結果
| 問題 |
No.2301 Namorientation
|
| コンテスト | |
| ユーザー |
mkawa2
|
| 提出日時 | 2023-05-12 22:13:03 |
| 言語 | Python3 (3.13.1 + numpy 2.2.1 + scipy 1.14.1) |
| 結果 |
AC
|
| 実行時間 | 1,254 ms / 3,000 ms |
| コード長 | 2,227 bytes |
| コンパイル時間 | 194 ms |
| コンパイル使用メモリ | 12,800 KB |
| 実行使用メモリ | 98,688 KB |
| 最終ジャッジ日時 | 2024-11-28 18:41:22 |
| 合計ジャッジ時間 | 25,939 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 30 |
ソースコード
import sys
sys.setrecursionlimit(200005)
# sys.set_int_max_str_digits(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
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 = (1 << 63)-1
# md = 10**9+7
md = 998244353
n = II()
to = [[] for _ in range(n)]
uv = []
for _ in range(n):
u, v = LI1()
to[u].append(v)
to[v].append(u)
uv.append((u, v))
isloop = [0]*n
loops = []
vis = [0]*n
def loop(u=0, p=-1):
vis[u] = 1
for v in to[u]:
if v == p: continue
if vis[v] == 0:
s = loop(v, u)
if s != -1:
loops.append(u)
isloop[u] = 1
vis[u] = 2
if s == u: return -1
return s
elif vis[v] == 1:
loops.append(u)
isloop[u] = 1
vis[u] = 2
return v
vis[u] = 2
return -1
loop()
# print(loops)
# print(isloop)
def dfs(root=0):
uu, stack = [], [root]
while stack:
u = stack.pop()
uu.append(u)
for v in to[u]:
if v == parent[u]: continue
if isloop[v]: continue
parent[v] = u
depth[v] = depth[u]+1
stack.append(v)
return uu
parent, depth = [-1]*n, [0]*n
for u in range(n):
if isloop[u]: dfs(u)
pos = {u: p for p, u in enumerate(loops)}
for u, v in uv:
if isloop[u] and isloop[v]:
if (pos[u]+1)%len(loops) == pos[v]:
print("<-")
else:
print("->")
elif isloop[u] and isloop[v] == 0:
print("<-")
elif isloop[u] == 0 and isloop[v]:
print("->")
else:
if depth[u] < depth[v]:
print("<-")
else:
print("->")
mkawa2