結果
問題 | No.119 旅行のツアーの問題 |
ユーザー | maspy |
提出日時 | 2020-03-25 22:16:55 |
言語 | Python3 (3.12.2 + numpy 1.26.4 + scipy 1.12.0) |
結果 |
AC
|
実行時間 | 34 ms / 5,000 ms |
コード長 | 3,495 bytes |
コンパイル時間 | 329 ms |
コンパイル使用メモリ | 13,056 KB |
実行使用メモリ | 11,392 KB |
最終ジャッジ日時 | 2024-06-10 11:53:40 |
合計ジャッジ時間 | 1,895 ms |
ジャッジサーバーID (参考情報) |
judge4 / 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 | 31 ms
10,880 KB |
testcase_01 | AC | 33 ms
11,136 KB |
testcase_02 | AC | 31 ms
11,136 KB |
testcase_03 | AC | 31 ms
11,008 KB |
testcase_04 | AC | 30 ms
11,008 KB |
testcase_05 | AC | 32 ms
10,880 KB |
testcase_06 | AC | 32 ms
11,264 KB |
testcase_07 | AC | 31 ms
11,008 KB |
testcase_08 | AC | 31 ms
11,008 KB |
testcase_09 | AC | 31 ms
11,136 KB |
testcase_10 | AC | 31 ms
10,880 KB |
testcase_11 | AC | 31 ms
11,008 KB |
testcase_12 | AC | 30 ms
10,880 KB |
testcase_13 | AC | 31 ms
11,008 KB |
testcase_14 | AC | 30 ms
10,880 KB |
testcase_15 | AC | 30 ms
11,008 KB |
testcase_16 | AC | 32 ms
11,392 KB |
testcase_17 | AC | 31 ms
10,880 KB |
testcase_18 | AC | 31 ms
11,136 KB |
testcase_19 | AC | 31 ms
10,880 KB |
testcase_20 | AC | 33 ms
11,136 KB |
testcase_21 | AC | 33 ms
11,008 KB |
testcase_22 | AC | 34 ms
11,264 KB |
ソースコード
#!/usr/bin/ python3.8 import sys read = sys.stdin.buffer.read readline = sys.stdin.buffer.readline readlines = sys.stdin.buffer.readlines from collections import deque class Dinic: def __init__(self, N, source, sink): self.N = N self.G = [[] for _ in range(N)] self.source = source self.sink = sink def add_edge(self, fr, to, cap): n1 = len(self.G[fr]) n2 = len(self.G[to]) self.G[fr].append([to, cap, n2]) self.G[to].append([fr, 0, n1]) # 逆辺を cap 0 で追加 def add_edge_undirected(self, fr, to, cap): n1 = len(self.G[fr]) n2 = len(self.G[to]) self.G[fr].append([to, cap, n2]) self.G[to].append([fr, cap, n1]) def bfs(self): level = [0] * self.N G = self.G source = self.source sink = self.sink q = deque([source]) level[source] = 1 pop = q.popleft append = q.append while q: v = pop() lv = level[v] + 1 for to, cap, rev in G[v]: if not cap: continue if level[to]: continue level[to] = lv if to == sink: self.level = level return append(to) self.level = level def dfs(self): INF = 10**18 G = self.G sink = self.sink prog = self.progress level = self.level ascend = False ff = 0 stack = [(self.source, INF)] while stack: if ff: # このまま更新だけして戻っていく v, f = stack.pop() p = prog[v] to, cap, rev = G[v][p] G[v][p][1] -= ff G[to][rev][1] += ff continue v, f = stack[-1] if v == sink: ff = f stack.pop() continue E = G[v] lv = level[v] if ascend: # 流せずに戻ってきた prog[v] += 1 find_flag = False for i in range(prog[v], len(E)): to, cap, rev = E[i] prog[v] = i if not cap: continue if level[to] <= lv: continue find_flag = True break if not find_flag: ascend = True stack.pop() continue ascend = False x = f if f < cap else cap stack.append((to, x)) return ff def max_flow(self): flow = 0 while True: self.bfs() if not self.level[self.sink]: return flow self.progress = [0] * self.N while True: f = self.dfs() if not f: break flow += f return flow N = int(readline()) source = N + N sink = N + N + 1 dinic = Dinic(N + N + 2, source, sink) X = 100 INF = 10 ** 9 add = dinic.add_edge for i in range(N): B, C = map(int, readline().split()) add(source, i, X - C) add(i, i + N, X) add(i + N, sink, X - B) add(i + N, i, INF) M = int(readline()) m = map(int, read().split()) for D, E in zip(m, m): add(D + N, E, INF) f = dinic.max_flow() answer = X * N - f print(answer)