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<!doctype html>
<html lang="ja">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>LeetCode 70 - Climbing Stairs | フィボナッチDP</title>
<script src="https://unpkg.com/react@18/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
<script src="https://cdn.tailwindcss.com"></script>
<link
rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/themes/prism-tomorrow.min.css"
/>
<link
rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/plugins/line-numbers/prism-line-numbers.min.css"
/>
<link
rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/plugins/toolbar/prism-toolbar.min.css"
/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/prism.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/components/prism-python.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/components/prism-typescript.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/components/prism-rust.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/plugins/line-numbers/prism-line-numbers.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/plugins/toolbar/prism-toolbar.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/plugins/copy-to-clipboard/prism-copy-to-clipboard.min.js"></script>
<link
href="https://fonts.googleapis.com/css2?family=Outfit:wght@400;600;700;800;900&family=JetBrains+Mono:wght@400;600&family=Noto+Sans+JP:wght@400;500;700&display=swap"
rel="stylesheet"
/>
<style>
html {
scroll-behavior: smooth;
}
body {
font-family: 'Noto Sans JP', sans-serif;
}
.outfit {
font-family: 'Outfit', sans-serif;
}
.mono {
font-family: 'JetBrains Mono', monospace;
}
/* Prism toolbar override */
.code-toolbar > .toolbar {
top: 0.6em;
right: 0.8em;
opacity: 1 !important;
}
.code-toolbar > .toolbar .toolbar-item a,
.code-toolbar > .toolbar .toolbar-item button,
.code-toolbar > .toolbar .toolbar-item span {
background: #10b981 !important;
color: white !important;
border-radius: 6px !important;
padding: 3px 10px !important;
font-size: 12px !important;
border: none !important;
cursor: pointer !important;
box-shadow: none !important;
text-shadow: none !important;
}
.code-toolbar > .toolbar .toolbar-item button:hover,
.code-toolbar > .toolbar .toolbar-item a:hover {
background: #059669 !important;
color: white !important;
}
/* Step card transition */
.step-btn {
transition: all 0.18s cubic-bezier(0.4, 0, 0.2, 1);
}
/* Stair animation */
@keyframes stepUp {
0% {
transform: translateY(6px);
opacity: 0;
}
100% {
transform: translateY(0);
opacity: 1;
}
}
.stair-anim {
animation: stepUp 0.35s ease forwards;
}
/* Fibonacci highlight */
@keyframes fibPulse {
0%,
100% {
box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
}
50% {
box-shadow: 0 0 0 6px rgba(16, 185, 129, 0.25);
}
}
.fib-pulse {
animation: fibPulse 1.2s ease-in-out infinite;
}
</style>
</head>
<body class="bg-[linear-gradient(135deg,#f0fdf4,#e0f2fe)] min-h-screen">
<div class="max-w-5xl mx-auto px-4 py-8">
<!-- ===== HEADER ===== -->
<header
id="header"
class="mb-8 rounded-2xl p-8 shadow-[0_10px_30px_rgba(16,185,129,0.12)] bg-[linear-gradient(135deg,#d1fae5,#bfdbfe)]"
>
<div class="flex items-center gap-3 mb-2">
<span
class="bg-emerald-600 text-white text-sm font-bold px-3 py-1 rounded-full outfit"
>LeetCode 70</span
>
<span
class="bg-sky-500 text-white text-sm font-bold px-3 py-1 rounded-full outfit"
>Easy</span
>
<span
class="bg-violet-500 text-white text-sm font-bold px-3 py-1 rounded-full outfit"
