Given a list of non-negative integers nums, arrange them such that they form the largest number and return it.
nums
Since the result may be very large, so you need to return a string instead of an integer.
Given an m x n integers matrix, return the length of the longest increasing path in…
m x n
matrix
Given the root of a binary tree, check whether it is a mirror of itself (i.e., symmetric around its center).
root