Solve 1700. Number of Students Unable to Eat Lunch

Using a deque to improve the speed of removing from the left side of the queue and rotating students to the back of the queue (from O(n) to O(1) amortized).

python/1700_number_of_students_unable_to_eat_lunch.py

@@ -0,0 +1,17 @@
+class Solution:
+    def countStudents(self, students: List[int], sandwiches: List[int]) -> int:
+        students = deque(students)
+        sandwiches = deque(sandwiches)
+        took_this_pass = True
+        while took_this_pass:
+            took_this_pass = False
+            for i in range(len(students)):
+                student = students[0]
+                sandwich = sandwiches[0]
+                if student == sandwich:
+                    students.popleft()
+                    sandwiches.popleft()
+                    took_this_pass = True
+                else:
+                    students.rotate(-1)
+        return len(students)