結果

問題 No.654 Air E869120
コンテスト
ユーザー kamojiro
提出日時 2020-06-10 20:09:26
言語 Python3
(3.13.1 + numpy 2.2.1 + scipy 1.14.1)
結果
WA  
実行時間 -
コード長 2,244 bytes
コンパイル時間 95 ms
コンパイル使用メモリ 13,056 KB
実行使用メモリ 12,416 KB
最終ジャッジ日時 2024-06-23 14:50:05
合計ジャッジ時間 3,463 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 5
other AC * 27 WA * 8
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 # 

import sys
input = sys.stdin.readline
from collections import defaultdict
INF = 10**12

def dfs_for_Ford_Fulkerson(N,E,capacity,s,g,flowing):
    stack = [(s,INF)]
    root = [0]*N
    root[s] = -1
    V = [False]*N
    V[s] = True
    while stack:
        u, flow = stack.pop()
        for v in E[u]:
            if not V[v] and capacity[(u,v)] > 0:
                root[v] = u
                V[v] = True
                if v == g:
                    if capacity[(u,v)] < flow:
                        flow = capacity[(u,v)]
                    break
                stack.append((v, min(flow, capacity[(u,v)])))
        else:
            continue
        break
    else:
        return False
    now = g
    while now != s:
        before = root[now]
        capacity[(before, now)] -= flow
        capacity[(now, before)] += flow
        now = before
    flowing[0] += flow
    return True

def Ford_Fulkerson(N,E,capacity, s, g):
    flowing = [0]
    while dfs_for_Ford_Fulkerson(N,E,capacity,s,g, flowing):
        pass
    return flowing[0]

def main():
    N, M, d = map( int, input().split())
    UVPQW = [ tuple( map( int, input().split())) for _ in range(M)]
    E = [set() for _ in range(N)]
    L = 10**9
    E[0].add(0)
    E[N-1].add(L)
    for u, v, p, q, _ in UVPQW:
        u, v = u-1, v-1
        if q+d <= L:
            E[u].add(p)
            E[v].add(q+d)
    F = [sorted(list(E[i])) for i in range(N)]
    index = 0
    VtoI = defaultdict( int)
    for i in range(N):
        for v in F[i]:
            VtoI[(i,v)] = index
            index += 1
    I = index
    G = [[] for _ in range(I)]
    capacity = defaultdict( int)
    for u,v,p,q,w in UVPQW:
        u, v = u-1, v-1
        q += d
        if q > L:
            continue
        a = VtoI[(u,p)]
        b = VtoI[(v,q)]
        G[a].append(b)
        capacity[(a,b)] = +w
        G[b].append(a)
    for i in range(N):
        lg = len(F[i])
        for j in range(lg-1):
            a = VtoI[(i,F[i][j])]
            b = VtoI[(i, F[i][j+1])]
            G[a].append(b)
            capacity[(a,b)] = INF
            G[b].append(a)
    s = VtoI[(0,0)]
    g = VtoI[(N-1,L)]
    print( Ford_Fulkerson(I,G,capacity,s,g))
    
if __name__ == '__main__':
    main()
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