import kotlin.math.ceil /** * 2870. Minimum Number of Operations to Make Array Empty * @see <a href="https://leetcode.com/problems/minimum-number-of-operations-to-make-array-empty">Source</a> */ fun interface MinOpToMakeArrayEmpty { operator fun invoke(nums: IntArray): Int } val minOpToMakeArrayEmptyCounting = MinOpToMakeArrayEmpty { nums -> val counter = mutableMapOf<Int, Int>() for (num in nums) { counter[num] = counter.getOrDefault(num, 0) + 1 } var ans = 0 for ((_, count) in counter) { if (count == 1) { return@MinOpToMakeArrayEmpty -1 } ans += ceil(count.
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