题目描述：
LeetCode 341. Flatten Nested List Iterator
Given a nested list of integers, implement an iterator to flatten it.
Each element is either an integer, or a list -- whose elements may also be integers or other lists.
Example 1:
Given ...
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[LeetCode]Flatten Nested List Iterator
[LeetCode]Counting Bits
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LeetCode.
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Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation and return them as an array.
Example ...
[LeetCode]House Robber III
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LeetCode.
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LeetCode 337. House Robber III
The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the "root." Besides the root, each house has one and only one parent ...
[LeetCode]Palindrome Pairs
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LeetCode.
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LeetCode 336. Palindrome Pairs
Given a list of unique words. Find all pairs of indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome.
Example ...
[LeetCode]Self Crossing
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You are given an array x of n positive numbers. You start at point (0,0) and moves x[0] metres to the north, then x[1] metres to the west, x[2] metres to ...