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Course Material

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• Practice Challenges
• First Reverse

For this challenge you will be reversing a string. 194540 solutions

• First Factorial

For this challenge you will be determining the factorial for a given number. 178415 solutions

• Longest Word

For this challenge you will be determining the largest word in a string. 119605 solutions

• Letter Changes

For this challenge you will be manipulating characters in a string based off their positions in the alphabet. 123288 solutions

For this challenge you will be adding up all the numbers from 1 to a certain argument. 97069 solutions

• Letter Capitalize

For this challenge you will be capitalizing certain characters in a string. 80459 solutions

• Simple Symbols

For this challenge you will be determining whether or not certain characters are in correct positions. 67627 solutions

• Check Nums

For this challenge you will be comparing two numbers and determining which one is greater. 68610 solutions

• Time Convert

For this challenge you will be determining the difference in hours and minutes between two given times. 54351 solutions

• Alphabet Soup

For this challenge you will be sorting characters in a string. 49700 solutions

• AB Check

For this challenge you will determine if two characters are separated a specific way in the string. 18952 solutions

• Vowel Count

For this challenge you will be counting all the vowels in a string. 17680 solutions

• Word Count

For this challenge you will be determining how many words a sentence contains. 16644 solutions

• Ex Oh

For this challenge you will traverse a string and determine if there is an equal amount of certain characters. 16307 solutions

• Palindrome

For this challenge you will determine if a string is written the same way forward and backwards. 20052 solutions

• Arith Geo

For this challenge you will determine if numbers within an array follow an arithmetic or geometric sequence. 14841 solutions

For this challenge you will determine if numbers in an array can add up to a certain number in the array. 10300 solutions

• Letter Count I

For this challenge you will determine which word has the greatest number of repeated letters. 9184 solutions

• Second GreatLow

For this challenge you will determine the second lowest and greatest numbers in an array. 14945 solutions

• Division Stringified

For this challenge you will divide two numbers and return them in a certain format. 10928 solutions

• Counting Minutes I

For this challenge you will return the total number of minutes between two times. 6509 solutions

• Mean Mode

For this challenge you will determine if the mode equals the mean in an array. 8483 solutions

• Dash Insert

For this challenge you will be manipulating a string using dashes (-). 9782 solutions

• Swap Case

For this challenge you will be swapping the case of each character in the string. 8920 solutions

For this challenge you will traverse a string searching for all the numbers and then you will add them up. 8906 solutions

• Third Greatest

For this challenge you will determine the third largest string within an array. 8669 solutions

• Powers of Two

For this challenge you will be determining whether or not a number is a power of two. 9164 solutions

For this challenge you will be determining the additive persistence for a given number. 6706 solutions

• Multiplicative Persistence

For this challenge you will be determining the multiplicative persistence for a given number. 5311 solutions

• Off Line Minimum

For this challenge you will be creating a subset of an array. 7065 solutions

• Changing Sequence

For this challenge you will determine when an array changes sequences. 4072 solutions

• Overlapping Ranges

For this practice test you will determine the intersection between two sets. 3374 solutions

• Superincreasing

For this challenge you will determine if each number is greater than the sum of all previous elements in an array. 3360 solutions

• Hamming Distance

For this challenge you will determine the difference between two strings. 2608 solutions

• Rectangle Area

For this challenge you will determine the area of a rectangle. 3045 solutions

• Bitwise One

For this challenge you will perform a bitwise operation on two binary numbers. 2342 solutions

• Other Products

For this challenge you will return the product of a set of elements in an array. 2374 solutions

• Wave Sorting

For this challenge you will determine if numbers in an array can be sorted in a particular way. 1812 solutions

• Array Matching

For this challenge you will add elements from two arrays in a particular order. 2716 solutions

• Binary Reversal

For this challenge you will be reversing a binary string. 3797 solutions

• Longest Increasing Sequence

For this challenge you will compute the length of the longest increasing subsequence. 3661 solutions

• Even Pairs

For this challenge you will determine if a pair of even numbers exists somewhere in a string. 1588 solutions

• Next Palindrome

For this challenge you will be determining the next largest palindrome. 1541 solutions

• Largest Pair

For this challenge you will determine the largest double digit number. 2020 solutions

