leetcode-go/medium/621.task-scheduler.go

func leastInterval(tasks []byte, n int) int {
	freq := make([]int, 26)
	for _, t := range tasks {
		freq[t-'A']++
	}
	sort.Ints(freq)
	max, cnt := freq[25], 0
	for _, i := range freq {
		if i == max {
			cnt++
		}
	}
	return (max-1)*n + cnt
}