replaced http://codereview.stackexchange.com/ with https://codereview.stackexchange.com/
Question 1 : Missing level of technical depth (Recursive to Iterative)
Question 2 : Missing level of technical depth (Flatten Tree)
Question 1 : Missing level of technical depth (Recursive to Iterative)
Question 2 : Missing level of technical depth (Flatten Tree)
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lang-java