How to Partition an Array Into Three Parts With Equal Sum?
Given an array A of integers, return true if and only if we can partition the array into three non-empty parts with equal sums. Formally, we can partition the …
Compute the Sum of Even Numbers After Queries
We have an array A of integers, and an array queries of queries. For the i-th query val = queries, index = queries, we add val to A. Then, …
How to Compute Nested List Weight Sum of Any Arrays?
Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list — …
How to Delete Columns to Make Sorted Table?
We are given an array A of N lowercase letter strings, all of the same length. Now, we may choose any set of deletion indices, and for each string, …
How to Check If a Integer is a Strobogrammatic Number?
A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function to determine if a number is strobogrammatic. The …
How to Find Pivot Index of Array?
Given an array of integers nums, write a method that returns the “pivot” index of this array. We define the pivot index as the index where the sum of …