> For the complete documentation index, see [llms.txt](https://leetcodebook-1.gitbook.io/top-interview-150/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://leetcodebook-1.gitbook.io/top-interview-150/array-string/h-index.md).

# H指数

题目链接: <https://leetcode.cn/problems/h-index>

## 解题思路：

1. h指数的条件为`引用数大于等于某个值，且满足引用数大于等于某个值的文章数量也大于等于这个值`
2. 所以我们只需要对数组进行排序，对排序后的数组进行遍历
3. 判断每个引用数到数组末尾一共多少个引用数，这些引用数一定是大于等于当前这个引用数的，找出最大的那个值就可以了

```go
func hIndex(citations []int) int {
	sort.Ints(citations)
	max := 0
	length := len(citations)
	for idx, item := range citations {
		count := length - idx
		if item >= count && count > max {
			max = count
		}
	}
	return max
}
```

## 复杂度分析一

* **时间复杂度：** 对数组进行了一次遍历，因此时间复杂度为 $$O(n)$$，其中 $$n$$ 是数组 $$citations$$ 的长度
* **空间复杂度：** 空间复杂度为 $$O(1)$$


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://leetcodebook-1.gitbook.io/top-interview-150/array-string/h-index.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.