diff --git a/docs/02advanced/04recursion/index.mdx b/docs/02advanced/04recursion/index.mdx
new file mode 100644
index 000000000..e29ff7860
--- /dev/null
+++ b/docs/02advanced/04recursion/index.mdx
@@ -0,0 +1,416 @@
+---
+sidebar_position: 4
+---
+
+import ViewSource from "@site/src/components/ViewSource/ViewSource";
+import Answer from "@site/src/components/Answer";
+
+# 再帰
+
+## 簡単な再帰関数
+
+今回は、再帰関数を学んでいきます。
+
+ではまずは、次の問題を考えてみましょう。
+
+$a_1 = 1$、$a_n = a_{n - 1} + 1$ とします。このとき、$a_n$ を求めるプログラムを書いてください。
+
+様々な方法が考えられます。
+
+
解法 1
+
+この漸化式は、次のように数学的に解くことができます。
+
+$$
+\begin{align*}
+ a_n &= a_{n-1} + 1 \\
+ \therefore a_n &= a_1 + (n-1)\times 1 \\
+ \therefore a_n &= n
+\end{align*}
+$$
+
+よって、この結果を使えば次のように簡単に解けます。
+
+
+
+解法 2
+
+他には、次のようにして $a_1,a_2,a_3,\cdots$ のように順番に求めていくこともできます。
+
+
+
+解法 1 のように数学的に解くことができればもちろん最も良いですが、数学的に解けないような場合は解法 2 のようにするしかなさそうです。しかし、解法 2 は漸化式の形とは少し見た目が違うため少し考えてから作らないといけません。
+
+そのようなときに、再帰関数を使うとより簡単に書くことができます。(実は、再帰関数を使う以外の選択肢がないような場面もあります。)
+
+実際に、この問題を再帰関数を使って解いたプログラムを見てみましょう。
+
+
+
+このプログラムを見ると、漸化式の形そのままですね。何も考えずに簡単に作ることができます。
+
+さらに、このプログラムをよく見ると関数の中に関数が入っている形になっています。`a(n)` の値を求めるために `a(n - 1)` を使っています。さらに、`a(n - 1)` を求めるために `a(n - 2)` を使っています。これを繰り返していきますが、`a(1)` は `1` とわかっているので、そこで終了します。
+
+```mermaid
+flowchart LR
+ 5["a(5)"] -- 呼び出し --> 4["a(4)"]
+ 4["a(4)"] -- 呼び出し --> 3["a(3)"]
+ 3["a(3)"] -- 呼び出し --> 2["a(2)"]
+ 2["a(2)"] -- 呼び出し --> 1["a(1)"]
+```
+
+```mermaid
+flowchart RL
+ 1["a(1)"] -- 1 --> 2["a(2)"]
+ 2["a(2)"] -- 2 --> 3["a(3)"]
+ 3["a(3)"] -- 3 --> 4["a(4)"]
+ 4["a(4)"] -- 4 --> 5["a(5)"]
+```
+
+再帰関数の作り方をまとめると、次のようになります。
+
+1. 漸化式を立てて、自身を呼び出す。(例:$a_n = a_{n-1} + 1$ )
+1. 初期条件の処理を別に作っておく。(例:$a_1 = 1$ )
+
+:::info
+
+再帰の定義を普通に書けば次のようになります。
+
+> **再帰**(さいき 英:Recursion,Recursive)は、ある物事について記述する際に、記述しているもの自体への参照が、その記述中にあらわれることをいう。 フリー百科事典 Wikipedia より
+
+しかし、再帰の性質から次のように定義が書かれることもあります(笑)
+
+
+
+コンピューターの世界では、再帰を用いた命名もよくあります。再帰的接頭語と呼ばれます。例えば、PHP は「PHP: Hypertext Preprocessor」、GNU は「GNU's Not Unix」、WINE は「Wine Is Not an Emulator」、TikZ は「TikZ ist kein Zeichenprogramm」となっています。
+:::
+
+## 再帰関数を使ったフィボナッチ数列
+
+では、再帰を使ってもう少し難しいプログラムも作ってみましょう。
+
+フィボナッチ数を求めるプログラムを作ってみましょう。
+フィボナッチ数列($F_n$)は、次のように定義されます。
+
+$$
+\begin{align*}
+ &F_0 = 0 \\
+ &F_1 = 1 \\
+ &F_n = F_{n - 1} + F_{n - 2} \quad (n\geq 2)
+\end{align*}
+$$
+
+次のような数列になっています。
+
+$$
+0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, \cdots
+$$
+
+
+
+やはり、再帰を使うと定義どおりに書けて簡単ですね。
+
+`fib` 関数の流れは次のようになっています。
+
+```mermaid
+flowchart
+ A["fib(5)"] --> B["fib(4)"]
+ A --> C["fib(3)"]
+ B --> D["fib(3)"]
+ B --> E["fib(2)"]
+ C --> F["fib(2)"]
+ C --> G["fib(1)"]
+ D --> H["fib(2)"]
+ D --> I["fib(1)"]
+ E --> J["fib(1)"]
+ E --> K["fib(0)"]
+ F --> L["fib(1)"]
+ F --> M["fib(0)"]
+ H --> N["fib(1)"]
+ H --> O["fib(0)"]
+```
+
+:::info
+実は、フィボナッチ数列の一般項は求めることができます。ビネの公式と呼ばれます。
+
+$$
+F_n = F_{n - 1} + F_{n - 2}
+$$
+
+$x^2 - x - 1 = 0$ の 2 解を $\alpha, \beta$ とする。すなわち、$\displaystyle \alpha = \frac{1 + \sqrt{5}}{2}$、$\displaystyle \beta = \frac{1 - \sqrt{5}}{2}$とすれば、
+
+$$
+\begin{dcases}
+ \alpha + \beta &= 1 \\
+ \alpha \beta &= -1
+\end{dcases}
+$$
+
+であるから、
+
+$$
+F_n - (\alpha + \beta)F_{n - 1} + \alpha \beta F_{n - 2} = 0
+$$
+
+$$
+\therefore
+\begin{dcases}
+ F_n - \alpha F_{n - 1} &= \beta (F_{n - 1} - \alpha F_{n - 2}) \\
+ F_n - \beta F_{n - 1} &= \alpha (F_{n - 1} - \beta F_{n - 2})
+\end{dcases}
+$$
+
+$$
+\therefore
+\begin{dcases}
+ F_{n + 1} - \alpha F_n &= \beta^n (F_1 - \alpha F_0) \\
+ F_{n + 1} - \beta F_n &= \alpha^n (F_1 - \beta F_0)
