1450. Number of Students Doing Homework at a Given Time

Easy

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.

Constraints:

• startTime.length == endTime.length

• 1 <= startTime.length <= 100

• 1 <= startTime[i] <= endTime[i] <= 1000

• 1 <= queryTime <= 1000

解題

func busyStudent(startTime []int, endTime []int, queryTime int) int {
    res := 0

    for i := 0; i < len(startTime); i++ {
        if queryTime >= startTime[i] && queryTime <= endTime[i] {
            res++
        }
    }

    return res
}