts(E):
    for e in E: print(e)
def pprint(E): 
    print()
    for e in E: print(e)
def yn(x): print("Yes" if x else "No")
def blank(arr): print(" ".join(map(str, arr)))
def link(arr): print(''.join(map(str, arr)))
def debug(*args):
    if DEBUG:
        for e in args: print(e)
DEBUG = False
###############################################################################################

class UnionFind():
    def __init__(self, n):
        self.n = n
        self.P = [-1] * n # parents

    def find(self, x):
        if self.P[x] < 0: return x
        self.P[x] = self.find(self.P[x])
        return self.P[x]

    def union(self, x, y):
        x = self.find(x)
        y = self.find(y)
        if x == y: return
        if self.P[x] > self.P[y]: x, y = y, x
        self.P[x] += self.P[y]
        self.P[y] = x

    def size(self, x): return -self.P[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.P) if x < 0]

    def group_count(self): return len(self.roots())

    def all_group_members(self):
        from collections import defaultdict
        G = defaultdict(list)
        for member in range(self.n): G[self.find(member)].append(member)
        return G

    def __str__(self): return '\n'.join(f'{r}: {m}' for r, m in self.all_group_members().items())

N = I()
uni = UnionFind(N)
for _ in range(N - 1):
    y, x = SPI()
    uni.union(y, x)

if uni.group_count() == 1: print("Bob")
else: print("Alice")
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