12/7的HiringEvent,
面的AD组. 12/10给congrats
letter给的应该是SDEII
1: Find target Path sum from
root to lea, recursion and non-recursion(followup)
2: BSTsuccessor: non-recursion,
follow up: Next Bigger than self in an array
3: Given a dictionary of Strings and
find if the given string sentence can be composed by the words in dictionary, talk
about corner cases
4: Check if two rectangles intersect
with each other, design the class yourself
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