158. Task Scheduler

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Input: tasks = ["A","A","A","B","B","B"], n = 2

Output: 8

Explanation: The tasks can be scheduled as A -> B -> idle -> A -> B -> idle -> A -> B, requiring 8 intervals.

Input: tasks = ["A","C","A","B","D","B"], n = 1

Output: 6

Explanation: The tasks can be scheduled as A -> B -> C -> D -> A -> B, requiring 6 intervals.

Input: tasks = ["A","A","A", "B","B","B"], n = 3

Output: 10

Explanation: The tasks can be scheduled as A -> B -> idle -> idle -> A -> B -> idle -> idle -> A -> B, requiring 10 intervals.

Time Complexity

O(log K)

Space Complexity

O(N log K)