Category
leetcode
Sum of Distances in Tree
Given an undirected tree, the problem is to find the sum of the distances between each pair of nodes in the tree, and return an array that contains the sum of distances between the node i and all other nodes, in the same order as the input 
Minimum Number of K Consecutive Bit Flips
Given an array of 0s and 1s and an integer k, the problem is to find the minimum number of times a k-length sequence of bits need to be flipped (i.e. 0s to 1s or 1s to 0s) in order to obtain an array of all 1s 
Kth Smallest Instructions
Find the minimum number of k-length bit flips to make an array of all 1s or kth smallest string of instructions to reach the bottom-right corner of a grid 
Substring With Largest Variance
Given a string and an integer k, the problem is to find the substring of length k that has the largest variance of character frequencies in it 
Split Message Based on Limit
Given a string and an integer limit, the problem is to split the given string into a list of strings such that the length of each string does not exceed the given limit and return the list