Arrays
Array-based problems
Medium
Spiral Traversal
Given a 2D matrix of numbers, return a spiral traversal of the matrix in the clockwise direction.
Easy
Product Sum
Given an array (that can have nested arrays) - return the sum of all the numbers in the array. If nested array is encountered, recursively add the num...
Easy
Non Repeating First Character
Given a string of characters, return the index of the first non-repeating character.
Medium
Maximum Subset Sum With No Adjacent
Given an array of POSITIVE INTEGERS, find the greatest sum that can be generated without adding 2 numbers positioned next to each other.
Easy
Multiple Filters
Given a list of products and a list of filters, create a multi-filters buttons bar with a list of filters. If any of the filter is clicked, the list o...
Easy
Form Validation
Create a Form Component in React that renders out a list of input fields and validates them before finally submitting the form. Create the form from s...
Easy
Nth Fibonacci
Given an integer n, return the nth Fibonacci number. In mathematics, the Fibonacci numbers form a sequence called the Fibonacci sequence - In which ea...
Medium
Number of Ways To Make Change
Given a target amount and a set of denominations (coins), find the total number of ways the given target amount can be expressed by using the denomina...
Easy
Smallest Difference
Given two arrays of integers, find the pair of values (one value in each array) with the smallest (non-negative) difference.
Easy
Move Element
Given an array of integers and a target value, move all instances of that target value to the end end of the array. The order of the resulting array d...
Medium
Levenshtein Distance
Given 2 strings, find the minimum number of operations required to change one string to the other. An operation is defined as either replacement of a ...
Medium
Minimum Number Of Coins To Make Change
Given an array of coins or denominations and a target sum, calculate the minimum number of coins required to match the total. Note that the coins arra...