結果
問題 | No.848 なかよし旅行 |
ユーザー | None |
提出日時 | 2021-04-05 03:42:36 |
言語 | PyPy3 (7.3.15) |
結果 |
WA
|
実行時間 | - |
コード長 | 3,765 bytes |
コンパイル時間 | 272 ms |
コンパイル使用メモリ | 82,176 KB |
実行使用メモリ | 102,100 KB |
最終ジャッジ日時 | 2024-06-09 10:02:45 |
合計ジャッジ時間 | 6,993 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
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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 | AC | 559 ms
102,100 KB |
testcase_01 | AC | 47 ms
60,416 KB |
testcase_02 | WA | - |
testcase_03 | WA | - |
testcase_04 | AC | 41 ms
53,632 KB |
testcase_05 | WA | - |
testcase_06 | WA | - |
testcase_07 | AC | 42 ms
53,376 KB |
testcase_08 | WA | - |
testcase_09 | WA | - |
testcase_10 | WA | - |
testcase_11 | WA | - |
testcase_12 | WA | - |
testcase_13 | AC | 210 ms
81,940 KB |
testcase_14 | WA | - |
testcase_15 | WA | - |
testcase_16 | WA | - |
testcase_17 | WA | - |
testcase_18 | WA | - |
testcase_19 | WA | - |
testcase_20 | AC | 151 ms
77,564 KB |
testcase_21 | WA | - |
testcase_22 | WA | - |
testcase_23 | WA | - |
testcase_24 | AC | 45 ms
53,248 KB |
testcase_25 | WA | - |
testcase_26 | AC | 41 ms
53,504 KB |
testcase_27 | AC | 41 ms
53,376 KB |
testcase_28 | AC | 40 ms
53,248 KB |
testcase_29 | AC | 43 ms
52,992 KB |
ソースコード
class Graph: def __init__(self, n, directed=False, decrement=True, edges=[]): self.n = n self.directed = directed self.decrement = decrement self.edges = [[] for _ in range(self.n)] for x, y, cost in edges: self.add_edge(x, y, cost) def add_edge(self, x, y, cost): if self.decrement: x -= 1 y -= 1 self.edges[x].append((y, cost)) if self.directed == False: self.edges[y].append((x, cost)) def dijkstra(self, start=None, INF=10**18): """ 返り値は 0-indexed !!! :param start: スタート地点 :return: スタート地点から各点への距離のリスト 備考: heqpq の比較のための key は第一引数である点に注意( = heappush(heapq, (key,value)) ) """ res = [INF] * self.n if start is None: start=self.decrement start=start-self.decrement res[start] = 0 next_set = [(0, start)] parents=[-1]*N while next_set: dist, p = heappop(next_set) if res[p] < dist: continue """ここで頂点pまでの最短距離が確定。よって、ここを通るのはN回のみ""" for q, cost in self.edges[p]: temp_d = dist + cost if temp_d < res[q]: res[q] = temp_d parents[q] = p heappush(next_set, (temp_d, q)) return res, parents def draw(self): """ :return: グラフを可視化 """ import matplotlib.pyplot as plt import networkx as nx if self.directed: G = nx.DiGraph() else: G = nx.Graph() for x in range(self.n): for y, cost in self.edges[x]: G.add_edge(x + self.decrement, y + self.decrement, weight=cost) edge_labels = {(i, j): w['weight'] for i, j, w in G.edges(data=True)} pos = nx.spring_layout(G) nx.draw_networkx(G, pos, with_labels=True, connectionstyle='arc3, rad = 0.1') nx.draw_networkx_edge_labels(G, pos, edge_labels=edge_labels) plt.axis("off") plt.show() ######################################################### def example(): global input example = iter( """ 3 3 1 2 1 1 3 1 2 3 3 """ .strip().split("\n")) input = lambda: next(example) def example2(): global input example = iter( """ 6 9 1 2 7 2 3 10 1 3 9 1 6 14 3 6 2 5 6 9 4 5 6 2 4 15 3 4 11 """ .strip().split("\n")) input = lambda: next(example) ######################################################### import sys from heapq import * input = sys.stdin.readline INF = 10**18 # 大きい数字 N, M, P, Q, T = map(int, input().split()) graph = Graph(N, directed=False, decrement=True) for _ in range(M): x, y, cost = map(int, input().split()) graph.add_edge(x, y, cost) dist, par = graph.dijkstra(start=1,INF=INF) distP, parP = graph.dijkstra(start=P,INF=INF) distQ, parQ = graph.dijkstra(start=Q,INF=INF) res=-1 for i in range(N): off = dist[i]*2 t1 = distP[i] t2 = distQ[i] t=max(t1,t2)*2 if off+t>T: continue res=max(T-t,res) if t1<t2: g=i while g!=-1: tp=t2-distQ[g] if off+tp*2+t1*2<=T: res=max(T-distQ[g]*2,res) else: break g=parQ[g] else: g=i while g!=-1: tp=t1-distP[g] if off+tp*2+t2*2<=T: res=max(T-distP[g]*2,res) else: break g=parP[g] if distP[0]+distQ[0]+distP[Q-1]<=T: res=T print(res)