>Dynamic Programming</span
>
</div>
<h1 class="outfit text-[2.4rem] font-extrabold text-teal-900 mb-1">
Climbing Stairs
</h1>
<p class="text-lg text-cyan-700 font-semibold mt-1">
フィボナッチDP（ローリング変数）による O(n) / O(1) 実装
</p>
<nav class="flex flex-wrap gap-3 mt-6">
<a
href="#overview"
class="inline-block px-4 py-2 font-semibold text-slate-700 no-underline rounded-lg border-2 border-slate-200 bg-white transition hover:shadow-[0_6px_16px_rgba(15,118,110,0.20)] hover:-translate-y-0.5 hover:bg-[linear-gradient(180deg,#e8fff6,#c8f1e1)] hover:border-teal-600 text-sm"
>概要</a
>
<a
href="#steps"
class="inline-block px-4 py-2 font-semibold text-slate-700 no-underline rounded-lg border-2 border-slate-200 bg-white transition hover:shadow-[0_6px_16px_rgba(15,118,110,0.20)] hover:-translate-y-0.5 hover:bg-[linear-gradient(180deg,#e8fff6,#c8f1e1)] hover:border-teal-600 text-sm"
>ステップ解説</a
>
<a
href="#fibonacci"
class="inline-block px-4 py-2 font-semibold text-slate-700 no-underline rounded-lg border-2 border-slate-200 bg-white transition hover:shadow-[0_6px_16px_rgba(15,118,110,0.20)] hover:-translate-y-0.5 hover:bg-[linear-gradient(180deg,#e8fff6,#c8f1e1)] hover:border-teal-600 text-sm"
>フィボナッチ可視化</a
>
<a
href="#code"
class="inline-block px-4 py-2 font-semibold text-slate-700 no-underline rounded-lg border-2 border-slate-200 bg-white transition hover:shadow-[0_6px_16px_rgba(15,118,110,0.20)] hover:-translate-y-0.5 hover:bg-[linear-gradient(180deg,#e8fff6,#c8f1e1)] hover:border-teal-600 text-sm"
>コード</a
>
<a
href="#diagram"
class="inline-block px-4 py-2 font-semibold text-slate-700 no-underline rounded-lg border-2 border-slate-200 bg-white transition hover:shadow-[0_6px_16px_rgba(15,118,110,0.20)] hover:-translate-y-0.5 hover:bg-[linear-gradient(180deg,#e8fff6,#c8f1e1)] hover:border-teal-600 text-sm"
>フローチャート</a
>
<a
href="#complexity"
class="inline-block px-4 py-2 font-semibold text-slate-700 no-underline rounded-lg border-2 border-slate-200 bg-white transition hover:shadow-[0_6px_16px_rgba(15,118,110,0.20)] hover:-translate-y-0.5 hover:bg-[linear-gradient(180deg,#e8fff6,#c8f1e1)] hover:border-teal-600 text-sm"
>計算量</a
>
</nav>
</header>
<!-- ===== OVERVIEW ===== -->
<section id="overview" class="bg-white rounded-2xl p-8 mb-8 shadow">
<h2
class="outfit text-[1.9rem] font-bold text-cyan-700 mb-4 pb-2 border-b-[3px] border-emerald-200"
>
アルゴリズム概要
</h2>
<!-- 指標カード (純粋HTML) -->
<div class="grid grid-cols-2 md:grid-cols-4 gap-3 mb-6">
<div
style="background: #d1fae5; color: #065f46"
class="rounded-xl p-3 text-center"
>
<div class="font-bold text-xs font-mono break-all leading-tight">O(n)</div>
<div class="text-xs mt-1">時間計算量</div>
</div>
<div
style="background: #bfdbfe; color: #1e40af"
class="rounded-xl p-3 text-center"
>
<div class="font-bold text-xs font-mono break-all leading-tight">O(1)</div>
<div class="text-xs mt-1">空間計算量</div>
</div>
<div
style="background: #fef3c7; color: #92400e"
class="rounded-xl p-3 text-center"
>
<div class="font-bold text-xs font-mono break-all leading-tight">
1 ≤ n ≤ 45
</div>
<div class="text-xs mt-1">制約</div>
</div>
<div
style="background: #ede9fe; color: #5b21b6"
class="rounded-xl p-3 text-center"
>
<div class="font-bold text-xs font-mono break-all leading-tight">
Fibonacci DP
</div>
<div class="text-xs mt-1">手法</div>
</div>
</div>
<!-- 問題文 -->
<div class="bg-slate-50 rounded-xl p-5 mb-4 border border-slate-200">
