結果
問題 |
No.1647 Travel in Mitaru city 2
|
ユーザー |
![]() |
提出日時 | 2021-08-13 23:31:07 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 421 ms / 2,500 ms |
コード長 | 1,750 bytes |
コンパイル時間 | 1,673 ms |
コンパイル使用メモリ | 81,664 KB |
実行使用メモリ | 131,592 KB |
最終ジャッジ日時 | 2024-10-13 03:23:44 |
合計ジャッジ時間 | 18,926 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 48 |
ソースコード
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 h, w, n = LI() to = [[] for _ in range(h+w)] xytoi = {} for i in range(n): x, y = LI1() y += h to[x].append(y) to[y].append(x) xytoi[x, y] = i vis = [0]*(h+w) def dfs(u): stack = [(u, -1, True)] res = [] while stack: u, par, first = stack.pop() if first: vis[u] = 1 stack.append((u, par, False)) for v in to[u]: if v == par: continue if vis[v] == 2: continue if vis[v] == 1: res = [v, u, par] break stack.append((v, u, True)) else: if res and res[-1] == u: res.append(par) if res and res[0] == res[-1]: return res vis[u] = 2 ans = [] for u in range(h): if vis[u]: continue uu = dfs(u) if uu: for u0, u1 in zip(uu, uu[1:]): if u0 > u1: u0, u1 = u1, u0 i = xytoi[u0, u1] ans.append(i+1) if uu[0] > uu[1]: ans = [ans[-1]]+ans[:-1] break if ans: print(len(ans)) print(*ans) else: print(-1)