• Nonrepeating Character

For this challenge you will find the first non-repeating character in a string. 5244 solutions

• Two Sum

For this challenge you will determine if two elements can sum to some larger number. 3753 solutions

• Bitwise Two

For this challenge you will perform a bitwise operation on two binary numbers. 1048 solutions

• Power Set Count

For this challenge you will determine the length of a power set. 1375 solutions

• Product Digits

For this challenge you will be determining the least amount of digits needed to produce a number. 1676 solutions

• Palindrome Creator

For this challenge you will be determining if you can create a palindrome from a list of numbers. 2943 solutions

• Basic Roman Numerals

For this challenge you will be converting a string of Roman numerals. 1206 solutions

• Food Distribution

For this challenge you will determine how to optimally distribute food to people. 1171 solutions

• Three Sum

For this challenge you will determine if three elements can sum to some larger number. 1464 solutions

• Correct Path

For this challenge you will be traversing a matrix searching for the correct path to take. 3937 solutions

• Scale Balancing

For this challenge you will be balancing a scale with weights on it. 5633 solutions

• Three Numbers

For this challenge you will be searching for a set of numbers in a string. 1119 solutions

• Alphabet Searching

For this challenge you will determine if a set of characters exists in a string. 1075 solutions

• Time Difference

For this challenge you will be searching for the smallest time difference. 1246 solutions

• Triangle Row

For this challenge you will be adding up a whole row from Pascal's triangle. 527 solutions

• Vowel Square

For this challenge you will determine if a square of vowels exists in a matrix. 3462 solutions

• Closest Enemy

For this challenge you will search in an array for an enemy. 2012 solutions

• Closest Enemy II

For this challenge you will search in a matrix for an enemy. 3304 solutions

• Number Stream

For this challenge you will determine if a stream of digits occurs in a string. 1804 solutions

• Largest Four

For this challenge you will need to find the four largest elements in an array. 1929 solutions

• Distinct Characters

For this challenge you will determine if a string contains some number of distinct characters. 737 solutions

• Questions Marks

For this challenge you will be determining if a string follows a particular pattern. 13702 solutions

• Camel Case

For this challenge you will be converting a string into camel case format. 2399 solutions

• ASCII Conversion

For this challenge you will be replacing certain characters in a string. 653 solutions

• Simple Evens

For this challenge you will be checking whether a number is even. 825 solutions

• Snake Case

For this challenge you will be converting a string into snake case format. 1503 solutions

• Find Intersection

For this challenge you will be manipulating an array. 8498 solutions

• Sum Multiplier

For this challenge you will determine if two numbers can be multiplied to some specific number. 2785 solutions

• String Merge

For this challenge you will be merging two different strings together. 830 solutions

• One Decremented

For this challenge you will be counting how many times a specific pattern occurs in a large number. 834 solutions

• Element Merger

For this challenge you will be combining all of the elements in an array into a single number. 828 solutions

• GCF

For this challenge you will determine the greatest common factor of two numbers. 768 solutions

• Serial Number

For this challenge you will be determining if a string produces a valid serial number. 1275 solutions

• String Periods

For this challenge you will need to find the smallest repeating substring. 2025 solutions

• Palindrome Swapper

For this challenge you will determine if a palindrome can be created in a string. 703 solutions

• Remove Brackets

For this challenge you will determine how to create evenly matched brackets. 2650 solutions

• Command Line

For this challenge you will be parsing a command line string and counting its characters. 438 solutions

• Star Rating

For this challenge you will be calculating how to display a 5 star rating. 2216 solutions

• Moving Median

For this challenge you will calculate the median in an array within a sliding window. 1261 solutions

• Group Totals

For this challenge you will be adding values from key, value pairs. 2430 solutions

• String Changes

For this challenge you will manipulate a string based on two rules. 411 solutions

• FizzBuzz

For this challenge you will be solving the classic Fizz Buzz problem. 3857 solutions

• H Distance

For this challenge you will determine the difference between two strings. 578 solutions

• Different Cases

For this challenge you will be converting a string into camel case format. 399 solutions

• Equivalent Keypresses

For this challenge you will be manipulating an array. 662 solutions