<h3 class="outfit font-bold text-teal-800 text-lg mb-2">問題文</h3>
<p class="text-slate-700 leading-7 text-sm">
<code
class="bg-emerald-100 text-emerald-800 px-1.5 py-0.5 rounded font-mono text-sm"
>n</code
>
段の階段を登ります。 毎回 <strong>1歩</strong> または
<strong>2歩</strong> だけ登れるとき、 頂上への
<strong>異なる登り方の総数</strong> を返してください。
</p>
</div>
<!-- 入出力例 -->
<div class="grid grid-cols-1 md:grid-cols-2 gap-4 mb-4">
<div class="bg-emerald-50 rounded-xl p-4 border border-emerald-200">
<div class="font-bold text-emerald-800 text-sm mb-2">Example 1</div>
<div class="font-mono text-xs text-slate-700 space-y-1">
<div>入力: <span class="text-emerald-700 font-bold">n = 2</span></div>
<div>出力: <span class="text-emerald-700 font-bold">2</span></div>
<div class="text-slate-500 mt-2">1+1 / 2</div>
</div>
</div>
<div class="bg-sky-50 rounded-xl p-4 border border-sky-200">
<div class="font-bold text-sky-800 text-sm mb-2">Example 2</div>
<div class="font-mono text-xs text-slate-700 space-y-1">
<div>入力: <span class="text-sky-700 font-bold">n = 3</span></div>
<div>出力: <span class="text-sky-700 font-bold">3</span></div>
<div class="text-slate-500 mt-2">1+1+1 / 1+2 / 2+1</div>
</div>
</div>
</div>
<!-- 本質 -->
<div class="bg-amber-50 rounded-xl p-5 border border-amber-200">
<div class="font-bold text-amber-800 mb-2">💡 問題の本質</div>
<p class="text-slate-700 text-sm leading-7">
n段目に到達するには <strong>必ず</strong> 直前の2パターンから来る：<br />
① (n-1)段目から<strong>1歩</strong> ② (n-2)段目から<strong>2歩</strong
><br />
よって
<code class="bg-amber-100 text-amber-900 px-1.5 py-0.5 rounded font-mono"
>f(n) = f(n-1) + f(n-2)</code
>
→ <strong>フィボナッチ数列そのもの！</strong>
</p>
</div>
</section>
<!-- ===== STEPS (React) ===== -->
<section id="steps" class="bg-white rounded-2xl p-8 mb-8 shadow">
<h2
class="outfit text-[1.9rem] font-bold text-cyan-700 mb-4 pb-2 border-b-[3px] border-emerald-200"
>
ステップバイステップ解説
</h2>
<div id="steps-root"></div>
</section>
<!-- ===== FIBONACCI VISUALIZER (React) ===== -->
<section id="fibonacci" class="bg-white rounded-2xl p-8 mb-8 shadow">
<h2
class="outfit text-[1.9rem] font-bold text-cyan-700 mb-4 pb-2 border-b-[3px] border-emerald-200"
>
フィボナッチ数列 インタラクティブ可視化
</h2>
<div id="fib-root"></div>
</section>
<!-- ===== CODE ===== -->
<section id="code" class="bg-white rounded-2xl p-8 mb-8 shadow">
<h2
class="outfit text-[1.9rem] font-bold text-cyan-700 mb-4 pb-2 border-b-[3px] border-emerald-200"
>
Python 実装
</h2>
<!-- タブ切り替え (React) -->
<div id="code-root"></div>
</section>
<!-- ===== FLOWCHART ===== -->
<section id="diagram" class="bg-white rounded-2xl p-8 mb-8 shadow">
<h2
class="outfit text-[1.9rem] font-bold text-cyan-700 mb-4 pb-2 border-b-[3px] border-emerald-200"
>
処理フローチャート
</h2>
<div class="mt-5 overflow-x-auto">
<!--
viewBox設計:
- 幅: 560px固定（center x=280）
- ボックス: x=60, width=440（60〜500）で統一
- 終了楕円: cy=870, ry=28 → 下端=898 → viewBox高さ=940
- 全テキスト: x=280, text-anchor="middle" で中央揃え
- SVG属性: ケバブケース使用
-->
<svg
viewBox="0 0 560 940"
style="
max-width: 560px;
width: 100%;
height: auto;
display: block;
margin: 0 auto;
"
role="img"
aria-label="Climbing Stairs アルゴリズムのフローチャート"
>
<defs>
<marker
id="fc-arrow"
markerWidth="10"
markerHeight="10"
refX="9"
refY="3"
orient="auto"
markerUnits="strokeWidth"
>
<path d="M0,0 L0,6 L9,3 z" fill="#64748b" />
</marker>
<marker
id="fc-arrowGreen"
markerWidth="10"
markerHeight="10"
refX="9"
refY="3"
orient="auto"
markerUnits="strokeWidth"
>
<path d="M0,0 L0,6 L9,3 z" fill="#059669" />