+\end{dcases}
+$$
+
+$$
+\therefore (\alpha-\beta)F_n = (\alpha^n - \beta^n)F_1 - F_0 (\beta \alpha^n - \alpha \beta^n)
+$$
+
+$$
+\therefore F_n = \frac{\alpha^n - \beta^n}{\alpha-\beta}
+$$
+
+$$
+\therefore F_n = \frac{1}{\sqrt{5}}\left\{\left(\frac{1 + \sqrt{5}}{2}\right)^n - \left(\frac{1 - \sqrt{5}}{2}\right)^n\right\}
+$$
+
+:::
+
+### 練習問題 1
+
+再帰関数を使って、$1$ から $n$ までの和を求める関数を作ってみましょう。
+
+
+漸化式は、次のようになります。
+
+$$
+\begin{align*}
+ &a_1=1 \\
+ &a_n=a_{n - 1} + n
+\end{align*}
+$$
+
+これを基にすると、次のようになります。
+
+
+
+
+
+### 練習問題 2
+
+再帰関数を使って、最大公約数を求める関数を作ってみましょう。
+
+さらに、その結果を用いて、最小公倍数を求める関数も作ってみましょう。
+
+
+
+ユークリッドの互除法を用いれば簡単にできます。
+
+例:$30$ と $18$ の最大公約数を求める。
+
+- $30$ を $18$ で割った余りは、$12$
+- $18$ を $12$ で割った余りは、$6$
+- $12$ を $6$ で割った余りは、$0$
+
+よって、最大公約数は $6$
+
+これを使うと、最大公約数を求めるプログラムは次のようになります。
+
+
+
+また、最大公約数 $\mathrm{gcd}(a, b)$ と最小公倍数 $\mathrm{lcm}(a, b)$ の間には次のような関係があります。
+
+$$
+\mathrm{gcd}(a, b)\cdot \mathrm{lcm}(a, b) = ab
+$$
+
+これを使うと、最小公倍数を求めるプログラムは次のようになります。
+
+
+
+
+
+### 練習問題 3
+
+リュカ数を求めるプログラムを作ってみましょう。
+
+リュカ数列( $L_n$ )は次のように定義されます。
+
+$$
+\begin{align*}
+ &L_0 = 2 \\
+ &L_1 = 1 \\
+ &L_n = L_{n - 1} + L_{n - 2} \quad (n\geq 2)
+\end{align*}
+$$
+
+リュカ数列は次のようになります。
+
+$$
+2, 1, 3, 4, 7, 11, 18, 29, 47, 76, 123, 199, 322, 521, 843, 1364, 2207, \cdots
+$$
+
+
+
+フィボナッチ数列のプログラムから、`n == 0` の時と `n == 1` の時の値を変えるだけで簡単に作れます。
+
+
+
+:::info
+リュカ数列の一般項は、フィボナッチ数列の時のように計算すると、次のようになります。
+
+$$
+\begin{align*}
+ (\alpha-\beta)L_n &= (\alpha^n - \beta^n)L_1 - L_0 (\beta \alpha^n - \alpha \beta^n) \\
+ \therefore (\alpha-\beta)L_n &= (1 - 2\beta)\alpha^n - (2\alpha - 1)\beta^n \\
+ \therefore L_n &= \sqrt{5} \cdot \frac{\alpha^n + \beta^n}{\alpha-\beta}
+\end{align*}
+$$
+
+$$
+L_n = \left(\frac{1 + \sqrt{5}}{2}\right)^n + \left(\frac{1 - \sqrt{5}}{2}\right)^n
+$$
+
+:::
+
+
+
+### 練習問題 4
+
+トリボナッチ数を求めるプログラムを作ってみましょう。
+トリボナッチ数列( $T_n$ )は次のように定義されます。
+
+$$
+\begin{align*}
+ &T_0 = 0 \\
+ &T_1 = 0 \\
+ &T_2 = 1 \\
+ &T_n = T_{n - 1} + T_{n - 2} + T_{n - 3} \quad (n\geq 3)
+\end{align*}
+$$
+
+トリボナッチ数列は次のようになります。
+
+$$
+0, 0, 1, 1, 2, 4, 7, 13, 24, 44, 81, 149, 274, 504, \cdots
+$$
+
+:::info
+ちなみに、テトラナッチ数、ペンタナッチ数、…もあります。
+
+| $k$ | 名称 |
+| --- | ---------------- |
+| 2 | フィボナッチ数 |
+| 3 | トリボナッチ数 |
+| 4 | テトラナッチ数 |
+| 5 | ペンタナッチ数 |
+| 6 | ヘキサナッチ数 |
+| 7 | ヘプタナッチ数 |
+| 8 | オクタナッチ数 |
+| 9 | ノナナッチ数 |
+| 10 | デカナッチ数 |
+| 11 | ウンデカナッチ数 |
+| 12 | ドデカナッチ数 |
+
+:::
+
+:::info
+トリボナッチ数列の一般項は、次のようにして計算できます。
+
+$x^3 - x^2 - x - 1 = 0$ の 3 解を $\alpha, \beta, \gamma$ とすると、
+
+$$
+\begin{dcases}
+ \alpha + \beta + \gamma = 1 \\
+ \alpha \beta + \beta \gamma + \gamma \alpha = -1 \\
+ \alpha \beta \gamma = 1
+\end{dcases}
+$$
+
+$$
+T_n = T_{n - 1} + T_{n - 2} + T_{n - 3}
+$$
+
+$$
+\therefore T_n - (\alpha + \beta + \gamma)T_{n - 1} + (\alpha \beta + \beta \gamma + \gamma \alpha)T_{n - 2} - \alpha \beta \gamma T_{n - 3} = 0
+$$
+
+$$
+\begin{dcases}
+ \therefore T_n - \alpha T_{n - 1} = \beta (T_{n - 1} - \alpha T_{n - 2}) + \gamma (T_{n - 1} - \alpha T_{n - 2}) - \beta \gamma(T_{n - 2} - \alpha T_{n - 3}) \\
+ \therefore T_n - \beta T_{n - 1} = \gamma (T_{n - 1} - \beta T_{n - 2}) + \alpha (T_{n - 1} - \beta T_{n - 2}) - \gamma \alpha(T_{n - 2} - \beta T_{n - 3})
+\end{dcases}
+$$
+
+$U_n = T_{n + 1} - \alpha T_n, V_n = T_{n + 1} - \beta T_n$ とする。
+
+$$
+\begin{dcases}
+ U_n = \beta U_{n - 1} + \gamma U_{n - 1} - \beta \gamma U_{n - 2} \\
+ V_n = \gamma V_{n - 1} + \alpha V_{n - 1} - \gamma \alpha V_{n - 2}
+\end{dcases}
+$$
+
+$$
+\therefore
