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If you add underscores to root, why not to all elements?
Isn't the my shown diagram show uniformness according to your design? You just broadened the root, if you broaden the root, you will also have to broaden others equally. So its answer will be 4,2,1,3,7
if you only have same space everywhere how can you add left child of 3, so really parents have twice width of branch then children so all the nodes can be set.
i have the same question .This case will definitely leads to failure of our logic