</marker>
<marker
id="fc-arrowRed"
markerWidth="10"
markerHeight="10"
refX="9"
refY="3"
orient="auto"
markerUnits="strokeWidth"
>
<path d="M0,0 L0,6 L9,3 z" fill="#dc2626" />
</marker>
<marker
id="fc-arrowPurple"
markerWidth="10"
markerHeight="10"
refX="9"
refY="3"
orient="auto"
markerUnits="strokeWidth"
>
<path d="M0,0 L0,6 L9,3 z" fill="#a855f7" />
</marker>
</defs>
<!-- 開始（楕円） -->
<ellipse
cx="280"
cy="48"
rx="110"
ry="28"
fill="#d1fae5"
stroke="#10b981"
stroke-width="2"
/>
<text
x="280"
y="48"
text-anchor="middle"
dominant-baseline="middle"
font-size="16"
font-weight="bold"
fill="#065f46"
font-family="Outfit,sans-serif"
>
開始
</text>
<line
x1="280"
y1="76"
x2="280"
y2="103"
stroke="#64748b"
stroke-width="2"
marker-end="url(#fc-arrow)"
/>
<!-- 入力 -->
<rect
x="60"
y="108"
width="440"
height="52"
rx="10"
fill="#e0f2fe"
stroke="#0284c7"
stroke-width="2"
/>
<text
x="280"
y="126"
text-anchor="middle"
dominant-baseline="middle"
font-size="14"
font-weight="bold"
fill="#0c4a6e"
font-family="Outfit,sans-serif"
>
入力受け取り
</text>
<text
x="280"
y="148"
text-anchor="middle"
dominant-baseline="middle"
font-size="12"
fill="#0369a1"
font-family="JetBrains Mono,monospace"
>
n: int (1 <= n <= 45)
</text>
<line
x1="280"
y1="160"
x2="280"
y2="187"
stroke="#64748b"
stroke-width="2"
marker-end="url(#fc-arrow)"
/>
<!-- 条件1: n <= 2 ? -->
<polygon
points="280,192 460,240 280,288 100,240"
fill="#fef3c7"
stroke="#f59e0b"
stroke-width="2"
/>
<text
x="280"
y="234"
text-anchor="middle"
dominant-baseline="middle"
font-size="13"
font-weight="bold"
fill="#78350f"
font-family="Outfit,sans-serif"
>
n <= 2 ?
</text>
<!-- Yes: 右へ水平 → 折れ線でreturn nボックス上端へ -->
<!-- 水平線（矢印なし） -->
<line
x1="460"
y1="240"
x2="520"
y2="240"
stroke="#059669"
stroke-width="2"
/>
<text
x="488"
y="230"
text-anchor="middle"
font-size="11"
fill="#059669"
font-weight="bold"
>
Yes
</text>
<!-- 垂直線（矢印あり）→ return n ボックス上端へ -->
<line
x1="520"
y1="240"
x2="520"
y2="267"
stroke="#059669"
stroke-width="2"
marker-end="url(#fc-arrowGreen)"
/>
<rect
x="488"
y="267"
width="66"
height="34"
rx="8"
fill="#d1fae5"
stroke="#059669"
stroke-width="2"
/>
<text
x="521"
y="284"
text-anchor="middle"
dominant-baseline="middle"
font-size="12"
font-weight="bold"
fill="#065f46"
>
return n
</text>
<!-- No: 下 -->
<line
x1="280"
y1="288"
x2="280"
y2="315"
stroke="#dc2626"
stroke-width="2"
marker-end="url(#fc-arrowRed)"
/>
<text
x="258"
y="304"
text-anchor="middle"
font-size="11"
fill="#dc2626"
font-weight="bold"
>
No
</text>
<!-- 初期化 -->
<rect
x="60"
y="320"
width="440"
height="70"
rx="10"
fill="#f1f5f9"
stroke="#64748b"
stroke-width="2"
/>
<text
x="280"
y="340"
text-anchor="middle"
dominant-baseline="middle"
font-size="14"
font-weight="bold"
fill="#1e293b"
font-family="Outfit,sans-serif"
>
変数初期化
</text>
<line
x1="80"
y1="353"
x2="480"
y2="353"
stroke="#cbd5e1"
stroke-width="1"
/>
<text
x="280"
y="370"
text-anchor="middle"
dominant-baseline="middle"
font-size="12"
fill="#475569"
font-family="JetBrains Mono,monospace"
>
prev2 = 1 (f1) prev1 = 2 (f2)
</text>
<line
x1="280"
y1="390"
x2="280"
y2="417"
stroke="#64748b"
stroke-width="2"
marker-end="url(#fc-arrow)"
/>
<!-- ループ条件 -->
<polygon
points="280,422 460,470 280,518 100,470"
fill="#fef3c7"
stroke="#f59e0b"
stroke-width="2"
/>
<text
x="280"
y="464"
text-anchor="middle"
dominant-baseline="middle"
font-size="12"
font-weight="bold"
fill="#78350f"
font-family="Outfit,sans-serif"
>
ループ残り > 0 ?
