結果

問題 No.3031 曲面の向き付け
ユーザー Yotugi
提出日時 2025-02-21 23:44:40
言語 PyPy3
(7.3.15)
結果
WA  
実行時間 -
コード長 2,252 bytes
コンパイル時間 376 ms
コンパイル使用メモリ 82,392 KB
実行使用メモリ 231,524 KB
最終ジャッジ日時 2025-02-21 23:44:58
合計ジャッジ時間 15,224 ms
ジャッジサーバーID
(参考情報)
judge4 / judge5
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 * 4
other AC * 27 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 #
プレゼンテーションモードにする

from sys import stdin,setrecursionlimit#,set_int_max_str_digits
#import pypyjit
#pypyjit.set_param('max_unroll_recursion=-1')
setrecursionlimit(20000000) #
#set_int_max_str_digits(200010)
mod = 998244353
ii = lambda :int(stdin.readline())
mi = lambda :map(int,stdin.readline().split())
li = lambda :list(mi())
gmi = lambda :map(lambda x: int(x) - 1, stdin.readline().split())
gi = lambda :list(map(lambda x: 0 if x == "." else 1,input())) #
py = lambda :print("Yes")
pn = lambda :print("No")
pf = lambda :print("First")
ps = lambda :print("Second")
vec = [(1,0),(-1,0),(0,-1),(0,1)]
vec1 = [(1,0),(1,1),(0,1),(-1,1),(-1,0),(-1,-1),(0,-1),(1,-1)] #8
inf = 10**18
n = ii()
from collections import defaultdict
data = [li() for _ in range(n)]
cnt = defaultdict(int)
g = defaultdict(list)
for i in range(n):
a,b,c = data[i]
cnt[a,b] += 1
cnt[b,c] += 1
cnt[a,c] += 1
g[a,b].append(i)
g[b,c].append(i)
g[a,c].append(i)
for i in cnt:
if cnt[i] > 2:
print("NO")
exit()
muki = defaultdict(int)
seen = [0]*n
for i in range(n):
if seen[i]:continue
seen[i] = 1
st = [i]
while st:
v = st.pop()
a,b,c = data[v]
flag = 0
if (a,b) in muki:
flag = muki[a,b]
if (b,c) in muki:
if flag and flag != muki[b,c]:
print("NO")
exit()
flag = muki[b,c]
if (a,c) in muki:
if flag and flag != -muki[a,c]:
print("NO")
exit()
flag = -muki[a,c]
if flag == 0:
flag = 1
muki[a,b] = flag
muki[b,c] = flag
muki[a,c] = -flag
for u in g[a,b]:
if seen[u] == 0:
st.append(u)
seen[u] = 1
for u in g[b,c]:
if seen[u] == 0:
st.append(u)
seen[u] = 1
for u in g[a,c]:
if seen[u] == 0:
st.append(u)
seen[u] = 1
for v in range(n):
a,b,c = data[v]
if muki[a,b] == muki[b,c] == -muki[a,c]:
continue
print("NO")
print("YES")
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