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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66
■
4
章 整列アルゴリズム
表4-3 メモリ移動を用いた挿入ソートと単純挿入ソートの比較（秒）
n メモリ移動挿入ソート（
B
n
） 単純挿入ソート（
S
n
）
1,024 0.0039 0.0130
2,048 0.0153 0.0516
4,096 0.0612 0.2047
8,192 0.2473 0.8160
16,384 0.9913 3.2575
32,768 3.9549 13.0650
65,536 15.8722 52.2913
131,072 68.4009 209.2943
ポインタによる
挿入ソート
では、要素の入れ替えはさらに効率的になる。コンパ
イラは、コストのかかるメモリアクセスを最小化するような最適コードを生成でき
る。
4.2
選択ソート
一般的な整列戦略の
1
つに、範囲
A[ 0, n)
から最大値を選択して、右端の要素
A[n
−
1]
と交換する方法がある。このプロセスを残りのより狭い範囲
A[ 0, n
−
1)
に繰り返し、
A
を整列する。
選択ソート
（
Selection Sort
）は
3
章の貪欲戦略の例で
ある。例4-3に
C
による実装を示す。
例
4-3
選択ソートの
C
による実装
static int selectMax (void **ar, int left, int right,
int (*cmp)(const void *,const void *)) {
int maxPos = left;
int i = left;
while (++i <= right) {
if (cmp(ar[i], ...
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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.