Number of Students Doing Homework at a Given Time

Difficulty: Easy
111 / 111 test cases passed.
Runtime: 36 ms
Memory Usage: 13.7 MB

Author: YuriSpiridonov

Easy/1450.NumberofStudentsDoingHomeworkataGivenTime.py

@@ -0,0 +1,42 @@
+"""
+    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:
+    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.
+    
+    Constraints:
+    - startTime.length == endTime.length
+    - 1 <= startTime.length <= 100
+    - 1 <= startTime[i] <= endTime[i] <= 1000
+    - 1 <= queryTime <= 1000             
+"""
+#Difficulty: Easy
+#111 / 111 test cases passed.
+#Runtime: 36 ms
+#Memory Usage: 13.7 MB
+
+#Runtime: 36 ms, faster than 87.04% of Python3 online submissions for Number of Students Doing Homework at a Given Time.
+#Memory Usage: 13.7 MB, less than 100.00% of Python3 online submissions for Number of Students Doing Homework at a Given Time.
+
+class Solution:
+    def busyStudent(self, startTime: List[int], endTime: List[int], queryTime: int) -> int:
+        number_of_students = 0
+        for i, start_time in enumerate(startTime):
+            if queryTime in range(start_time, endTime[i]+1):
+                number_of_students += 1
+        return number_of_students