Week4 (Apr 8)

78. Subsets

Question

Given an integer array

$nums$ of unique elements, return all possible subsets (the power set).

The solution set must not contain duplicate subsets. Return the solution in any order.

Hand in homework before Saturday.

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430. Flatten a Multilevel Doubly Linked List

Question

You are given a doubly linked list, which contains nodes that have a next pointer, a previous pointer, and an additional child pointer. This child pointer may or may not point to a separate doubly linked list, also containing these special nodes. These child lists may have one or more children of their own, and so on, to produce a multilevel data structure as shown in the example below.

Given the

$head$ of the first level of the list, flatten the list so that all the nodes appear in a single-level, doubly linked list. Let

$curr$ be a node with a child list. The nodes in the child list should appear after

$curr$ and before

$curr.next$ in the flattened list.

Return the

$head$ of the flattened list. The nodes in the list must have all of their child pointers set to

$null$.

Hand in homework before Saturday.

Woody的作業
Roger的作業
Allen的作業
xander的作業
…Continue filling by yourself