quicksort.ipynb

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   "source": [
    "import random"
   ]
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   "source": [
    "def quicksort(xs):\n",
    "    def sort(xs, l, r):\n",
    "        if (l == r):\n",
    "            return\n",
    "        \n",
    "        i, j = l, r\n",
    "        pivot = xs[(i + j) / 2]\n",
    "        \n",
    "        while (i <= j):\n",
    "            while (xs[i] < pivot):\n",
    "                i += 1\n",
    "            while (pivot < xs[j]):\n",
    "                j -= 1\n",
    "            \n",
    "            if (i <= j):\n",
    "                xs[i], xs[j] = xs[j], xs[i]\n",
    "                \n",
    "                i += 1\n",
    "                j -= 1\n",
    "    \n",
    "    i, j = 0, len(xs) - 1\n",
    "    sort(xs, i, j)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def create_list(sz=10, lo=-1024, hi=1024, seed=42):\n",
    "    random.seed(seed)\n",
    "    \n",
    "    xs = [random.randint(lo, hi) for i in range(sz)]\n",
    "    \n",
    "    return xs"
   ]
  }
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