結果
問題 | No.1301 Strange Graph Shortest Path |
ユーザー |
![]() |
提出日時 | 2020-11-27 23:58:14 |
言語 | Python3 (3.12.2 + numpy 1.26.4 + scipy 1.12.0) |
結果 |
TLE
|
実行時間 | - |
コード長 | 3,143 bytes |
コンパイル時間 | 142 ms |
コンパイル使用メモリ | 11,024 KB |
実行使用メモリ | 165,560 KB |
最終ジャッジ日時 | 2023-10-09 22:10:37 |
合計ジャッジ時間 | 96,789 ms |
ジャッジサーバーID (参考情報) |
judge12 / judge14 |
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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 | 18 ms
8,472 KB |
testcase_01 | AC | 17 ms
8,632 KB |
testcase_02 | AC | 2,788 ms
149,004 KB |
testcase_03 | AC | 2,312 ms
132,132 KB |
testcase_04 | TLE | - |
testcase_05 | AC | 2,469 ms
147,712 KB |
testcase_06 | TLE | - |
testcase_07 | AC | 2,780 ms
146,744 KB |
testcase_08 | AC | 2,412 ms
133,176 KB |
testcase_09 | AC | 2,594 ms
138,992 KB |
testcase_10 | AC | 2,290 ms
132,752 KB |
testcase_11 | AC | 2,872 ms
150,308 KB |
testcase_12 | AC | 2,898 ms
151,332 KB |
testcase_13 | AC | 2,789 ms
150,216 KB |
testcase_14 | TLE | - |
testcase_15 | AC | 2,552 ms
138,892 KB |
testcase_16 | TLE | - |
testcase_17 | TLE | - |
testcase_18 | AC | 2,759 ms
141,164 KB |
testcase_19 | AC | 2,740 ms
147,644 KB |
testcase_20 | AC | 2,989 ms
147,736 KB |
testcase_21 | TLE | - |
testcase_22 | TLE | - |
testcase_23 | AC | 2,891 ms
150,848 KB |
testcase_24 | TLE | - |
testcase_25 | TLE | - |
testcase_26 | AC | 2,944 ms
147,140 KB |
testcase_27 | AC | 2,750 ms
148,464 KB |
testcase_28 | AC | 2,459 ms
142,608 KB |
testcase_29 | TLE | - |
testcase_30 | TLE | - |
testcase_31 | TLE | - |
testcase_32 | AC | 18 ms
8,540 KB |
testcase_33 | AC | 1,744 ms
146,272 KB |
testcase_34 | TLE | - |
ソースコード
import heapq import sys input = sys.stdin.buffer.readline sys.setrecursionlimit(10 ** 7) class MCF_graph(object): def __init__(self, n): self.n = n self.g = [[] for _ in range(n)] # to, rev, cap, cost self.pos = [] def add_edge(self, frm, to, cap, cost): m = len(self.pos) self.pos.append((frm, len(self.g[frm]))) self.g[frm].append([to, len(self.g[to]), cap, cost]) self.g[to].append([frm, len(self.g[frm]) - 1, 0, -cost]) return m def __get_edge(self, i): e_to, e_rev, e_cap, e_cost = self.g[self.pos[i][0]][self.pos[i][1]] re_to, _, re_cap, _ = self.g[e_to][e_rev] # from, to, cap, flow, cost return (re_to, e_to, e_cap + re_cap, re_cap, e_cost) def edges(self): m = len(self.pos) for i in range(m): yield self.__get_edge(i) def flow(self, s, t, flow_limit=10**18): return self.slope(s, t, flow_limit)[-1] def slope(self, s, t, flow_limit=10**18): dual = [0] * self.n flow = 0 cost = 0 prev_cost = -1 result = [(0, 0)] # cap, cost while flow < flow_limit: # call dual_ref() dist = [10**18] * self.n pv = [-1] * self.n pe = [-1] * self.n vis = [False] * self.n dist[s] = 0 que = [(0, s)] while que: _, v = heapq.heappop(que) if vis[v]: continue vis[v] = True if v == t: break for i, (e_to, _, e_cap, e_cost) in enumerate(self.g[v]): if vis[e_to] or (not e_cap): continue tmp_cost = e_cost - dual[e_to] + dual[v] if dist[e_to] > dist[v] + tmp_cost: dist[e_to] = dist[v] + tmp_cost pv[e_to] = v pe[e_to] = i heapq.heappush(que, (dist[e_to], e_to)) if not vis[t]: break for v, visited in enumerate(vis): if not visited: continue dual[v] -= dist[t] - dist[v] # end dual_ref() c = flow_limit - flow v = t while v != s: c = min(c, self.g[pv[v]][pe[v]][2]) v = pv[v] v = t while v != s: i, j = pv[v], pe[v] self.g[i][j][2] -= c self.g[v][self.g[i][j][1]][2] += c v = i d = -dual[s] flow += c cost += c * d if prev_cost == d: result.pop() result.append((flow, cost)) prev_cost = cost return result n, m = map(int, input().split()) g = MCF_graph(n) for _ in range(m): a, b, c, d = map(int, input().split()) a -= 1 b -= 1 g.add_edge(a, b, 1, c) g.add_edge(a, b, 1, d) g.add_edge(b, a, 1, c) g.add_edge(b, a, 1, d) res = g.flow(0, n - 1, 2)[-1] print(res)