Challenges Contests Community
Tools
CLI Scripts New Snippet

Challenges

Welcome to Knowledge Center challenges, a place to test out your skills in one of 17 languages of your choosing on a number of different practical tests. Points are awarded based on difficulty. You can complete the challenge up to 17 times (one for each available language). New challenges are being added all the time.

Easy (+10 pts)
Unsolved Reverse a string
Just take any given string and output it in reverse, pretty easy, right?
Unsolved Count number frequency
Take a string of numbers and output the one which appears the most.
Unsolved Sum a list of numbers
Take a string of comma separated numbers and print out the sum.
Unsolved Integer list sorting
Take a list of integers and print it after sorting it in descending order.
Unsolved Find Longest Word
Given a string with multiple words, return the longest word.
Unsolved Find The Cookie
Given a binary string, a cookie, find its place in the binary cookie jar.
Unsolved Spiral Sum
Given the size of a spiral, calcuale the sum of the four corners.
Medium (+30 pts)
Unsolved Convert string to binary
Take three lowercase letters and print out binary.
Unsolved Fibonacci Numbers
Start with one Fibonacci sequence number, then calculate more from there.
Unsolved Check scrambled string
Given two strings of equal length, figure out if one is a scramble of the other.
Unsolved Zipper merge
Merge two arrays in a zipper-like fashion.
Unsolved Find Most Common Characters
Given a string with multiple words, find the most common character.
Unsolved Digit Sum Even or Odd
Given a number, find out if the sum of the digits is even or odd.
Unsolved File Names
Rename the files such that no two files have the same name.
Unsolved Recursive Sum
Given a whole number, print it’s recursive sum.
Unsolved How long ago?
Given two dates, return the difference between the two.
Hard (+50 pts)
Unsolved Detect and fix invalid JSON
Take an invalid JSON string and figure out where the errors are and make it valid.
Unsolved Roman Numeral conversion
Take a roman numeral(<1000 in value) and print its corresponding value in the decimal system of numbers.
Unsolved Pig latin translator
Take a sentence/phrase in pig latin, translate it to English.
Unsolved Answer The Quadratic
Given a quadratic find the decimal values of x
Privacy Policy