JAVA, If an array has a lot of repeated values, it is possibleto optimize quicksort to run significantly faster. The key idea isto partition the array into three regions instead of 2; thus we’llcall this quicksort3way. The left-most region has all the valuessmaller than the partition value, the right-most region has all thevalues greater than the partition value, and the middle has all theentries larger than the partition value.
I’m requiring you to use half-open ranges rather thanthe (IMO) off-by-one prone code that Sedgewick and Wayneuse.
We’ll use p = a[lo] as the partition value. Here is what thearray looks like during
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