結果
問題 | No.19 ステージの選択 |
ユーザー | tnodino |
提出日時 | 2022-02-09 21:23:46 |
言語 | Python3 (3.12.2 + numpy 1.26.4 + scipy 1.12.0) |
結果 |
RE
|
実行時間 | - |
コード長 | 2,113 bytes |
コンパイル時間 | 150 ms |
コンパイル使用メモリ | 12,800 KB |
実行使用メモリ | 21,224 KB |
最終ジャッジ日時 | 2024-06-25 01:36:36 |
合計ジャッジ時間 | 3,233 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | RE | - |
testcase_01 | RE | - |
testcase_02 | RE | - |
testcase_03 | RE | - |
testcase_04 | RE | - |
testcase_05 | RE | - |
testcase_06 | RE | - |
testcase_07 | RE | - |
testcase_08 | RE | - |
testcase_09 | RE | - |
testcase_10 | RE | - |
testcase_11 | RE | - |
testcase_12 | RE | - |
testcase_13 | RE | - |
testcase_14 | RE | - |
testcase_15 | RE | - |
testcase_16 | RE | - |
testcase_17 | RE | - |
testcase_18 | RE | - |
testcase_19 | RE | - |
testcase_20 | RE | - |
testcase_21 | RE | - |
testcase_22 | RE | - |
testcase_23 | RE | - |
ソースコード
from collections import deque from tkinter import Label class StronglyConnectedComponent: def __init__(self, N): self.N = N self.G = [[] for _ in range(N)] self.RevG = [[] for _ in range(N)] def AddEdge(self, u, v): self.G[u].append(v) self.RevG[v].append(u) def dfs(self, u): self.Used[u] = True for v in self.G[u]: if not self.Used[v]: self.dfs(v) self.PostOrder.append(u) def Revdfs(self, u): self.Group[u] = self.Lbcnt self.Used[u] = True for v in self.RevG[u]: if not self.Used[v]: self.Revdfs(v) def Build(self): self.PostOrder = [] self.Used = [False] * self.N for i in range(self.N): if not self.Used[i]: self.dfs(i) self.Used = [False] * self.N self.Group = [None] * self.N self.Lbcnt = 0 for i in reversed(self.PostOrder): if not self.Used[i]: self.Revdfs(i) self.Lbcnt += 1 def Construct(self): DAG = [[] for _ in range(self.Lbcnt)] Groups = [[] for _ in range(self.Lbcnt)] for u in range(self.N): Lbu = self.Group[u] for v in self.G[u]: Lbv = self.Group[v] if Lbu == Lbv: continue DAG[Lbu].append(Lbv) Groups[Lbu].append(u) return DAG, Groups def dfs(u): flg[u] = True ret = 0 for i in Groups[u]: ret += L[i] / 2 for v in DAG[u]: ret += dfs(v) return ret def MinCheck(u): ret = 1<<32 for i in Groups[u]: ret = min(ret, L[i]) return ret / 2 N = int(input()) Z = [list(map(int,input().split())) for _ in range(N)] L,S = [list(i) for i in zip(*Z)] SCC = StronglyConnectedComponent(N) for i in range(N): SCC.AddEdge(S[i]-1, i) SCC.Build() DAG,Groups = SCC.Construct() M = SCC.Lbcnt flg = [False] * M ans = 0 for i in range(M): if not flg[i]: ans += dfs(i) ans += MinCheck(i) print(ans)