数组和字符串/26_删除排序数组中的重复项.ipynb

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   "source": [
    "此题为leetcode [第26题](https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array/)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "题目要求原地操作，即在数字本身上面进行修改，\n",
    "\n",
    "这里引入一个索引`index`,用来记录新数组的长度，初始化为0\n",
    "\n",
    "遍历输入数组，碰到数组中比`index`处大的值，就把这个值放到`index`后面，然后`index`+1，最后`index+1`的值就是新数组的长度"
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   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "class Solution:\n",
    "    def removeDuplicates(self, nums):\n",
    "        \"\"\"\n",
    "        :type nums: List[int]\n",
    "        :rtype: int\n",
    "        \"\"\"\n",
    "        l = len(nums)\n",
    "        if l == 0:\n",
    "            return 0\n",
    "        if l == 1:\n",
    "            return 1\n",
    "        idx = 0\n",
    "        for i in range(0,l):\n",
    "            if nums[i] > nums[idx]:\n",
    "                idx += 1\n",
    "                nums[idx] = nums[i]\n",
    "        return idx +1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "2"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s = Solution()\n",
    "s.removeDuplicates([1,1,2])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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