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<meta content="アニメーションによる図解とワンクリックで実行できるコードで学ぶ、データ構造とアルゴリズムの入門書" name="description"/>
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Hello Algo
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Hello Algo
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ホーム
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<img alt="" src="assets/hero/astronaut.png" style="height: 46.673%; left: 35.413%; top: 24.343%;"/>
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アルゴリズム入門
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計算量
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配列と連結リスト
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スタックとキュー
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ハッシュテーブル
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木
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グラフ
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ソート
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分割統治
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バックトラッキング
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動的計画法
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<a href="chapter_greedy/">
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貪欲法
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<div class="heading-div">
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<p style="margin-top: max(-1vh, -2vw); margin-bottom: min(2vh, 3.5vw);">
アニメーションによる図解とワンクリックで実行できるコードで学ぶ、データ構造とアルゴリズムの入門書
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読み始める
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GitHub
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オンラインで読む
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既存の PDF/EPUB を確認
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<p>
日本語版はオンラインで公開しています。ダウンロード先には既存の各言語版が掲載されており、今回の公開に伴う新たな日本語 PDF/EPUB の配布はありません。
</p>
<p style="margin-top: 2em;">
500 点のアニメーション図解、14 種類のプログラミング言語のコード、コミュニティでの 3000 件の質問と回答が、データ構造とアルゴリズムの入門を支えます。
</p>
</div>
</section>
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<h3 style="text-align: center; margin: 1em auto;">
推薦の言葉
</h3>
<div class="intro-container endor-container">
<div class="intro-text endor-text">
<p style="margin-bottom: 0;">
「手を動かし、考えながら学べる、わかりやすいデータ構造とアルゴリズムの入門書です。アルゴリズムを初めて学ぶ方に、ぜひおすすめします。」
</p>
<p style="font-weight: bold;">
—— 邓俊辉、清華大学コンピュータ科学系教授
</p>
</div>
<div class="intro-text endor-text">
<p style="margin-bottom: 0;">
「私がデータ構造とアルゴリズムを学んでいた頃に『Hello Algo』があれば、学ぶのが 10 倍楽になっていたでしょう!」
</p>
<p style="font-weight: bold;">
—— 李沐、Amazon シニア・プリンシパル・サイエンティスト
</p>
</div>
</div>
</div>
</section>
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<div class="intro-text">
<div>
<div style="display: flex; align-items: center;">
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<h3 style="margin-left: 0.5em;">
アニメーションによる図解
</h3>
</div>
<p style="margin: 0;">
わかりやすい内容で、無理なく学べます
</p>
<p class="intro-quote">
"A picture is worth a thousand words."
<br/>
「一枚の図は千の言葉に勝る」
</p>
</div>
</div>
<video aria-label="アルゴリズムの動きを示すアニメーション" autoplay="" class="intro-image" loop="" muted="" playsinline="" src="index.assets/animation.mp4">
</video>
</div>
<div class="intro-container">
<video aria-label="コードを実行する例" autoplay="" class="intro-image" loop="" muted="" playsinline="" src="index.assets/running_code.mp4">
</video>
<div class="intro-text">
<div>
<div style="display: flex; align-items: center;">
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</svg>
<h3 style="margin-left: 0.5em;">
ワンクリックで実行
</h3>
</div>
<p style="margin: 0;">
十数種類のプログラミング言語に対応し、コードの実行を可視化できます
</p>
<p class="intro-quote">
"Talk is cheap. Show me the code."
<br/>
「口で語るより、コードを見せよう」
</p>
</div>
</div>
</div>
<div class="intro-container">
<div class="intro-text">
<div>
<div style="display: flex; align-items: center;">
<svg height="1.5em" viewbox="0 0 640 512" width="1.5em" xmlns="http://www.w3.org/2000/svg">
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<h3 style="margin-left: 0.5em;">
読者同士で学び合う
</h3>
</div>
<p style="margin: 0;">
質問や意見を交わし、読者同士で一緒に理解を深めましょう
</p>
<p class="intro-quote">
"Learning by teaching."