+\begin{dcases}
+ U_n - \beta U_{n - 1} = \gamma (U_{n - 1} - \beta U_{n - 2}) \\
+ U_n - \gamma U_{n - 1} = \beta (U_{n - 1} - \gamma U_{n - 2})
+\end{dcases}
+\begin{dcases}
+ V_n - \gamma V_{n - 1} = \alpha (V_{n - 1} - \gamma V_{n - 2}) \\
+ V_n - \alpha V_{n - 1} = \gamma (V_{n - 1} - \alpha V_{n - 2})
+\end{dcases}
+$$
+
+$U_0 = 0, U_1 = 1, V_0 = 0, V_1 = 1$ から、
+
+$$
+\therefore
+\begin{dcases}
+ U_n = \frac{\beta^n - \gamma^n}{\beta - \gamma} \\
+ V_n = \frac{\gamma^n - \alpha^n}{\gamma - \alpha}
+\end{dcases}
+$$
+
+$$
+\therefore
+\begin{dcases}
+ T_{n + 1} - \alpha T_n = \frac{\beta^n - \gamma^n}{\beta - \gamma} \\
+ T_{n + 1} - \beta T_n = \frac{\gamma^n - \alpha^n}{\gamma - \alpha}
+\end{dcases}
+$$
+
+$$
+\therefore T_n = \frac{\gamma^n - \alpha^n}{(\alpha - \beta)(\gamma - \alpha)} - \frac{\beta^n - \gamma^n}{(\alpha - \beta)(\beta - \gamma)}
+$$
+
+$$
+\therefore T_n = \frac{\alpha^n}{(\alpha - \beta)(\alpha - \gamma)} + \frac{\beta^n}{(\beta - \gamma)(\beta - \alpha)} + \frac{\gamma^n}{(\gamma - \alpha)(\gamma - \beta)}
+$$
+
+テトラナッチ数は、次のようになるようです。確かめてはいません。
+
+$x^4 - x^3 - x^2 - x - 1 = 0$ の 4 解を $\alpha, \beta, \gamma, \delta$ とすると、
+
+$$
+\begin{split}
+T_n = \frac{\alpha^n}{(\alpha - \beta)(\alpha - \gamma)(\alpha - \delta)} + \frac{\beta^n}{(\beta - \gamma)(\beta - \delta)(\beta - \alpha)} \\
+ + \frac{\gamma^n}{(\gamma - \delta)(\gamma - \alpha)(\gamma - \beta)} + \frac{\delta^n}{(\delta - \alpha)(\delta - \beta)(\delta - \gamma)}
+\end{split}
+$$
+
+:::
+
+
+
+
diff --git a/docs/index.mdx b/docs/index.mdx
index b10eeb905..32f23cd3d 100644
--- a/docs/index.mdx
+++ b/docs/index.mdx
@@ -24,6 +24,8 @@ Python やアルゴリズムについて簡単にまとめていこうかなと
## 更新履歴
+12/11 第八週の分を執筆 再帰
+
12/4 第七週の分を増訂 物体の運動のシミュレーション
11/28 第七週の分を執筆 物体の運動のシミュレーション
diff --git a/docusaurus.config.js b/docusaurus.config.js
index 5e6a22415..5224fac4d 100644
--- a/docusaurus.config.js
+++ b/docusaurus.config.js
@@ -31,6 +31,10 @@ const config = {
locales: ["ja"],
},
+ markdown: {
+ mermaid: true,
+ },
+
presets: [
[
"classic",
@@ -144,7 +148,7 @@ const config = {
darkTheme: darkCodeTheme,
},
}),
- themes: ["@docusaurus/theme-live-codeblock"],
+ themes: ["@docusaurus/theme-live-codeblock", "@docusaurus/theme-mermaid"],
};
module.exports = config;
diff --git a/package-lock.json b/package-lock.json
index c2580f286..2d6432f26 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,6 +11,7 @@
"@docusaurus/core": "^2.2.0",
"@docusaurus/preset-classic": "^2.2.0",
"@docusaurus/theme-live-codeblock": "^2.2.0",
+ "@docusaurus/theme-mermaid": "^2.2.0",
"@emotion/react": "^11.10.5",
"@emotion/styled": "^11.10.5",
"@mdx-js/react": "^1.6.22",
@@ -1974,6 +1975,11 @@
"node": ">=6.9.0"
}
},
+ "node_modules/@braintree/sanitize-url": {
+ "version": "6.0.2",
+ "resolved": "https://registry.npmjs.org/@braintree/sanitize-url/-/sanitize-url-6.0.2.tgz",
+ "integrity": "sha512-Tbsj02wXCbqGmzdnXNk0SOF19ChhRU70BsroIi4Pm6Ehp56in6vch94mfbdQ17DozxkL3BAVjbZ4Qc1a0HFRAg=="
+ },
"node_modules/@colors/colors": {
"version": "1.5.0",
"resolved": "https://registry.npmjs.org/@colors/colors/-/colors-1.5.0.tgz",
@@ -2468,6 +2474,28 @@
"react-dom": "^16.8.4 || ^17.0.0"
}
},
+ "node_modules/@docusaurus/theme-mermaid": {
+ "version": "2.2.0",
+ "resolved": "https://registry.npmjs.org/@docusaurus/theme-mermaid/-/theme-mermaid-2.2.0.tgz",
+ "integrity": "sha512-rEhVvWyZ9j9eABTvJ8nhfB5NbyiThva3U9J7iu4RxKYymjImEh9MiqbEdOrZusq6AQevbkoHB7n+9VsfmS55kg==",
+ "dependencies": {
+ "@docusaurus/core": "2.2.0",
