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javaによる探索アルゴリズムとリスト探索
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javaによる探索アルゴリズムとリスト探索
1.
javaによる探索アルゴリズム 〜リスト探索〜 2015/03/17/Kentsu141
2.
アジェンダ ● 探索アルゴリズム、リスト探索とは ● 線形探索 ●
二分探索
3.
探索アルゴリズム リスト探索とは
4.
探索アルゴリズム、リスト探索とは あるデータなどの対象に対して 考えられるいくつもの解を評価し結果を返すアルゴリズム のこと →探索アルゴリズム 対象のデータ等から 設定されたキーを持つものを探すアルゴリズムのこと →リスト探索
5.
線形探索アルゴリズム
6.
線形探索アルゴリズム 最も単純で簡単な探索アルゴリズムの1つで 多分多くの人が知らず知らずのうちに実装して いるであろうリスト探索アルゴリズムでもある javaに限らず例を上げるならforやwhileを 何らかの配列に対して使用する感覚に近い
7.
例)線形探索 int[] a =
{1,2,3,4,5,6}; int[] key = 2; for(int i=0;i<a.length;i++){ if(key == a[i])break; }
8.
二分探索アルゴリズム
9.
二分探索アルゴリズムとは 線形探索と同様に 基本的な探索、リスト探索アルゴリズムの1つ 仕組みはデータに対して3点を決めその点の範 囲とkeyの持つ値とを比較して絞っていく 線形探索よりも速く処理を行うことができる
10.
例)二分探索 int low =
0; int high = n-1; while(low <= high){ int center = (low+high)/2; if(key == center){ break; }else if(key > center){ low = center + 1; }else if(key < center){ high = center - 1; } }
11.
線形探索と二分探索 ● 線形探索ではデータnに対して最悪nまでデータを探索する 必要が出てくるが 二分探索は始めからkeyが無いと確定している半分を切り 捨てて考えるので速度が早く計算量も少ない ● しかし線形探索が扱うランダムなデータとは違い 二分探索ではデータをソートしなければ その効果を発揮しないどころか、はじめにkeyが含まれる 範囲すら切り捨てる可能性があるので注意すべき
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