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• Practice Challenges
• First Reverse

For this challenge you will be reversing a string. 188684 solutions

• First Factorial

For this challenge you will be determining the factorial for a given number. 173198 solutions

• Longest Word

For this challenge you will be determining the largest word in a string. 116108 solutions

• Letter Changes

For this challenge you will be manipulating characters in a string based off their positions in the alphabet. 119331 solutions

For this challenge you will be adding up all the numbers from 1 to a certain argument. 96199 solutions

• Letter Capitalize

For this challenge you will be capitalizing certain characters in a string. 79543 solutions

• Simple Symbols

For this challenge you will be determining whether or not certain characters are in correct positions. 67400 solutions

• Check Nums

For this challenge you will be comparing two numbers and determining which one is greater. 68168 solutions

• Time Convert

For this challenge you will be determining the difference in hours and minutes between two given times. 53427 solutions

• Alphabet Soup

For this challenge you will be sorting characters in a string. 48650 solutions

• AB Check

For this challenge you will determine if two characters are separated a specific way in the string. 18630 solutions

• Vowel Count

For this challenge you will be counting all the vowels in a string. 17163 solutions

• Word Count

For this challenge you will be determining how many words a sentence contains. 16319 solutions

• Ex Oh

For this challenge you will traverse a string and determine if there is an equal amount of certain characters. 15894 solutions

• Palindrome

For this challenge you will determine if a string is written the same way forward and backwards. 19182 solutions

• Arith Geo

For this challenge you will determine if numbers within an array follow an arithmetic or geometric sequence. 14620 solutions

For this challenge you will determine if numbers in an array can add up to a certain number in the array. 9790 solutions

• Letter Count I

For this challenge you will determine which word has the greatest number of repeated letters. 8996 solutions

• Second GreatLow

For this challenge you will determine the second lowest and greatest numbers in an array. 14594 solutions

• Division Stringified

For this challenge you will divide two numbers and return them in a certain format. 10744 solutions

• Counting Minutes I

For this challenge you will return the total number of minutes between two times. 6399 solutions

• Mean Mode

For this challenge you will determine if the mode equals the mean in an array. 8391 solutions

• Dash Insert

For this challenge you will be manipulating a string using dashes (-). 9574 solutions

• Swap Case

For this challenge you will be swapping the case of each character in the string. 8755 solutions

For this challenge you will traverse a string searching for all the numbers and then you will add them up. 8730 solutions

• Third Greatest

For this challenge you will determine the third largest string within an array. 8541 solutions

• Powers of Two

For this challenge you will be determining whether or not a number is a power of two. 9033 solutions

For this challenge you will be determining the additive persistence for a given number. 6611 solutions

• Multiplicative Persistence

For this challenge you will be determining the multiplicative persistence for a given number. 5129 solutions

• Off Line Minimum

For this challenge you will be creating a subset of an array. 6893 solutions

• Changing Sequence

For this challenge you will determine when an array changes sequences. 3744 solutions

• Overlapping Ranges

For this practice test you will determine the intersection between two sets. 3144 solutions

• Superincreasing

For this challenge you will determine if each number is greater than the sum of all previous elements in an array. 3211 solutions

• Hamming Distance

For this challenge you will determine the difference between two strings. 2430 solutions

• Rectangle Area

For this challenge you will determine the area of a rectangle. 2904 solutions

• Bitwise One

For this challenge you will perform a bitwise operation on two binary numbers. 2163 solutions

• Other Products

For this challenge you will return the product of a set of elements in an array. 2246 solutions

• Wave Sorting

For this challenge you will determine if numbers in an array can be sorted in a particular way. 1727 solutions

• Array Matching

For this challenge you will add elements from two arrays in a particular order. 2584 solutions

• Binary Reversal

For this challenge you will be reversing a binary string. 1843 solutions

• Longest Increasing Sequence

For this challenge you will compute the length of the longest increasing subsequence. 3068 solutions

• Even Pairs

For this challenge you will determine if a pair of even numbers exists somewhere in a string. 1506 solutions

• Next Palindrome

For this challenge you will be determining the next largest palindrome. 1448 solutions

• Largest Pair

For this challenge you will determine the largest double digit number. 1907 solutions

