10215501439.wrr.lesson5.ipynb

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     "text": [
      "[2, 3, 6, 9, 34, 39, 67]\n"
     ]
    }
   ],
   "source": [
    "def bubblesort(a):\n",
    "    num=len(a)\n",
    "    for i in range(num):\n",
    "        for j in range(num-i-1):\n",
    "            if(a[j]>a[j+1]):\n",
    "                a[j],a[j+1]=a[j+1],a[j]#python特有的交换的等式\n",
    "    print(a)\n",
    "    \n",
    "a=[34,67,2,9,3,6,39]\n",
    "bubblesort(a)"
   ]
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     "text": [
      "6.435983713\n",
      "0.018747234000000113\n"
     ]
    }
   ],
   "source": [
    "import random\n",
    "import time\n",
    "\n",
    "def quick_sort(arr, left, right):\n",
    "    if (left >= right):\n",
    "        return\n",
    "    pivot = arr[left]\n",
    "    i = left\n",
    "    j = right\n",
    "    while i < j:\n",
    "        while i < j and arr[j] >= pivot:\n",
    "            j -= 1\n",
    "        arr[i] = arr[j]\n",
    "        while i < j and arr[i] < pivot:\n",
    "            i += 1\n",
    "        arr[j] = arr[i]\n",
    "    arr[i] = pivot\n",
    "    quick_sort(arr, left, i-1)\n",
    "    quick_sort(arr, i+1, right)\n",
    "\n",
    "def bubblesort(a):\n",
    "    num=len(a)\n",
    "    for i in range(num):\n",
    "        for j in range(num-i-1):\n",
    "            if(a[j]>a[j+1]):\n",
    "                a[j],a[j+1]=a[j+1],a[j]#python特有的交换的等式\n",
    "                \n",
    "#随机生成一个较大的数组，为了保证影响因素不包括数组内容，所以copy数组一的内容\n",
    "arr1 = []\n",
    "for i in range(10000):\n",
    "    arr1.append(random.random())\n",
    "arr2 = arr1.copy()  \n",
    "\n",
    "#process_time是不包括睡眠时间的\n",
    "t_a = time.process_time()\n",
    "bubblesort(arr1)\n",
    "t_b = time.process_time()\n",
    "print(t_b - t_a)\n",
    "\n",
    "t_a = time.process_time()\n",
    "quick_sort(arr2,0,len(arr2)-1)\n",
    "t_b = time.process_time()\n",
    "print(t_b - t_a)\n",
    "\n"
   ]
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