Fix second round review feedback

- Add step-arrow marker to result SVG to fix missing arrow heads
- Unify time complexity to O(√n + d·log n) across all HTML sections
- Remove unnecessary stepsData.length from useEffect dependencies
- Refactor test code to use show_divisor_details helper function

Author: myoshi2891

Mathematics/Fundamentals/HackerRank/Claude/Easy/Best Divisor/BestDivisor.html

@@ -83,7 +83,7 @@
             >
                 <h1 class="text-[2.5rem] font-bold text-teal-800 mb-2">Best Divisor</h1>
                 <p class="text-xl text-cyan-700 font-semibold mt-2">
-                    √n約数列挙+桁和比較 による O(√n) 実装
+                    √n約数列挙+桁和比較 による O(√n + d·log n) 実装
                 </p>
                 <nav class="flex flex-wrap gap-4 mt-6">
                     <a
@@ -171,8 +171,8 @@ <h3 class="text-xl font-bold text-teal-800 mt-6 mb-3">戦略</h3>
                 <h3 class="text-xl font-bold text-teal-800 mt-6 mb-3">主要ポイント</h3>
                 <ul class="list-disc list-inside space-y-2 text-slate-700 ml-4">
                     <li>
-                        <strong>時間計算量:</strong> O(√n) - √n までのループ + O(d log d)
-                        の桁和計算（d は約数の個数）
+                        <strong>時間計算量:</strong> O(√n + d·log n) - √n までのループ +
+                        各約数の桁和計算 O(log n)
                     </li>
                     <li><strong>空間計算量:</strong> O(d) - 約数リストの保存</li>
                     <li>
@@ -1085,10 +1085,10 @@ <h3 class="text-lg font-bold text-slate-700 mb-3">📖 フローチャートの
                                 <td class="border-2 border-slate-200 px-4 py-3">
                                     <span
                                         class="px-3 py-1 bg-emerald-100 text-emerald-800 rounded-full font-mono font-bold"
-                                        >O(√n)</span
+                                        >O(√n + d·log n)</span
                                     >
                                     <div class="text-sm text-slate-600 mt-1">
-                                        √n までループ + O(d log d) 桁和計算
+                                        √n までループ + 各約数の桁和計算 O(log n)
                                     </div>
                                 </td>
                                 <td class="border-2 border-slate-200 px-4 py-3">
@@ -1967,6 +1967,19 @@ <h3 class="text-xl font-bold text-teal-800 mt-8 mb-3">具体例での計算量</
                             viewBox="0 0 600 250"
                             style={{ maxWidth: '100%', height: 'auto', marginTop: '20px' }}
                         >
+                            <defs>
+                                <marker
+                                    id="step-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>
+                            </defs>
                             {/* Input */}
                             <rect
                                 x="50"
@@ -2131,7 +2144,7 @@ <h3 class="text-xl font-bold text-teal-800 mt-8 mb-3">具体例での計算量</
                     return () => {
                         if (timerRef.current) clearTimeout(timerRef.current);
                     };
-                }, [isPlaying, activeStep, stepsData.length]);
+                }, [isPlaying, activeStep]);
 
                 const handlePlay = () => {
                     if (isPlaying) return;

Mathematics/Fundamentals/HackerRank/Claude/Easy/Best Divisor/BestDivisor.ipynb

@@ -112,23 +112,26 @@
                 "    status = \"✓\" if result == expected else \"✗\"\n",
                 "    print(f\"{status} n={n}: expected={expected}, got={result}\")\n",
                 "\n",
-                "# 詳細デバッグ用\n",
-                "print(\"\\n=== n=12 の詳細 ===\")\n",
-                "n = 12\n",
-                "divisors = []\n",
-                "i = 1\n",
-                "while i * i <= n:\n",
-                "    if n % i == 0:\n",
-                "        divisors.append(i)\n",
-                "        if i != n // i:\n",
-                "            divisors.append(n // i)\n",
-                "    i += 1\n",
-                "\n",
-                "print(f\"約数: {sorted(divisors)}\")\n",
-                "for d in sorted(divisors):\n",
-                "    digit_sum = sum(int(digit) for digit in str(d))\n",
-                "    print(f\"  {d} → 桁和 = {digit_sum}\")\n",
-                "print(f\"最良約数: {findBestDivisor(n)}\")"
+                "# 詳細デバッグ用（n=12 の例）\n",
+                "def show_divisor_details(n):\n",
+                "    \"\"\"約数とその桁和を表示するヘルパー関数\"\"\"\n",
+                "    divisors = []\n",
+                "    i = 1\n",
+                "    while i * i <= n:\n",
+                "        if n % i == 0:\n",
+                "            divisors.append(i)\n",
+                "            if i != n // i:\n",
+                "                divisors.append(n // i)\n",
+                "        i += 1\n",
+                "    \n",
+                "    print(f\"\\n=== n={n} の詳細 ===\")\n",
+                "    print(f\"約数: {sorted(divisors)}\")\n",
+                "    for d in sorted(divisors):\n",
+                "        digit_sum = sum(int(digit) for digit in str(d))\n",
+                "        print(f\"  {d} → 桁和 = {digit_sum}\")\n",
+                "    print(f\"最良約数: {findBestDivisor(n)}\")\n",
+                "\n",
+                "show_divisor_details(12)"
             ]
         },
         {