結果

問題 No.1301 Strange Graph Shortest Path
ユーザー marroncastlemarroncastle
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
このコードへのチャレンジ
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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
権限があれば一括ダウンロードができます

ソースコード

diff #

# 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))
0