結果
問題 | No.1301 Strange Graph Shortest Path |
ユーザー | marroncastle |
提出日時 | 2020-11-29 20:19:48 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 1,217 ms / 3,000 ms |
コード長 | 1,792 bytes |
コンパイル時間 | 353 ms |
コンパイル使用メモリ | 82,600 KB |
実行使用メモリ | 218,020 KB |
最終ジャッジ日時 | 2024-09-13 02:07:55 |
合計ジャッジ時間 | 35,570 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 | 40 ms
54,052 KB |
testcase_01 | AC | 39 ms
54,260 KB |
testcase_02 | AC | 985 ms
206,212 KB |
testcase_03 | AC | 962 ms
191,148 KB |
testcase_04 | AC | 1,161 ms
211,172 KB |
testcase_05 | AC | 1,042 ms
208,996 KB |
testcase_06 | AC | 1,002 ms
200,564 KB |
testcase_07 | AC | 1,027 ms
202,340 KB |
testcase_08 | AC | 980 ms
193,096 KB |
testcase_09 | AC | 951 ms
193,408 KB |
testcase_10 | AC | 909 ms
191,676 KB |
testcase_11 | AC | 1,196 ms
204,852 KB |
testcase_12 | AC | 1,089 ms
204,592 KB |
testcase_13 | AC | 1,047 ms
207,300 KB |
testcase_14 | AC | 1,003 ms
193,856 KB |
testcase_15 | AC | 1,025 ms
196,184 KB |
testcase_16 | AC | 1,136 ms
210,852 KB |
testcase_17 | AC | 1,040 ms
209,628 KB |
testcase_18 | AC | 1,103 ms
197,888 KB |
testcase_19 | AC | 1,075 ms
201,724 KB |
testcase_20 | AC | 1,008 ms
198,484 KB |
testcase_21 | AC | 1,020 ms
206,096 KB |
testcase_22 | AC | 1,113 ms
202,004 KB |
testcase_23 | AC | 1,005 ms
207,680 KB |
testcase_24 | AC | 1,057 ms
200,560 KB |
testcase_25 | AC | 1,155 ms
211,124 KB |
testcase_26 | AC | 1,040 ms
202,268 KB |
testcase_27 | AC | 1,067 ms
203,932 KB |
testcase_28 | AC | 893 ms
202,040 KB |
testcase_29 | AC | 1,080 ms
209,388 KB |
testcase_30 | AC | 1,217 ms
210,376 KB |
testcase_31 | AC | 1,121 ms
209,204 KB |
testcase_32 | AC | 40 ms
53,388 KB |
testcase_33 | AC | 496 ms
200,964 KB |
testcase_34 | AC | 1,208 ms
218,020 KB |
ソースコード
# Dijkstra O(FElog(V)) 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, 0, cost, None] backward = forward[4] = [fr, 0, 0, -cost, forward] self.G[fr].append(forward) self.G[to].append(backward) def minCostFlow(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 -1 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 if e[4][2]==0: e[2] += d else: e[4][2] -= d e[4][1] += d v = prv_v[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))