+ "@docusaurus/module-type-aliases": "2.2.0",
+ "@docusaurus/theme-common": "2.2.0",
+ "@docusaurus/types": "2.2.0",
+ "@docusaurus/utils-validation": "2.2.0",
+ "@mdx-js/react": "^1.6.22",
+ "mermaid": "^9.1.1",
+ "tslib": "^2.4.0"
+ },
+ "engines": {
+ "node": ">=16.14"
+ },
+ "peerDependencies": {
+ "react": "^16.8.4 || ^17.0.0",
+ "react-dom": "^16.8.4 || ^17.0.0"
+ }
+ },
"node_modules/@docusaurus/theme-search-algolia": {
"version": "2.2.0",
"resolved": "https://registry.npmjs.org/@docusaurus/theme-search-algolia/-/theme-search-algolia-2.2.0.tgz",
@@ -6360,6 +6388,695 @@
"resolved": "https://registry.npmjs.org/csstype/-/csstype-3.1.1.tgz",
"integrity": "sha512-DJR/VvkAvSZW9bTouZue2sSxDwdTN92uHjqeKVm+0dAqdfNykRzQ95tay8aXMBAAPpUiq4Qcug2L7neoRh2Egw=="
},
+ "node_modules/d3": {
+ "version": "7.7.0",
+ "resolved": "https://registry.npmjs.org/d3/-/d3-7.7.0.tgz",
+ "integrity": "sha512-VEwHCMgMjD2WBsxeRGUE18RmzxT9Bn7ghDpzvTEvkLSBAKgTMydJjouZTjspgQfRHpPt/PB3EHWBa6SSyFQq4g==",
+ "dependencies": {
+ "d3-array": "3",
+ "d3-axis": "3",
+ "d3-brush": "3",
+ "d3-chord": "3",
+ "d3-color": "3",
+ "d3-contour": "4",
+ "d3-delaunay": "6",
+ "d3-dispatch": "3",
+ "d3-drag": "3",
+ "d3-dsv": "3",
+ "d3-ease": "3",
+ "d3-fetch": "3",
+ "d3-force": "3",
+ "d3-format": "3",
+ "d3-geo": "3",
+ "d3-hierarchy": "3",
+ "d3-interpolate": "3",
+ "d3-path": "3",
+ "d3-polygon": "3",
+ "d3-quadtree": "3",
+ "d3-random": "3",
+ "d3-scale": "4",
+ "d3-scale-chromatic": "3",
+ "d3-selection": "3",
+ "d3-shape": "3",
+ "d3-time": "3",
+ "d3-time-format": "4",
+ "d3-timer": "3",
+ "d3-transition": "3",
+ "d3-zoom": "3"
+ },
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/d3-array": {
+ "version": "3.2.1",
+ "resolved": "https://registry.npmjs.org/d3-array/-/d3-array-3.2.1.tgz",
+ "integrity": "sha512-gUY/qeHq/yNqqoCKNq4vtpFLdoCdvyNpWoC/KNjhGbhDuQpAM9sIQQKkXSNpXa9h5KySs/gzm7R88WkUutgwWQ==",
+ "dependencies": {
+ "internmap": "1 - 2"
+ },
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/d3-axis": {
+ "version": "3.0.0",
+ "resolved": "https://registry.npmjs.org/d3-axis/-/d3-axis-3.0.0.tgz",
+ "integrity": "sha512-IH5tgjV4jE/GhHkRV0HiVYPDtvfjHQlQfJHs0usq7M30XcSBvOotpmH1IgkcXsO/5gEQZD43B//fc7SRT5S+xw==",
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/d3-brush": {
+ "version": "3.0.0",
+ "resolved": "https://registry.npmjs.org/d3-brush/-/d3-brush-3.0.0.tgz",
+ "integrity": "sha512-ALnjWlVYkXsVIGlOsuWH1+3udkYFI48Ljihfnh8FZPF2QS9o+PzGLBslO0PjzVoHLZ2KCVgAM8NVkXPJB2aNnQ==",
+ "dependencies": {
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+ }
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+ }
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+ },
+ "d3-polygon": {
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+ },
+ "d3-quadtree": {
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+ },
+ "d3-scale": {
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+ "resolved": "https://registry.npmjs.org/d3-scale/-/d3-scale-2.2.2.tgz",
+ "integrity": "sha512-LbeEvGgIb8UMcAa0EATLNX0lelKWGYDQiPdHj+gLblGVhGLyNbaCn3EvrJf0A3Y/uOOU5aD6MTh5ZFCdEwGiCw==",
+ "requires": {
+ "d3-array": "^1.2.0",
+ "d3-collection": "1",
+ "d3-format": "1",
+ "d3-interpolate": "1",
+ "d3-time": "1",
+ "d3-time-format": "2"
+ }
+ },
+ "d3-scale-chromatic": {
+ "version": "1.5.0",
+ "resolved": "https://registry.npmjs.org/d3-scale-chromatic/-/d3-scale-chromatic-1.5.0.tgz",
+ "integrity": "sha512-ACcL46DYImpRFMBcpk9HhtIyC7bTBR4fNOPxwVSl0LfulDAwyiHyPOTqcDG1+t5d4P9W7t/2NAuWu59aKko/cg==",
