> For the complete documentation index, see [llms.txt](https://shangan.gitbook.io/gong-kai-ke/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://shangan.gitbook.io/gong-kai-ke/untitled-2/ke-hou-lian-xi/find-first-and-last-position-of-element-in-sorted-array.md).

# Find First and Last Position of Element in Sorted Array

![](https://gblobscdn.gitbook.com/assets%2F-MQQ_aKuDz0ArQY9xrTi%2F-MQQ_hCHEF_NfTLb7c5f%2F-MQQhK6lAaBSDTrKohkL%2FWechatIMG22.png?alt=media\&token=90bc890e-7a68-4f04-84cc-c23bbda959bd)

```java
/*
 本算法答案由上岸科技提供。
 上岸科技是一个专致力于高效培养北美留学生拥有实际面试能力的团体。
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 正如我们的信仰：我们教的是如何上岸而不仅是算法。
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*/
class Solution {
    public int[] searchRange(int[] nums, int target) {
        if (nums == null || nums.length == 0) {
            return new int[]{-1, -1};
        }
        int left = searchLeft(nums, target);
        int right = searchRight(nums, target);
        return new int[]{left, right};
    }
    
    private int searchLeft(int[] nums, int target) {
        int left = 0;
        int right = nums.length - 1;
        while (left + 1 < right) {
            int mid = left + (right - left) / 2;
            if (nums[mid] >= target) {
                right = mid;
            } else {
                left = mid;
            }
        }
        if (nums[left] == target) {
            return left;
        }
        return nums[right] == target ? right : -1;
    }
    
    private int searchRight(int[] nums, int target) {
        int left = 0;
        int right = nums.length - 1;
        while (left + 1 < right) {
            int mid = left + (right - left) / 2;
            if (nums[mid] <= target) {
                left = mid;
            } else {
                right = mid;
            }
        }
        if (nums[right] == target) {
            return right;
        }
        return nums[left] == target ? left : -1;
    }
}
```

![](https://gblobscdn.gitbook.com/assets%2F-MQQ_aKuDz0ArQY9xrTi%2F-MQQ_hCHEF_NfTLb7c5f%2F-MQQhNaEDp_XdzFm0Ypp%2FWechatIMG23.png?alt=media\&token=0eec3fd8-70e7-4ac4-93e9-6cec19015bdb)