結果
問題 | No.1301 Strange Graph Shortest Path |
ユーザー | hiragn |
提出日時 | 2022-12-13 14:09:54 |
言語 | Python3 (3.12.2 + numpy 1.26.4 + scipy 1.12.0) |
結果 |
AC
|
実行時間 | 2,617 ms / 3,000 ms |
コード長 | 2,021 bytes |
コンパイル時間 | 211 ms |
コンパイル使用メモリ | 12,928 KB |
実行使用メモリ | 137,072 KB |
最終ジャッジ日時 | 2024-04-25 00:11:14 |
合計ジャッジ時間 | 13,968 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
(要ログイン)
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 | 27 ms
11,136 KB |
testcase_01 | AC | 27 ms
10,880 KB |
testcase_02 | AC | 2,279 ms
124,916 KB |
testcase_03 | AC | 1,765 ms
111,104 KB |
testcase_04 | AC | 2,583 ms
136,952 KB |
testcase_05 | AC | 1,904 ms
122,880 KB |
testcase_06 | AC | 2,424 ms
125,680 KB |
testcase_07 | AC | 2,343 ms
122,880 KB |
testcase_08 | AC | 1,783 ms
111,568 KB |
testcase_09 | AC | 2,262 ms
119,844 KB |
testcase_10 | AC | 1,807 ms
111,864 KB |
testcase_11 | AC | 2,439 ms
127,716 KB |
testcase_12 | AC | 2,451 ms
129,104 KB |
testcase_13 | AC | 2,262 ms
126,256 KB |
testcase_14 | AC | 2,241 ms
118,416 KB |
testcase_15 | AC | 2,217 ms
118,276 KB |
testcase_16 | AC | 2,617 ms
137,072 KB |
testcase_17 | AC | 2,406 ms
129,896 KB |
testcase_18 | AC | 2,170 ms
118,108 KB |
testcase_19 | AC | 2,387 ms
126,240 KB |
testcase_20 | AC | 2,311 ms
126,800 KB |
testcase_21 | AC | 2,352 ms
126,372 KB |
testcase_22 | AC | 2,420 ms
130,268 KB |
testcase_23 | AC | 2,293 ms
126,612 KB |
testcase_24 | AC | 2,421 ms
126,696 KB |
testcase_25 | AC | 2,494 ms
134,456 KB |
testcase_26 | AC | 2,340 ms
124,332 KB |
testcase_27 | AC | 2,379 ms
126,852 KB |
testcase_28 | AC | 1,955 ms
119,268 KB |
testcase_29 | AC | 2,484 ms
136,572 KB |
testcase_30 | AC | 2,500 ms
132,664 KB |
testcase_31 | AC | 2,476 ms
133,608 KB |
testcase_32 | AC | 29 ms
11,136 KB |
testcase_33 | AC | 1,246 ms
120,928 KB |
testcase_34 | AC | 2,492 ms
129,592 KB |
ソースコード
from heapq import heappush, heappop class MinCostFlow: INF = 10 ** 18 def __init__(self, N): self.N = N self.G = [[] for i in range(N)] def add_edge(self, fr, to, cap, cost): forward = [to, cap, cost, None] backward = forward[3] = [fr, 0, -cost, forward] self.G[fr].append(forward) self.G[to].append(backward) def flow(self, s, t, f): N = self.N; G = self.G INF = MinCostFlow.INF res = 0 H = [0] * N prv_v = [0] * N prv_e = [0] * N d0 = [INF] * N dist = [INF] * N while f: dist[:] = d0 dist[s] = 0 que = [(0, s)] while que: c, v = heappop(que) if dist[v] < c: continue r0 = dist[v] + H[v] for e in G[v]: w, cap, cost, _ = e if cap > 0 and r0 + cost - H[w] < dist[w]: dist[w] = r = r0 + cost - H[w] prv_v[w] = v prv_e[w] = e heappush(que, (r, w)) if dist[t] == INF: return None for i in range(N): H[i] += dist[i] d = f; v = t while v != s: d = min(d, prv_e[v][1]) v = prv_v[v] f -= d res += d * H[t] v = t while v != s: e = prv_e[v] e[1] -= d e[3][1] += d v = prv_v[v] return res def main(): n, m = map(int, input().split()) g = MinCostFlow(n) for _ in range(m): u, v, c, d = map(int, input().split()) u -= 1 v -= 1 g.add_edge(u, v, 1, c) g.add_edge(u, v, 1, d) g.add_edge(v, u, 1, c) g.add_edge(v, u, 1, d) print(g.flow(0, n - 1, 2)) if __name__ == "__main__": main()