Leetcode Note: Go - Number of Students Doing Homework at a Given Time

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