結果
| 問題 |
No.1605 Matrix Shape
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2021-07-16 22:04:43 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
RE
|
| 実行時間 | - |
| コード長 | 1,742 bytes |
| コンパイル時間 | 210 ms |
| コンパイル使用メモリ | 82,424 KB |
| 実行使用メモリ | 102,812 KB |
| 最終ジャッジ日時 | 2024-07-06 09:16:57 |
| 合計ジャッジ時間 | 6,086 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 * 1 RE * 2 |
| other | AC * 12 WA * 17 RE * 5 |
ソースコード
n = int(input())
max_ = 2 * 10 ** 5
edges = [[] for _ in range(max_)]
in_cnt = [0] * max_
out_cnt = [0] * max_
for _ in range(n):
h, w = map(int, input().split())
h -= 1
w -= 1
edges[h].append(w)
in_cnt[h] += 1
out_cnt[w] += 1
s = -1
g = -1
for j, (i, o) in enumerate(zip(in_cnt, out_cnt)):
if i == o:
continue
if i == o + 1:
if s == -1:
s = j
else:
print(0)
exit()
elif i + 1 == o:
if g == -1:
g = j
else:
print(0)
exit()
else:
print(0)
exit()
stack = [s]
used = [False] * n
used[s] = True
while stack:
pos = stack.pop()
for npos in edges[pos]:
if used[npos]:
continue
used[npos] = True
for i in range(max_):
if not used[i] and in_cnt[i] != 0:
print(0)
exit()
if s == g == -1:
stack = [h]
used = [False] * n
used[h] = True
while stack:
pos = stack.pop()
for npos in edges[pos]:
if used[npos]:
continue
used[npos] = True
for i in range(max_):
if not used[i] and in_cnt[i] != 0:
print(0)
exit()
ans = 0
for e in edges:
ans += len(set(e))
print(ans)
exit()
cnt = 0
used = [False] * n
stack = [s]
used[s] = True
while stack:
pos = stack.pop()
for npos in edges[pos]:
if used[npos]:
continue
if npos == g:
cnt += 1
continue
used[npos] = True
stack.append(npos)
l = 0
for e in edges:
if g in e: l += 1
if cnt == 1:
print(max(1, l - 1))
else:
print(l)