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Problems

Flatten List

Problem

Given a list, each element in the list can be a list or integer. flatten it into a simply list with integers.

If the element in the given list is a list, it can contain list too.

Example

Given [1,2,[1,2]], return [1,2,1,2].

Given [4,[3,[2,[1]]]], return [4,3,2,1].

Online Judge