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Problem B
1.
Problem B Amidakuji あみだくじ Aizu Camp
2013 Day1 9/3 @Respect2D
2.
問題概要 あみだくじがある 横棒の位置を自由に上下させていい ◦
ただし、結果が変わらないように あみだくじの最小の高さを出力せよ
3.
誤解法 くじの結果が変わらない範囲で貪欲に横棒 を限界まで上昇させる ◦ 端点が接する横棒が出現する直前まで上昇させる 高さ1 高さ2 高さ3 高さ4 1
2 3 4 高さ1 高さ2 高さ3 高さ4 1 2 3 4 ここで他の横棒と 接するから、上に 動かせなさそう...
4.
さっきの例 本当にどの横棒も動かせない? そんなことない
上から2番目の棒より上に2本上昇させると高さ3 入力の横棒の順番のまま貪欲法を行っても最小 の高さは求まらない 高さ1 高さ2 高さ3 高さ4 1 2 3 4 高さ1 高さ2 高さ3 高さ4 1 2 3 4
5.
想定解法 横棒の現れる順番を全通り調べる ◦ 再帰 ◦
もしくは、next_permutation ◦ 横棒の数は、高々8本なので、この方法で十分 順番を決めたら、先ほどの貪欲法で高さを求める 最も最小だった高さを出力する
6.
結果 First AC ◦
logicmachine Accept / Submit ◦ 16 / 74 (21.62 %)
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