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
}