</text>
<!-- ループ Yes: 下 → ローリング更新へ -->
<line
x1="280"
y1="518"
x2="280"
y2="545"
stroke="#059669"
stroke-width="2"
marker-end="url(#fc-arrowGreen)"
/>
<text
x="258"
y="534"
text-anchor="middle"
font-size="11"
fill="#059669"
font-weight="bold"
>
Yes
</text>
<!-- ローリング更新 -->
<rect
x="60"
y="550"
width="440"
height="70"
rx="10"
fill="#ede9fe"
stroke="#a855f7"
stroke-width="2"
/>
<text
x="280"
y="570"
text-anchor="middle"
dominant-baseline="middle"
font-size="14"
font-weight="bold"
fill="#4c1d95"
font-family="Outfit,sans-serif"
>
ローリング更新（タプル代入）
</text>
<line
x1="80"
y1="583"
x2="480"
y2="583"
stroke="#ddd6fe"
stroke-width="1"
/>
<text
x="280"
y="602"
text-anchor="middle"
dominant-baseline="middle"
font-size="12"
fill="#5b21b6"
font-family="JetBrains Mono,monospace"
>
prev2, prev1 = prev1, prev1 + prev2
</text>
<!-- ループバック（左側：ローリング更新 → ループ条件） -->
<line x1="60" y1="585" x2="30" y2="585" stroke="#a855f7" stroke-width="2" />
<line x1="30" y1="585" x2="30" y2="470" stroke="#a855f7" stroke-width="2" />
<line
x1="30"
y1="470"
x2="98"
y2="470"
stroke="#a855f7"
stroke-width="2"
marker-end="url(#fc-arrowPurple)"
/>
<text
x="14"
y="530"
text-anchor="middle"
font-size="11"
fill="#a855f7"
font-weight="bold"
transform="rotate(-90, 14, 530)"
>
ループバック
</text>
<!--
ループ No: 右→下→左 の折れ線で「結果を返す」ボックス右端へ直接接続
経路: (460,470) → (545,470) → (545,687) → (502,687)
結果を返すボックス: x=60, y=652, w=440, h=70 → 右端x=500, center-y=687
-->
<text
x="498"
y="460"
text-anchor="middle"
font-size="11"
fill="#dc2626"
font-weight="bold"
>
No
</text>
<!-- 右へ水平 -->
<line
x1="460"
y1="470"
x2="545"
y2="470"
stroke="#dc2626"
stroke-width="2"
/>
<!-- 下へ垂直 -->
<line
x1="545"
y1="470"
x2="545"
y2="687"
stroke="#dc2626"
stroke-width="2"
/>
<!-- 左へ水平（矢印あり）→ 結果を返すボックス右端へ -->
<line
x1="545"
y1="687"
x2="502"
y2="687"
stroke="#dc2626"
stroke-width="2"
marker-end="url(#fc-arrowRed)"
/>
<!-- 出力 -->
<rect
x="60"
y="652"
width="440"
height="70"
rx="12"
fill="#d1fae5"
stroke="#059669"
stroke-width="2.5"
/>
<text
x="280"
y="672"
text-anchor="middle"
dominant-baseline="middle"
font-size="14"
font-weight="bold"
fill="#065f46"
font-family="Outfit,sans-serif"
>
結果を返す
</text>
<line
x1="80"
y1="685"
x2="480"
y2="685"
stroke="#a7f3d0"
stroke-width="1"
/>
<text
x="280"
y="703"
text-anchor="middle"
dominant-baseline="middle"
font-size="12"
fill="#047857"
font-family="JetBrains Mono,monospace"
>
return prev1 → f(n) の値
</text>
<line
x1="280"
y1="722"
x2="280"
y2="749"
stroke="#059669"
stroke-width="2"
marker-end="url(#fc-arrowGreen)"
/>
<!-- 終了（楕円）: cy=777, ry=28 → 下端=805, viewBox=940 で余裕あり -->
<ellipse
cx="280"
cy="777"
rx="110"
ry="28"
fill="#d1fae5"
stroke="#10b981"
stroke-width="2"
/>
<text
x="280"
y="777"
text-anchor="middle"
dominant-baseline="middle"
font-size="16"
font-weight="bold"
fill="#065f46"