<br/>
「教えることも、学びにつながる」
</p>
</div>
</div>
<video aria-label="コメントで学び合う例" autoplay="" class="intro-image" loop="" muted="" playsinline="" src="index.assets/comment.mp4">
</video>
</div>
</div>
</section>
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<div style="margin: 2em auto;">
<h3>
著者
</h3>
<div class="profile-div">
<div class="profile-cell">
<a href="https://github.com/krahets">
<img alt="著者:yudongjin" class="profile-img" src="assets/avatar/avatar_yudongjin.jpg"/>
<br/>
<b>
靳宇栋(@krahets)
</b>
</a>
</div>
</div>
</div>
<div style="margin: 2em auto;">
<h3>
コードのレビュー担当者
</h3>
<p>
原書のさまざまな言語によるコードは、次の開発者の協力によって作られました。その尽力と貢献に感謝します!
</p>
<div class="profile-div">
<div class="profile-cell">
<a href="https://github.com/coderonion">
<img alt="コードのレビュー担当者:coderonion" class="profile-img" src="assets/avatar/avatar_coderonion.jpg"/>
<br/>
<b>
coderonion
</b>
<br/>
<sub>
Zig, Rust
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/curtishd">
<img alt="コードのレビュー担当者:curtishd" class="profile-img" src="assets/avatar/avatar_curtishd.jpg"/>
<br/>
<b>
curtishd
</b>
<br/>
<sub>
Kotlin
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/Gonglja">
<img alt="コードのレビュー担当者:Gonglja" class="profile-img" src="assets/avatar/avatar_Gonglja.jpg"/>
<br/>
<b>
Gonglja
</b>
<br/>
<sub>
C, C++
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/gvenusleo">
<img alt="コードのレビュー担当者:gvenusleo" class="profile-img" src="assets/avatar/avatar_gvenusleo.jpg"/>
<br/>
<b>
gvenusleo
</b>
<br/>
<sub>
Dart
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/hpstory">
<img alt="コードのレビュー担当者:hpstory" class="profile-img" src="assets/avatar/avatar_hpstory.jpg"/>
<br/>
<b>
hpstory
</b>
<br/>
<sub>
C#
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/justin-tse">
<img alt="コードのレビュー担当者:justin-tse" class="profile-img" src="assets/avatar/avatar_justin-tse.jpg"/>
<br/>
<b>
justin-tse
</b>
<br/>
<sub>
JS, TS
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/khoaxuantu">
<img alt="コードのレビュー担当者:khoaxuantu" class="profile-img" src="assets/avatar/avatar_khoaxuantu.jpg"/>
<br/>
<b>
khoaxuantu
</b>
<br/>
<sub>
Ruby
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/krahets">
<img alt="コードのレビュー担当者:krahets" class="profile-img" src="assets/avatar/avatar_krahets.jpg"/>
<br/>
<b>
krahets
</b>
<br/>
<sub>
Python, Java
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/night-cruise">
<img alt="コードのレビュー担当者:night-cruise" class="profile-img" src="assets/avatar/avatar_night-cruise.jpg"/>
<br/>
<b>
night-cruise
</b>
<br/>
<sub>
Rust
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/nuomi1">
<img alt="コードのレビュー担当者:nuomi1" class="profile-img" src="assets/avatar/avatar_nuomi1.jpg"/>
<br/>
<b>
nuomi1
</b>
<br/>
<sub>
Swift
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/Reanon">
<img alt="コードのレビュー担当者:Reanon" class="profile-img" src="assets/avatar/avatar_Reanon.jpg"/>
<br/>
<b>
Reanon
</b>
<br/>
<sub>
Go, C
</sub>
</a>
</div>
<div class="profile-cell">
<a href="https://github.com/rongyi">
<img alt="コードのレビュー担当者:rongyi" class="profile-img" src="../assets/avatar/avatar_rongyi.jpg"/>
<br/>
<b>
rongyi
</b>
<br/>
<sub>
Rust
</sub>
</a>
</div>
</div>
</div>
<div style="margin: 2em auto;">
<h3>
貢献者
</h3>
<p>
本書は、オープンソースコミュニティの 200 人以上の貢献者の協力により、改善を重ねています。時間と労力を注いでくださった皆さんに感謝します!
