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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50
■
3
章 アルゴリズムの構成要素
例
3-2
配列の最大要素を見つける再帰分割統治法式
/*
再帰呼び出し
*/
public static int maxElement (int[] vals) {
if (vals.length == 0) {
throw new NoSuchElementException("No Max Element in Empty Array.");
}
return maxElement(vals, 0, vals.length);
}
/*
部分問題
vals[left, right)
の最大要素を計算する。
*/
static int maxElement (int[] vals, int left, int right) {
if (right - left == 1) {
return vals[left];
}
//
部分問題を計算する
int mid = (left + right)/2;
int max1 = maxElement(vals, left, mid);
int max2 = maxElement(vals, mid, right);
//
部分問題の結果から最終結果を計算する
if (max1 > max2) { return max1; }
return max2;
}
例3-2に示される構造の分割統治法アルゴリズムは、ここに示すように解決ステッ
プが定数
O(1)
時間で達成されるなら
O(n)
性能を示す。解決ステップそのものに
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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.