February 2023
Intermediate
256 pages
5h 50m
Japanese
Content preview from アルゴリズム図鑑 増補改訂版 絵で見てわかる33のアルゴリズム
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No.
2-7
クイックソートでは、基準となる数（ピボット：
pivot
と呼ばれる）を数列の中からランダムに
1
つ選びます。そして、ピボット以外の数を、「 ピボットより小さい数」と「ピボット以上の数」
の
2
つのグループに分けます。そしてそれらを以下のように配置します。
[
い
]
[
]
すると、あとはそれぞれの
[ ]
の中をソートしてしまえば、全体がソートできます。
[ ]
内を
ソートするのにも、再びクイックソートを使います。
5 7 63 421 98
クイックソートてい
5 7 63 421 98
pivot
基と数ット数列のランダムに
1
つ選は
4
選
01
02
5 7 63
4
21 98
pivot
ットの数字ットとていットりさい数字はにい数
字はに
5 7 6
3 4
21 98
pivot
5 7 6
3
4
21 98
pivot
3
とットの
4
3
4
の
3
はに
5
7 6
3
4
21 98
pivot
5
7 6
3
4
21 98
pivot
に
5
とットの
4
5
4
の
5
はに ...
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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.