December 2016
Intermediate to advanced
440 pages
9h 44m
Japanese
Content preview from アルゴリズムクイックリファレンス 第2版
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8.6
積み替え
■
273
8.6
積み替え
入力は次の通り。
●
m
個の供給基地
s
i
があって、商品を
sup(s
i
)
ユニット生成する能力がある。
●
n
個の需要基地
t
j
があって、商品を
dem(t
j
)
ユニット要求する。
●
w
個の倉庫基地があって、商品を最大で
max
k
ユニットを受け取って再出荷す
る（積み替え）。倉庫での処理は
1
ユニット当たり
wp
k
の固定コストがかかる。
供給基地
s
i
から需要基地
t
j
への出荷には、ユニット当たり
d(i, j)
の固定出荷コス
トがかかり、供給基地
s
i
から倉庫基地
w
k
への輸送には、ユニット当たり
ts(i, k)
の固
定積み替え出荷コストがかかり、倉庫基地
w
k
から需要基地
t
j
への輸送には、
ts(k, j)
の固定積み替え出荷コストがかかる。目標は、供給基地
s
i
から需要基地
t
j
へのフロー
f(i, j)
を、全体コストを最小にするように決めることだが、それは次のように記述
できる。
全体 コ スト
(TC )
＝全 輸 送コ ス ト
(TSC )
＋全 積 み替 え コ スト
(TTC )
TSC
＝∑
i
∑
j
d (i, j )* f (i, j )
TTC
＝∑
i
∑
k
ts (i, k)* f (i, k)
＋∑
j
∑
k
ts (j, k)* f (j, k)
目標は、すべての供給需要制約を満たしながら、
TC
が最小であることを保証す
る整数値
f(i, j)
≧
0
を見つけることである。最終的に、倉庫を通るユニットのネッ
トフローは
0
でなければならず、ユニットが失われたり（追加されたり）しないこと
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.