結果
問題 | No.1301 Strange Graph Shortest Path |
ユーザー | marroncastle |
提出日時 | 2020-11-29 20:21:46 |
言語 | PyPy3 (7.3.15) |
結果 |
WA
|
実行時間 | - |
コード長 | 1,722 bytes |
コンパイル時間 | 266 ms |
コンパイル使用メモリ | 82,200 KB |
実行使用メモリ | 179,576 KB |
最終ジャッジ日時 | 2024-09-13 02:08:18 |
合計ジャッジ時間 | 18,494 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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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 | 40 ms
61,320 KB |
testcase_01 | AC | 39 ms
53,264 KB |
testcase_02 | WA | - |
testcase_03 | WA | - |
testcase_04 | WA | - |
testcase_05 | WA | - |
testcase_06 | WA | - |
testcase_07 | WA | - |
testcase_08 | WA | - |
testcase_09 | WA | - |
testcase_10 | WA | - |
testcase_11 | WA | - |
testcase_12 | WA | - |
testcase_13 | WA | - |
testcase_14 | WA | - |
testcase_15 | WA | - |
testcase_16 | WA | - |
testcase_17 | WA | - |
testcase_18 | WA | - |
testcase_19 | WA | - |
testcase_20 | WA | - |
testcase_21 | WA | - |
testcase_22 | WA | - |
testcase_23 | WA | - |
testcase_24 | WA | - |
testcase_25 | WA | - |
testcase_26 | WA | - |
testcase_27 | WA | - |
testcase_28 | WA | - |
testcase_29 | WA | - |
testcase_30 | WA | - |
testcase_31 | WA | - |
testcase_32 | AC | 37 ms
52,876 KB |
testcase_33 | AC | 450 ms
175,396 KB |
testcase_34 | TLE | - |
ソースコード
# 最小費用流(minimum cost flow) BellmanFord O(FEV) class MinCostFlow: def __init__(self, n): self.n = n self.G = [[] for i in range(n)] def add_edge(self, f, t, cap, cost): # [to, cap, cost, rev] self.G[f].append([t, cap, 0, cost, len(self.G[t])]) self.G[t].append([f, 0, 0, -cost, len(self.G[f])-1]) def minCostFlow(self, s, t, f): n = self.n G = self.G prevv = [0]*n; preve = [0]*n INF = 10**9+7 res = 0 while f: dist = [INF]*n dist[s] = 0 update = 1 while update: update = 0 for v in range(n): if dist[v] == INF: continue gv = G[v] for i in range(len(gv)): to, cap, flow, cost, rev = gv[i] if cap > 0 and dist[v] + cost < dist[to]: dist[to] = dist[v] + cost prevv[to] = v; preve[to] = i update = 1 if dist[t] == INF: return -1 d = f; v = t while v != s: d = min(d, G[prevv[v]][preve[v]][1]) v = prevv[v] f -= d res += d * dist[t] v = t while v != s: e = G[prevv[v]][preve[v]] e[1] -= d if G[v][e[4]][2]==0: e[2] += d else: G[v][e[4]][2] -= d G[v][e[4]][1] += d v = prevv[v] return res import sys,os,io input = sys.stdin.readline #input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline n, m = map(int, input().split()) graph = MinCostFlow(n) for i in range(m): u, v, c, d = map(int, input().split()) graph.add_edge(u-1, v-1, 1, c) graph.add_edge(v-1, u-1, 1, c) graph.add_edge(u-1, v-1, 1, d) graph.add_edge(v-1, u-1, 1, d) print(graph.minCostFlow(0, n-1, 2))