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Yohei Ito
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Problem E
1.
Problem E English 英語の勉強 Aizu Camp
2013 Day1 9/3 @Respect2D
2.
問題概要 4*4のアルファベット大文字の盤面 盤面から英単語をたくさん見つける ◦
指で、同じマスを通らず描いたラインで単語が決まる ◦ 指は、隣接する8方向に動かせる ◦ x文字の単語を見つけるにはx秒かかる 辞書 ◦ 単語には点数がついていて1つ見つければ、得点を得る ◦ 全く同じ指のラインに対しては、最初の1回だけ加点 制限時間T秒以内で最大何点取れるか
3.
サンプル 例えば、以下の盤面で”CIEL”を見つければ ◦ タイムは4秒消費 ◦
得点は10点獲得 同じような操作をT秒間続けて最大得点を目指す A S L A C I L I I R Z N E L E U 辞書 AIZU 10点 LINER 6点 LINE 4点 ALL 2点 AS 1点 CIEL 10点 盤面 A S L A C I L I I R Z N E L E U
4.
想定解法 第1段階 ◦ 辞書の各単語が盤面にいくつ隠れているか求める ◦
盤面は4*4、単語は最大8文字なので、DFSで余裕 第2段階 ◦ 個数制限付きナップサック問題そのままになる ◦ 次のように置き換えたナップサック 重さ → 時間 荷物 → 単語 価値 → 獲得点数 ◦ 個数制限付きナップサック問題は、蟻本第2版 P.302 (上級編)に載っています
5.
結果 First AC ◦
rankalee Accept / Submit ◦ 9 / 38 (23.68 %)
6.
元ネタ スマホのゲーム 「WORD
HERO」 興味ある人はやってみてください ゲームシステムは、問題で説明した ものとほぼ同じです
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