結果

問題 No.1153 ねこちゃんゲーム
ユーザー mkawa2
提出日時 2021-10-13 18:19:22
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 996 ms / 2,500 ms
コード長 2,405 bytes
コンパイル時間 153 ms
コンパイル使用メモリ 82,236 KB
実行使用メモリ 186,016 KB
最終ジャッジ日時 2024-09-17 16:20:45
合計ジャッジ時間 36,728 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge3
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
sample AC * 2
other AC * 40
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 sys
# sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = 10**16
# md = 998244353
md = 10**9+7
from collections import Counter
n, m = LI()
aa = LI1()
to = [[] for _ in range(n)]
for _ in range(n-1):
    u, v = LI1()
    to[u].append(v)
    to[v].append(u)
# ***************ここから本体*****************
# 設定
root = 0
e = lambda: set()  # 単位元
def op(a, b):
    if isinstance(b, set): return a | b
    a.add(b)
    return a
def trans_up(u):
    for a in range(n):
        if a not in dp[u]:
            dp[u] = a
            return
def trans_down(u):
    for a in range(n):
        if a not in rdp[u]:
            rdp[u] = a
            return
# dfs順を作る
uu = []
stack = [root]
par = [-1]*n
while stack:
    u = stack.pop()
    uu.append(u)
    vv = []
    # ↓変数注意
    for v in to[u]:
        if v == par[u]: continue
        vv.append(v)
        par[v] = u
        stack.append(v)
    to[u] = vv
# print("to",to)
# print("par",par)
dp = [e() for _ in range(n)]
rdp = [0 for _ in range(n)]
# 下から更新
for u in uu[::-1]:
    p = par[u]
    if p != -1:
        trans_up(u)
        dp[p] = op(dp[p], dp[u])
# print("dp",dp)
# 上から更新
gg = [-1]*n
for u in uu:
    cnt = Counter(dp[v] for v in to[u])
    if u != root: cnt[rdp[u]] += 1
    for g in range(n):
        if cnt[g] == 0:
            gg[u] = g
            break
    for v in to[u]:
        if cnt[dp[v]] == 1 and dp[v] < gg[u]:
            rdp[v] = dp[v]
        else:
            rdp[v] = gg[u]
# print(gg)
g = 0
for a in aa: g ^= gg[a]
# print(g)
if g == 0:
    print(-1, -1)
    exit()
ln = g.bit_length()-1
for i, a in enumerate(aa):
    if gg[a] >> ln & 1 == 0: continue
    for v in to[a]:
        if g ^ gg[a] ^ dp[v] == 0:
            print(i+1, v+1)
            exit()
    if a != root and g ^ gg[a] ^ rdp[a] == 0:
        print(i+1, par[a]+1)
        exit()
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