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   "source": [
    "# [35. 搜索插入位置](https://leetcode.cn/problems/search-insert-position)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 题目描述\n",
    "\n",
    " 给定一个排序数组和一个目标值，在数组中找到目标值，并返回其索引。如果目标值不存在于数组中，返回它将会被按顺序插入的位置。\n",
    "\n",
    "请必须使用时间复杂度为 `O(log n)` 的算法。\n",
    "\n",
    "**示例 1:**\n",
    "\n",
    "```txt\n",
    "输入: nums = [1,3,5,6], target = 5\n",
    "输出: 2\n",
    "```\n",
    "\n",
    "**示例 2:**\n",
    "\n",
    "```txt\n",
    "输入: nums = [1,3,5,6], target = 2\n",
    "输出: 1\n",
    "```\n",
    "\n",
    "**示例 3:**\n",
    "\n",
    "```txt\n",
    "输入: nums = [1,3,5,6], target = 7\n",
    "输出: 4\n",
    "```\n",
    "\n",
    "**提示:**\n",
    "\n",
    "-   `1 <= nums.length <= 10^4`\n",
    "-   `-10^4 <= nums[i] <= 10^4`\n",
    "-   `nums` 为 **无重复元素** 的 **升序** 排列数组\n",
    "-   `-10^4 <= target <= 10^4`"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 解答\n",
    "\n",
    " "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "class Solution(object):\n",
    "    def searchInsert(self, nums, target):\n",
    "        \"\"\"\n",
    "        :type nums: List[int]\n",
    "        :type target: int\n",
    "        :rtype: int\n",
    "        \"\"\"\n",
    "        left, right = 0, len(nums) - 1\n",
    "        while left < right:\n",
    "            mid = (left + right) // 2\n",
    "            if target > nums[mid]:\n",
    "                left = mid + 1\n",
    "            elif target < nums[mid]:\n",
    "                right = mid\n",
    "            else:\n",
    "                return mid \n",
    "        return left if nums[left] >= target else left + 1  # 注意这里的返回值 注意溢出"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "a1e23e83",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "4\n"
     ]
    }
   ],
   "source": [
    "test_nums = [1,3,5,6]\n",
    "test_target = 7\n",
    "solution_1 = Solution()\n",
    "result_1 = solution_1.searchInsert(test_nums, test_target)\n",
    "print(result_1) # 2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "92764a56",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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