• Nonrepeating Character

For this challenge you will find the first non-repeating character in a string. 3571 solutions

• Two Sum

For this challenge you will determine if two elements can sum to some larger number. 3343 solutions

• Bitwise Two

For this challenge you will perform a bitwise operation on two binary numbers. 1008 solutions

• Power Set Count

For this challenge you will determine the length of a power set. 1319 solutions

• Product Digits

For this challenge you will be determining the least amount of digits needed to produce a number. 1624 solutions

• Palindrome Creator

For this challenge you will be determining if you can create a palindrome from a list of numbers. 2338 solutions

• Basic Roman Numerals

For this challenge you will be converting a string of Roman numerals. 1138 solutions

• Food Distribution

For this challenge you will determine how to optimally distribute food to people. 1083 solutions

• Three Sum

For this challenge you will determine if three elements can sum to some larger number. 1326 solutions

• Correct Path

For this challenge you will be traversing a matrix searching for the correct path to take. 3875 solutions

• Scale Balancing

For this challenge you will be balancing a scale with weights on it. 5489 solutions

• Three Numbers

For this challenge you will be searching for a set of numbers in a string. 999 solutions

• Alphabet Searching

For this challenge you will determine if a set of characters exists in a string. 942 solutions

• Time Difference

For this challenge you will be searching for the smallest time difference. 868 solutions

• Triangle Row

For this challenge you will be adding up a whole row from Pascal's triangle. 503 solutions

• Vowel Square

For this challenge you will determine if a square of vowels exists in a matrix. 3426 solutions

• Closest Enemy

For this challenge you will search in an array for an enemy. 1803 solutions

• Closest Enemy II

For this challenge you will search in a matrix for an enemy. 3264 solutions

• Number Stream

For this challenge you will determine if a stream of digits occurs in a string. 1319 solutions

• Largest Four

For this challenge you will need to find the four largest elements in an array. 1497 solutions

• Distinct Characters

For this challenge you will determine if a string contains some number of distinct characters. 620 solutions

• Questions Marks

For this challenge you will be determining if a string follows a particular pattern. 9528 solutions

• Camel Case

For this challenge you will be converting a string into camel case format. 1919 solutions

• ASCII Conversion

For this challenge you will be replacing certain characters in a string. 516 solutions

• Simple Evens

For this challenge you will be checking whether a number is even. 701 solutions

• Snake Case

For this challenge you will be converting a string into snake case format. 1003 solutions

• Find Intersection

For this challenge you will be manipulating an array. 2772 solutions

• Sum Multiplier

For this challenge you will determine if two numbers can be multiplied to some specific number. 1819 solutions

• String Merge

For this challenge you will be merging two different strings together. 747 solutions

• One Decremented

For this challenge you will be counting how many times a specific pattern occurs in a large number. 701 solutions

• Element Merger

For this challenge you will be combining all of the elements in an array into a single number. 752 solutions

• GCF

For this challenge you will determine the greatest common factor of two numbers. 664 solutions

• Serial Number

For this challenge you will be determining if a string produces a valid serial number. 1044 solutions

• String Periods

For this challenge you will need to find the smallest repeating substring. 1319 solutions

• Palindrome Swapper

For this challenge you will determine if a palindrome can be created in a string. 620 solutions

• Remove Brackets

For this challenge you will determine how to create evenly matched brackets. 1651 solutions

• Command Line

For this challenge you will be parsing a command line string and counting its characters. 338 solutions

• Star Rating

For this challenge you will be calculating how to display a 5 star rating. 1659 solutions

• Moving Median

For this challenge you will calculate the median in an array within a sliding window. 1012 solutions

• Group Totals

For this challenge you will be adding values from key, value pairs. 1911 solutions

• String Changes

For this challenge you will manipulate a string based on two rules. 281 solutions

• FizzBuzz

For this challenge you will be solving the classic Fizz Buzz problem. 3111 solutions

• H Distance

For this challenge you will determine the difference between two strings. 432 solutions

• Different Cases

For this challenge you will be converting a string into camel case format. 328 solutions

• Equivalent Keypresses

For this challenge you will be manipulating an array. 485 solutions