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JOI模擬本選1の解説です ソースコード読んだほうがわかりやすいかもしれません
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反転
1.
[1] 反転
2.
問題概要 • H行W列の0または1が並んでいます。 • 1<A≦B<H、1<C≦D<WとなるA、B、C、Dを選び、 A行目からB行目の0と1を反転した後、C列目からD 列目までの0と1を反転させます。 •
この時、うまくA、B、C、Dを選ぶことによって操作後 にある1の数を最小化してください。
3.
問題概要 • 誤読が多そうだったので。 •1<A≦B<H •1<C≦D<W
4.
解法(10点) • A、B、C、Dをすべて試し、いもす法を使って高速化 すればとることができます。
5.
解法(満点) • まず、AとBについてはすべて試します。 • そして、各計算を𝑂(𝑊)で行います。 •
そうすれば全体で𝑂 𝐻2 𝑊 で計算できます。 • それぞれどのように計算するのかというと、1からW までiを順番に動かしていって、i<CかC≦i≦Dか D <iかみたいな感じの状態をもってDPします。 • この時、累積和も併用します。
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