Day 22 of July LeetCode Challenge

3
/ \
9 20
/ \
15 7
[
[3],
[20,9],
[15,7]
]

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Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store