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1. Create a class Node
2. Create a HashMap<Integer, Node>
3. Linearly scan the array. For each num, if it doesn't exist in the array, create a Node and insert it.
4. If the num exists, then increase it's frequency.
5. After the scan is complete, return an array of Nodes from the HashMap.toArray()
6. Implement a comparator on Nodes -
7. Use Collections.sort on Node array and myComparator to sort them.
- dms January 25, 2017Total runtime O(nlogn) where n is the number of items in the original array.