</p>
<a href="https://github.com/krahets/hello-algo/graphs/contributors">
<img alt="貢献者の皆さん" src="https://contrib.rocks/image?repo=krahets/hello-algo&amp;max=300&amp;columns=12" style="width: 100%; max-width: 38.5em;"/>
</a>
</div>
</div>
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Hello Algo
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序文
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序文
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第 0 章   はじめに
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第 0 章   はじめに
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0.1   本書について
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0.2   本書の使い方
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0.3   まとめ
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第 1 章   アルゴリズムとの出会い
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第 1 章   アルゴリズムとの出会い
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1.1   アルゴリズムはどこにでもある
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1.2   アルゴリズムとは
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1.3   まとめ
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第 2 章   計算量の解析
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第 2 章   計算量の解析
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2.1   アルゴリズムの効率の評価
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2.2   反復と再帰
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2.3   時間計算量
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2.4   空間計算量
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2.5   まとめ
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2.6   練習問題
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第 3 章   データ構造
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第 3 章   データ構造
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3.1   データ構造の分類
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3.2   基本データ型
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3.3   数値の符号化 *
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3.4   文字エンコーディング *
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3.5   まとめ
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3.6   練習問題
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第 4 章   配列と連結リスト
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第 4 章   配列と連結リスト
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4.1   配列
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4.2   連結リスト
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4.3   リスト
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4.4   メモリとキャッシュ *
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4.5   まとめ
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4.6   練習問題
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第 5 章   スタックとキュー
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第 5 章   スタックとキュー
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5.1   スタック
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5.2   キュー
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5.3   両端キュー
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5.4   まとめ
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5.5   練習問題
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第 6 章   ハッシュテーブル
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第 6 章   ハッシュテーブル
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6.1   ハッシュテーブル
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6.2   ハッシュ衝突
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6.3   ハッシュアルゴリズム
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6.4   まとめ
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6.5   練習問題
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第 7 章   木
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第 7 章   木
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7.1   二分木
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7.2   二分木の走査
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7.3   二分木の配列表現
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7.4   二分探索木
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7.5   AVL 木 *
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7.6   まとめ
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7.7   練習問題
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第 8 章   ヒープ
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第 8 章   ヒープ
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8.1   ヒープ
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8.2   ヒープの構築
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8.3   Top-k 問題
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8.4   まとめ
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8.5   練習問題
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第 9 章   グラフ
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第 9 章   グラフ
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9.1   グラフ
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9.2   グラフの基本操作
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9.3   グラフの走査
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9.4   まとめ
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9.5   練習問題
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第 10 章   探索
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第 10 章   探索
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10.1   二分探索
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10.2   二分探索で挿入位置を探す
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10.3   二分探索で境界を探す
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10.4   ハッシュを使った最適化
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10.5   探索アルゴリズムを改めて考える
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10.6   まとめ
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10.7   練習問題
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第 11 章   ソート
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第 11 章   ソート
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11.1   ソートアルゴリズム
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11.2   選択ソート
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11.3   バブルソート
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11.4   挿入ソート
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11.5   クイックソート
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11.6   マージソート
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11.7   ヒープソート
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11.8   バケットソート
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11.9   カウントソート
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11.10   基数ソート
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11.11   まとめ
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11.12   練習問題
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第 12 章   分割統治
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第 12 章   分割統治
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12.1   分割統治アルゴリズム
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12.2   分割統治による探索戦略
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12.3   二分木の構築問題
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12.4   ハノイの塔の問題
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12.5   まとめ
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12.6   練習問題
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第 13 章   バックトラッキング
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第 13 章   バックトラッキング
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13.1   バックトラッキングアルゴリズム
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13.2   順列列挙問題
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13.3   部分集合和問題
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13.4   n クイーン問題
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13.5   まとめ
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13.6   練習問題
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第 14 章   動的計画法
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第 14 章   動的計画法
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14.1   動的計画法への第一歩
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14.2   動的計画法の問題の特徴
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14.3   動的計画法の解き方
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14.4   0-1 ナップサック問題
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14.5   個数制限なしナップサック問題
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14.6   編集距離問題
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14.7   まとめ
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14.8   練習問題
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第 15 章   貪欲法
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第 15 章   貪欲法
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15.1   貪欲アルゴリズム
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15.2   分割可能ナップサック問題
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15.3   最大容量問題
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15.4   整数を分割して積を最大にする問題
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15.5   まとめ
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15.6   練習問題
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16.2   一緒に本書を作りましょう
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16.3   用語集
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参考文献
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