> For the complete documentation index, see [llms.txt](https://jaywin.gitbook.io/leetcode/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jaywin.gitbook.io/leetcode/solutions/1450-number-of-students-doing-homework-at-a-given-time.md).

# 1450. Number of Students Doing Homework at a Given Time

<https://leetcode.com/problems/number-of-students-doing-homework-at-a-given-time>

## Description

Given two integer arrays `startTime` and `endTime` and given an integer `queryTime`.

The `ith` student started doing their homework at the time `startTime[i]` and finished it at time `endTime[i]`.

Return *the number of students* doing their homework at time `queryTime`. More formally, return the number of students where `queryTime` lays in the interval `[startTime[i], endTime[i]]` inclusive.

**Example 1:**

```
**Input:** startTime = [1,2,3], endTime = [3,2,7], queryTime = 4
**Output:** 1
**Explanation:** We have 3 students where:
The first student started doing homework at time 1 and finished at time 3 and wasn't doing anything at time 4.
The second student started doing homework at time 2 and finished at time 2 and also wasn't doing anything at time 4.
The third student started doing homework at time 3 and finished at time 7 and was the only student doing homework at time 4.
```

**Example 2:**

```
**Input:** startTime = [4], endTime = [4], queryTime = 4
**Output:** 1
**Explanation:** The only student was doing their homework at the queryTime.
```

**Example 3:**

```
**Input:** startTime = [4], endTime = [4], queryTime = 5
**Output:** 0
```

**Example 4:**

```
**Input:** startTime = [1,1,1,1], endTime = [1,3,2,4], queryTime = 7
**Output:** 0
```

**Example 5:**

```
**Input:** startTime = [9,8,7,6,5,4,3,2,1], endTime = [10,10,10,10,10,10,10,10,10], queryTime = 5
**Output:** 5
```

**Constraints:**

* `startTime.length == endTime.length`
* `1 <= startTime.length <= 100`
* `1 <= startTime[i] <= endTime[i] <= 1000`
* `1 <= queryTime <= 1000`

## ac

```java
```