+ "requires": {
+ "d3-color": "1",
+ "d3-interpolate": "1"
+ }
+ },
+ "d3-selection": {
+ "version": "1.4.2",
+ "resolved": "https://registry.npmjs.org/d3-selection/-/d3-selection-1.4.2.tgz",
+ "integrity": "sha512-SJ0BqYihzOjDnnlfyeHT0e30k0K1+5sR3d5fNueCNeuhZTnGw4M4o8mqJchSwgKMXCNFo+e2VTChiSJ0vYtXkg=="
+ },
+ "d3-shape": {
+ "version": "1.3.7",
+ "resolved": "https://registry.npmjs.org/d3-shape/-/d3-shape-1.3.7.tgz",
+ "integrity": "sha512-EUkvKjqPFUAZyOlhY5gzCxCeI0Aep04LwIRpsZ/mLFelJiUfnK56jo5JMDSE7yyP2kLSb6LtF+S5chMk7uqPqw==",
+ "requires": {
+ "d3-path": "1"
+ }
+ },
+ "d3-time": {
+ "version": "1.1.0",
+ "resolved": "https://registry.npmjs.org/d3-time/-/d3-time-1.1.0.tgz",
+ "integrity": "sha512-Xh0isrZ5rPYYdqhAVk8VLnMEidhz5aP7htAADH6MfzgmmicPkTo8LhkLxci61/lCB7n7UmE3bN0leRt+qvkLxA=="
+ },
+ "d3-time-format": {
+ "version": "2.3.0",
+ "resolved": "https://registry.npmjs.org/d3-time-format/-/d3-time-format-2.3.0.tgz",
+ "integrity": "sha512-guv6b2H37s2Uq/GefleCDtbe0XZAuy7Wa49VGkPVPMfLL9qObgBST3lEHJBMUp8S7NdLQAGIvr2KXk8Hc98iKQ==",
+ "requires": {
+ "d3-time": "1"
+ }
+ },
+ "d3-timer": {
+ "version": "1.0.10",
+ "resolved": "https://registry.npmjs.org/d3-timer/-/d3-timer-1.0.10.tgz",
+ "integrity": "sha512-B1JDm0XDaQC+uvo4DT79H0XmBskgS3l6Ve+1SBCfxgmtIb1AVrPIoqd+nPSv+loMX8szQ0sVUhGngL7D5QPiXw=="
+ },
+ "d3-transition": {
+ "version": "1.3.2",
+ "resolved": "https://registry.npmjs.org/d3-transition/-/d3-transition-1.3.2.tgz",
+ "integrity": "sha512-sc0gRU4PFqZ47lPVHloMn9tlPcv8jxgOQg+0zjhfZXMQuvppjG6YuwdMBE0TuqCZjeJkLecku/l9R0JPcRhaDA==",
+ "requires": {
+ "d3-color": "1",
+ "d3-dispatch": "1",
+ "d3-ease": "1",
+ "d3-interpolate": "1",
+ "d3-selection": "^1.1.0",
+ "d3-timer": "1"
+ }
+ },
+ "d3-zoom": {
+ "version": "1.8.3",
+ "resolved": "https://registry.npmjs.org/d3-zoom/-/d3-zoom-1.8.3.tgz",
+ "integrity": "sha512-VoLXTK4wvy1a0JpH2Il+F2CiOhVu7VRXWF5M/LroMIh3/zBAC3WAt7QoIvPibOavVo20hN6/37vwAsdBejLyKQ==",
+ "requires": {
+ "d3-dispatch": "1",
+ "d3-drag": "1",
+ "d3-interpolate": "1",
+ "d3-selection": "1",
+ "d3-transition": "1"
+ }
+ }
+ }
+ },
"debug": {
"version": "4.3.4",
"resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
@@ -19582,6 +20975,14 @@
"slash": "^3.0.0"
}
},
+ "delaunator": {
+ "version": "5.0.0",
+ "resolved": "https://registry.npmjs.org/delaunator/-/delaunator-5.0.0.tgz",
+ "integrity": "sha512-AyLvtyJdbv/U1GkiS6gUUzclRoAY4Gs75qkMygJJhU75LW4DNuSF2RMzpxs9jw9Oz1BobHjTdkG3zdP55VxAqw==",
+ "requires": {
+ "robust-predicates": "^3.0.0"
+ }
+ },
"depd": {
"version": "2.0.0",
"resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
@@ -19717,6 +21118,11 @@
"domelementtype": "^2.3.0"
}
},
+ "dompurify": {
+ "version": "2.4.0",
+ "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-2.4.0.tgz",
+ "integrity": "sha512-Be9tbQMZds4a3C6xTmz68NlMfeONA//4dOavl/1rNw50E+/QO0KVpbcU0PcaW0nsQxurXls9ZocqFxk8R2mWEA=="
+ },
"domutils": {
"version": "3.0.1",
"resolved": "https://registry.npmjs.org/domutils/-/domutils-3.0.1.tgz",
@@ -20329,6 +21735,11 @@
"is-extendable": "^0.1.0"
}
},
+ "fast-clone": {
+ "version": "1.5.13",
+ "resolved": "https://registry.npmjs.org/fast-clone/-/fast-clone-1.5.13.tgz",
+ "integrity": "sha512-0ez7coyFBQFjZtId+RJqJ+EQs61w9xARfqjqK0AD9vIUkSxWD4HvPt80+5evebZ1tTnv1GYKrPTipx7kOW5ipA=="
+ },
"fast-deep-equal": {
"version": "3.1.3",
"resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
@@ -20825,6 +22236,14 @@
"integrity": "sha512-bzh50DW9kTPM00T8y4o8vQg89Di9oLJVLW/KaOGIXJWP/iqCN6WKYkbNOF04vFLJhwcpYUh9ydh/+5vpOqV4YQ==",
