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Everything after it builds on dictionaries. Each rep in the check has to be passed without opening the solution. Hints and Basics are fine.

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Preview · where this ladder is heading

Merge Two Sorted Lists

You get the heads of two linked lists, each already in non-decreasing order. Combine them into one sorted list by relinking the existing nodes, and return the head of the combined list.

inl1 = 1 -> 3 -> 5, l2 = 2 -> 4out1 -> 2 -> 3 -> 4 -> 5
inl1 = empty, l2 = 0out0
inl1 = empty, l2 = emptyoutempty (None)

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