Recursion lessons
Node 22.08.0
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Test casesRun to compare output
Input
ops = ["BSTIterator","next","next","hasNext","next","hasNext","next","hasNext","next","hasNext"], args = [[[7,3,15,null,null,9,20]],[],[],[],[],[],[],[],[],[]]
Output
—
Expected
[null,3,7,true,9,true,15,true,20,false]
More practice
Same technique, different problems. Try them without the walkthrough.