"devOptional": true
},
+ "graphlib": {
+ "version": "2.1.8",
+ "resolved": "https://registry.npmjs.org/graphlib/-/graphlib-2.1.8.tgz",
+ "integrity": "sha512-jcLLfkpoVGmH7/InMC/1hIvOPSUh38oJtGhvrOFGzioE1DZ+0YW16RgmOJhHiuWTvGiJQ9Z1Ik43JvkRPRvE+A==",
+ "requires": {
+ "lodash": "^4.17.15"
+ }
+ },
"gray-matter": {
"version": "4.0.3",
"resolved": "https://registry.npmjs.org/gray-matter/-/gray-matter-4.0.3.tgz",
@@ -21291,6 +22710,11 @@
"side-channel": "^1.0.4"
}
},
+ "internmap": {
+ "version": "2.0.3",
+ "resolved": "https://registry.npmjs.org/internmap/-/internmap-2.0.3.tgz",
+ "integrity": "sha512-5Hh7Y1wQbvY5ooGgPbDaL5iYLAPzMTUrjMulskHLH6wnv/A+1q5rgEaiuqEjB+oxGXIVZs1FF+R/KPN3ZSQYYg=="
+ },
"interpret": {
"version": "1.4.0",
"resolved": "https://registry.npmjs.org/interpret/-/interpret-1.4.0.tgz",
@@ -21740,6 +23164,11 @@
"json-buffer": "3.0.0"
}
},
+ "khroma": {
+ "version": "2.0.0",
+ "resolved": "https://registry.npmjs.org/khroma/-/khroma-2.0.0.tgz",
+ "integrity": "sha512-2J8rDNlQWbtiNYThZRvmMv5yt44ZakX+Tz5ZIp/mN1pt4snn+m030Va5Z4v8xA0cQFDXBwO/8i42xL4QPsVk3g=="
+ },
"kind-of": {
"version": "6.0.3",
"resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.3.tgz",
@@ -22028,6 +23457,33 @@
"resolved": "https://registry.npmjs.org/merge2/-/merge2-1.4.1.tgz",
"integrity": "sha512-8q7VEgMJW4J8tcfVPy8g09NcQwZdbwFEqhe/WZkoIzjn/3TGDwtOCYtXGxA3O8tPzpczCCDgv+P2P5y00ZJOOg=="
},
+ "mermaid": {
+ "version": "9.2.2",
+ "resolved": "https://registry.npmjs.org/mermaid/-/mermaid-9.2.2.tgz",
+ "integrity": "sha512-6s7eKMqFJGS+0MYjmx8f6ZigqKBJVoSx5ql2gw6a4Aa+WJ49QiEJg7gPwywaBg3DZMs79UP7trESp4+jmaQccw==",
+ "requires": {
+ "@braintree/sanitize-url": "^6.0.0",
+ "d3": "^7.0.0",
+ "dagre": "^0.8.5",
+ "dagre-d3": "^0.6.4",
+ "dompurify": "2.4.0",
+ "fast-clone": "^1.5.13",
+ "graphlib": "^2.1.8",
+ "khroma": "^2.0.0",
+ "lodash": "^4.17.21",
+ "moment-mini": "^2.24.0",
+ "non-layered-tidy-tree-layout": "^2.0.2",
+ "stylis": "^4.1.2",
+ "uuid": "^9.0.0"
+ },
+ "dependencies": {
+ "uuid": {
+ "version": "9.0.0",
+ "resolved": "https://registry.npmjs.org/uuid/-/uuid-9.0.0.tgz",
+ "integrity": "sha512-MXcSTerfPa4uqyzStbRoTgt5XIe3x5+42+q1sDuy3R5MDk66URdLMOZe5aPX/SQd+kuYAh0FdP/pO28IkQyTeg=="
+ }
+ }
+ },
"methods": {
"version": "1.1.2",
"resolved": "https://registry.npmjs.org/methods/-/methods-1.1.2.tgz",
@@ -22133,6 +23589,11 @@
"resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.6.tgz",
"integrity": "sha512-Jsjnk4bw3YJqYzbdyBiNsPWHPfO++UGG749Cxs6peCu5Xg4nrena6OVxOYxrQTqww0Jmwt+Ref8rggumkTLz9Q=="
},
+ "moment-mini": {
+ "version": "2.29.4",
+ "resolved": "https://registry.npmjs.org/moment-mini/-/moment-mini-2.29.4.tgz",
+ "integrity": "sha512-uhXpYwHFeiTbY9KSgPPRoo1nt8OxNVdMVoTBYHfSEKeRkIkwGpO+gERmhuhBtzfaeOyTkykSrm2+noJBgqt3Hg=="
+ },
"monaco-editor": {
"version": "0.34.1",
"resolved": "https://registry.npmjs.org/monaco-editor/-/monaco-editor-0.34.1.tgz",
@@ -22220,6 +23681,11 @@
"resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.6.tgz",
"integrity": "sha512-PiVXnNuFm5+iYkLBNeq5211hvO38y63T0i2KKh2KnUs3RpzJ+JtODFjkD8yjLwnDkTYF1eKXheUwdssR+NRZdg=="
},
+ "non-layered-tidy-tree-layout": {
+ "version": "2.0.2",
+ "resolved": "https://registry.npmjs.org/non-layered-tidy-tree-layout/-/non-layered-tidy-tree-layout-2.0.2.tgz",
+ "integrity": "sha512-gkXMxRzUH+PB0ax9dUN0yYF0S25BqeAYqhgMaLUFmpXLEk7Fcu8f4emJuOAY0V8kjDICxROIKsTAKsV/v355xw=="
+ },
"normalize-path": {
"version": "3.0.0",
"resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-3.0.0.tgz",
@@ -23885,6 +25351,11 @@
"glob": "^7.1.3"
}
},
+ "robust-predicates": {
+ "version": "3.0.1",
+ "resolved": "https://registry.npmjs.org/robust-predicates/-/robust-predicates-3.0.1.tgz",
+ "integrity": "sha512-ndEIpszUHiG4HtDsQLeIuMvRsDnn8c8rYStabochtUeCvfuvNptb5TUbVD68LRAILPX7p9nqQGh4xJgn3EHS/g=="
+ },
"rtl-detect": {
"version": "1.0.4",
"resolved": "https://registry.npmjs.org/rtl-detect/-/rtl-detect-1.0.4.tgz",
@@ -23944,6 +25415,11 @@
"queue-microtask": "^1.2.2"
}
},
+ "rw": {
+ "version": "1.3.3",
+ "resolved": "https://registry.npmjs.org/rw/-/rw-1.3.3.tgz",
+ "integrity": "sha512-PdhdWy89SiZogBLaw42zdeqtRJ//zFd2PgQavcICDUgJT5oW10QCRKbJ6bg4r0/UY2M6BWd5tkxuGFRvCkgfHQ=="
+ },
"rxjs": {
"version": "7.5.7",
"resolved": "https://registry.npmjs.org/rxjs/-/rxjs-7.5.7.tgz",
diff --git a/package.json b/package.json
index 59b0ab146..95e6836e5 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
"@docusaurus/core": "^2.2.0",
"@docusaurus/preset-classic": "^2.2.0",
"@docusaurus/theme-live-codeblock": "^2.2.0",
+ "@docusaurus/theme-mermaid": "^2.2.0",
"@emotion/react": "^11.10.5",
"@emotion/styled": "^11.10.5",
"@mdx-js/react": "^1.6.22",
diff --git a/static/recursion/fib.ipynb b/static/recursion/fib.ipynb
new file mode 100644
index 000000000..aeb4f996b
--- /dev/null
+++ b/static/recursion/fib.ipynb
@@ -0,0 +1,33 @@
+{
+ "nbformat": 4,
+ "nbformat_minor": 2,
+ "metadata": {},
+ "cells": [
+ {
+ "metadata": {},
+ "source": [
+ "def fib(n):\n",
+ " if n == 0:\n",
+ " return 0\n",
+ " elif n == 1:\n",
+ " return 1\n",
+ " else:\n",
+ " return fib(n - 1) + fib(n - 2)\n",
+ "\n",
+ "\n",
+ "print(fib(10))"
+ ],
+ "cell_type": "code",
+ "outputs": [
+ {
+ "output_type": "stream",
+ "name": "stdout",
+ "text": [
+ "55\n"
+ ]
+ }
+ ],
+ "execution_count": null
+ }
+ ]
+}
diff --git a/static/recursion/gcd.ipynb b/static/recursion/gcd.ipynb
new file mode 100644
index 000000000..f82d3c6ab
--- /dev/null
+++ b/static/recursion/gcd.ipynb
@@ -0,0 +1,33 @@
+{
+ "nbformat": 4,
+ "nbformat_minor": 2,
+ "metadata": {},
+ "cells": [
+ {
+ "metadata": {},
+ "source": [
+ "def gcd(a, b):\n",
+ " if a < b:\n",
+ " a, b = b, a\n",
+ " if b == 0:\n",
+ " return a\n",
+ " else:\n",
+ " return gcd(b, a % b)\n",
+ "\n",
+ "\n",
+ "print(gcd(30, 18))"
+ ],
+ "cell_type": "code",
+ "outputs": [
+ {
+ "output_type": "stream",
+ "name": "stdout",
+ "text": [
+ "6\n"
+ ]
+ }
+ ],
+ "execution_count": null
+ }
+ ]
+}
diff --git a/static/recursion/lcm.ipynb b/static/recursion/lcm.ipynb
new file mode 100644
index 000000000..294be73ec
--- /dev/null
+++ b/static/recursion/lcm.ipynb
@@ -0,0 +1,37 @@
+{
+ "nbformat": 4,
+ "nbformat_minor": 2,
+ "metadata": {},
+ "cells": [
+ {
+ "metadata": {},
+ "source": [
+ "def gcd(m, n):\n",
+ " if m < n:\n",
+ " m, n = n, m\n",
+ " if n == 0:\n",
+ " return m\n",
+ " else:\n",
+ " return gcd(n, m % n)\n",
+ "\n",
+ "\n",
+ "def lcm(m, n):\n",
+ " return m * n / gcd(m, n)\n",
+ "\n",
+ "\n",
+ "print(lcm(30, 18))"
+ ],
+ "cell_type": "code",
+ "outputs": [
+ {
+ "output_type": "stream",
+ "name": "stdout",
+ "text": [
+ "90.0\n"
+ ]
+ }
+ ],
+ "execution_count": null
+ }
+ ]
+}
diff --git a/static/recursion/lucas.ipynb b/static/recursion/lucas.ipynb
new file mode 100644
index 000000000..edcb8ef56
--- /dev/null
+++ b/static/recursion/lucas.ipynb
@@ -0,0 +1,33 @@
+{
+ "nbformat": 4,
+ "nbformat_minor": 2,
+ "metadata": {},
+ "cells": [
+ {
+ "metadata": {},
+ "source": [
+ "def lucas(n):\n",
+ " if n == 0:\n",