font-family="Outfit,sans-serif"
>
終了
</text>
<!-- 凡例 -->
<rect
x="60"
y="830"
width="440"
height="88"
rx="10"
fill="#f8fafc"
stroke="#e2e8f0"
stroke-width="1.5"
/>
<text
x="280"
y="850"
text-anchor="middle"
dominant-baseline="middle"
font-size="12"
font-weight="bold"
fill="#475569"
>
凡例
</text>
<line
x1="80"
y1="860"
x2="480"
y2="860"
stroke="#e2e8f0"
stroke-width="1"
/>
<ellipse
cx="100"
cy="878"
rx="18"
ry="10"
fill="#d1fae5"
stroke="#10b981"
stroke-width="1.5"
/>
<text
x="100"
y="878"
text-anchor="middle"
dominant-baseline="middle"
font-size="9"
fill="#065f46"
>
開始/終了
</text>
<rect
x="140"
y="869"
width="60"
height="18"
rx="4"
fill="#e0f2fe"
stroke="#0284c7"
stroke-width="1.5"
/>
<text
x="170"
y="878"
text-anchor="middle"
dominant-baseline="middle"
font-size="9"
fill="#0c4a6e"
>
処理
</text>
<polygon
points="240,878 260,868 280,878 260,888"
fill="#fef3c7"
stroke="#f59e0b"
stroke-width="1.5"
/>
<text
x="260"
y="878"
text-anchor="middle"
dominant-baseline="middle"
font-size="9"
fill="#78350f"
>
条件
</text>
<rect
x="300"
y="869"
width="60"
height="18"
rx="4"
fill="#ede9fe"
stroke="#a855f7"
stroke-width="1.5"
/>
<text
x="330"
y="878"
text-anchor="middle"
dominant-baseline="middle"
font-size="9"
fill="#4c1d95"
>
DP更新
</text>
<rect
x="380"
y="869"
width="60"
height="18"
rx="4"
fill="#d1fae5"
stroke="#059669"
stroke-width="1.5"
/>
<text
x="410"
y="878"
text-anchor="middle"
dominant-baseline="middle"
font-size="9"
fill="#065f46"
>
出力
</text>
<text
x="280"
y="905"
text-anchor="middle"
dominant-baseline="middle"
font-size="10"
fill="#94a3b8"
>
紫の矢印 = ループバック / 緑の矢印 = 成功パス / 赤の矢印 = 条件分岐
</text>
</svg>
</div>
<p class="mt-6 text-slate-700 leading-8 text-sm">
<strong class="text-lg text-teal-800">フローの説明：</strong><br />
1. 入力
<code class="bg-slate-100 px-1 rounded font-mono">n</code> を受け取り、<code
class="bg-slate-100 px-1 rounded font-mono"
>n ≤ 2</code
>
なら即
<code class="bg-slate-100 px-1 rounded font-mono">n</code>
を返す（基底条件）。<br />
2.
<code class="bg-slate-100 px-1 rounded font-mono">prev2=1, prev1=2</code>
で初期化後、<code class="bg-slate-100 px-1 rounded font-mono">n-2</code>
回ループで更新。<br />
3. タプル代入
<code class="bg-slate-100 px-1 rounded font-mono"
>prev2, prev1 = prev1, prev1+prev2</code
>
で一時変数ゼロの安全なローリング更新。<br />
4. ループ終了後に
<code class="bg-slate-100 px-1 rounded font-mono">prev1</code>（= f(n)）を返す。
</p>
</section>
<!-- ===== COMPLEXITY ===== -->
<section id="complexity" class="bg-white rounded-2xl p-8 mb-8 shadow">
<h2
class="outfit text-[1.9rem] font-bold text-cyan-700 mb-4 pb-2 border-b-[3px] border-emerald-200"
>
計算量分析
</h2>
<div class="overflow-x-auto">
<table class="w-full text-sm border-collapse">
<thead>
<tr class="bg-emerald-50">
<th
class="text-left p-3 border border-emerald-200 text-teal-800 font-bold"
>
アプローチ
</th>
<th