結果
問題 | No.1301 Strange Graph Shortest Path |
ユーザー | 👑 rin204 |
提出日時 | 2022-11-02 16:21:09 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 1,271 ms / 3,000 ms |
コード長 | 1,864 bytes |
コンパイル時間 | 287 ms |
コンパイル使用メモリ | 82,048 KB |
実行使用メモリ | 211,524 KB |
最終ジャッジ日時 | 2024-07-17 05:37:27 |
合計ジャッジ時間 | 36,733 ms |
ジャッジサーバーID (参考情報) |
judge1 / 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 | AC | 38 ms
52,352 KB |
testcase_01 | AC | 41 ms
52,608 KB |
testcase_02 | AC | 1,045 ms
200,916 KB |
testcase_03 | AC | 993 ms
186,792 KB |
testcase_04 | AC | 1,185 ms
205,284 KB |
testcase_05 | AC | 1,052 ms
203,660 KB |
testcase_06 | AC | 1,050 ms
195,444 KB |
testcase_07 | AC | 1,089 ms
197,604 KB |
testcase_08 | AC | 1,034 ms
188,284 KB |
testcase_09 | AC | 988 ms
189,148 KB |
testcase_10 | AC | 962 ms
188,096 KB |
testcase_11 | AC | 1,271 ms
199,688 KB |
testcase_12 | AC | 1,117 ms
199,628 KB |
testcase_13 | AC | 1,078 ms
202,000 KB |
testcase_14 | AC | 1,016 ms
188,740 KB |
testcase_15 | AC | 1,057 ms
191,248 KB |
testcase_16 | AC | 1,168 ms
205,492 KB |
testcase_17 | AC | 1,102 ms
203,976 KB |
testcase_18 | AC | 1,178 ms
192,836 KB |
testcase_19 | AC | 1,098 ms
196,200 KB |
testcase_20 | AC | 1,046 ms
193,468 KB |
testcase_21 | AC | 1,060 ms
201,212 KB |
testcase_22 | AC | 1,157 ms
196,708 KB |
testcase_23 | AC | 1,028 ms
202,240 KB |
testcase_24 | AC | 1,084 ms
195,112 KB |
testcase_25 | AC | 1,185 ms
205,208 KB |
testcase_26 | AC | 1,071 ms
196,756 KB |
testcase_27 | AC | 1,124 ms
198,856 KB |
testcase_28 | AC | 936 ms
197,200 KB |
testcase_29 | AC | 1,116 ms
203,900 KB |
testcase_30 | AC | 1,246 ms
204,692 KB |
testcase_31 | AC | 1,142 ms
203,668 KB |
testcase_32 | AC | 41 ms
52,736 KB |
testcase_33 | AC | 514 ms
194,176 KB |
testcase_34 | AC | 1,210 ms
211,524 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 = [None]*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 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(v, u, 1, c) G.add_edge(u, v, 1, d) G.add_edge(v, u, 1, d) print(G.flow(0, n - 1, 2))