+ " return 2\n",
+ " elif n == 1:\n",
+ " return 1\n",
+ " else:\n",
+ " return lucas(n - 1) + lucas(n - 2)\n",
+ "\n",
+ "\n",
+ "print(lucas(10))"
+ ],
+ "cell_type": "code",
+ "outputs": [
+ {
+ "output_type": "stream",
+ "name": "stdout",
+ "text": [
+ "123\n"
+ ]
+ }
+ ],
+ "execution_count": null
+ }
+ ]
+}
diff --git a/static/recursion/recurrence_relation_analytical.ipynb b/static/recursion/recurrence_relation_analytical.ipynb
new file mode 100644
index 000000000..e4a785a4b
--- /dev/null
+++ b/static/recursion/recurrence_relation_analytical.ipynb
@@ -0,0 +1,28 @@
+{
+ "nbformat": 4,
+ "nbformat_minor": 2,
+ "metadata": {},
+ "cells": [
+ {
+ "metadata": {},
+ "source": [
+ "def a(n):\n",
+ " return n\n",
+ "\n",
+ "\n",
+ "print(a(10))"
+ ],
+ "cell_type": "code",
+ "outputs": [
+ {
+ "output_type": "stream",
+ "name": "stdout",
+ "text": [
+ "10\n"
+ ]
+ }
+ ],
+ "execution_count": null
+ }
+ ]
+}
diff --git a/static/recursion/recurrence_relation_dp.ipynb b/static/recursion/recurrence_relation_dp.ipynb
new file mode 100644
index 000000000..0d961202a
--- /dev/null
+++ b/static/recursion/recurrence_relation_dp.ipynb
@@ -0,0 +1,31 @@
+{
+ "nbformat": 4,
+ "nbformat_minor": 2,
+ "metadata": {},
+ "cells": [
+ {
+ "metadata": {},
+ "source": [
+ "def a(n):\n",
+ " s = 1\n",
+ " for i in range(n - 1):\n",
+ " s += 1\n",
+ " return s\n",
+ "\n",
+ "\n",
+ "print(a(10))"
+ ],
+ "cell_type": "code",
+ "outputs": [
+ {
+ "output_type": "stream",
+ "name": "stdout",
+ "text": [
+ "10\n"
+ ]
+ }
+ ],
+ "execution_count": null
+ }
+ ]
+}
diff --git a/static/recursion/recurrence_relation_rec.ipynb b/static/recursion/recurrence_relation_rec.ipynb
new file mode 100644
index 000000000..931921045
--- /dev/null
+++ b/static/recursion/recurrence_relation_rec.ipynb
@@ -0,0 +1,31 @@
+{
+ "nbformat": 4,
+ "nbformat_minor": 2,
+ "metadata": {},
+ "cells": [
+ {
+ "metadata": {},
+ "source": [
+ "def a(n):\n",
+ " if n == 1:\n",
+ " return 1\n",
+ " else:\n",
+ " return a(n - 1) + 1\n",
+ "\n",
+ "\n",
+ "print(a(10))"
+ ],
+ "cell_type": "code",
+ "outputs": [
+ {
+ "output_type": "stream",
+ "name": "stdout",
+ "text": [
+ "10\n"
+ ]
+ }
+ ],
+ "execution_count": null
+ }
+ ]
+}
diff --git a/static/recursion/sum.ipynb b/static/recursion/sum.ipynb
new file mode 100644
index 000000000..4d08a87cf
--- /dev/null
+++ b/static/recursion/sum.ipynb
@@ -0,0 +1,31 @@
+{
+ "nbformat": 4,
+ "nbformat_minor": 2,
+ "metadata": {},
+ "cells": [
+ {
+ "metadata": {},
+ "source": [
+ "def sum_val(n):\n",
+ " if n == 1:\n",
+ " return 1\n",
+ " else:\n",
+ " return sum_val(n - 1) + n\n",
+ "\n",
+ "\n",
+ "print(sum_val(10))"
+ ],
+ "cell_type": "code",
+ "outputs": [
+ {
+ "output_type": "stream",
+ "name": "stdout",
+ "text": [
+ "55\n"
+ ]
+ }
+ ],
+ "execution_count": null
+ }
+ ]
+}
diff --git a/static/recursion/tri.ipynb b/static/recursion/tri.ipynb
new file mode 100644
index 000000000..15561e0ea
--- /dev/null
+++ b/static/recursion/tri.ipynb
@@ -0,0 +1,35 @@
+{
+ "nbformat": 4,
+ "nbformat_minor": 2,
+ "metadata": {},
+ "cells": [
+ {
+ "metadata": {},
+ "source": [
+ "def tri(n):\n",
+ " if n == 0:\n",
+ " return 0\n",
+ " elif n == 1:\n",
+ " return 0\n",
+ " elif n == 2:\n",
+ " return 1\n",
+ " else:\n",
+ " return tri(n - 1) + tri(n - 2) + tri(n - 3)\n",
+ "\n",
+ "\n",
+ "print(tri(10))"
+ ],
+ "cell_type": "code",
+ "outputs": [
+ {
+ "output_type": "stream",
+ "name": "stdout",
+ "text": [
+ "81\n"
+ ]
+ }
+ ],
+ "execution_count": null
+ }
+ ]
+}