結果
問題 |
No.1364 [Renaming] Road to Cherry from Zelkova
|
ユーザー |
![]() |
提出日時 | 2021-01-22 22:08:48 |
言語 | PyPy3 (7.3.15) |
結果 |
WA
|
実行時間 | - |
コード長 | 1,582 bytes |
コンパイル時間 | 425 ms |
コンパイル使用メモリ | 82,176 KB |
実行使用メモリ | 161,116 KB |
最終ジャッジ日時 | 2024-12-28 01:15:35 |
合計ジャッジ時間 | 13,417 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 17 WA * 28 |
ソースコード
import sys input = sys.stdin.buffer.readline def topological_sorted(digraph): n = len(digraph) indegree = [0] * n for v in range(n): for nxt_v in digraph[v]: indegree[nxt_v] += 1 tp_order = [i for i in range(n) if indegree[i] == 0] stack = tp_order[:] while stack: v = stack.pop() for nxt_v in digraph[v]: indegree[nxt_v] -= 1 if indegree[nxt_v] == 0: stack.append(nxt_v) tp_order.append(nxt_v) return len(tp_order) == n, tp_order n, m = map(int, input().split()) edges = [list(map(int, input().split())) for i in range(m)] MOD = 10 ** 9 + 7 graph = [[] for i in range(n + 1)] for u, v, _, _ in edges: graph[u].append(v) root = 0 reach = [False] * (n + 1) reach[0] = True stack = [root] while stack: v = stack.pop() for nxt_v in graph[v]: if reach[nxt_v]: continue reach[nxt_v] = True stack.append(nxt_v) graph = [set() for i in range(n + 1)] memo = {} for u, v, l, a in edges: if reach[u] and reach[v]: graph[u].add(v) if (u, v) not in memo: memo[u, v] = [] memo[u, v].append((l, a)) flag, tp_order = topological_sorted(graph) if not flag: print("INF") exit() ptn = [0] * (n + 1) ans = [0] * (n + 1) ptn[0] = 1 for v in tp_order: for nxt_v in graph[v]: for l, a in memo[v, nxt_v]: ptn[nxt_v] += ptn[v] * a ans[nxt_v] += l * a * ptn[v] ptn[nxt_v] %= MOD ans[nxt_v] %= MOD print(sum(ans) % MOD)