inverted index

Question Leetcode 683: K Empty Slots There is a garden with N slots. In each slot, there is a flower. The N flowers will bloom one by one inN days. In each day, there will be exactly one flower blooming and it will be in the status of blooming since then. Given an array flowers consists of number from 1 to N. Each number in the array represents the place where the flower will open in that day.