[Solved] Given head, the head of a linked list, determine if the linked list has a cycle in it.
[Solved] Given an integer array nums where every element appears three times except for one, which appears exactly once. Find the single element and return it. You must implement a solution with a linear runtime complexity and use only constant extra space.
[Solved] Given a non-empty array of integers nums, every element appears twice except for one. Find that single one. You must implement a solution with a linear runtime complexity and use only constant extra space.
[Solved] You are given the root of a binary tree containing digits from 0 to 9 only. Each root-to-leaf path in the tree represents a number.
[Solved] Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence.
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