| Join Two Strings | strings | 97% | Easiest |
| Add Two Numbers | integers | 99% | Easiest |
| Integers From the End of Array | integers arrays | 89% | Easiest |
| Integer Equal to It's Index | integers arrays | 96% | Easiest |
| Return String at Character | strings | 95% | Easiest |
| Remove Letters from Special Characters | arrays strings | 96% | Easiest |
| Largest Integer in Array | integers arrays | 99% | Easiest |
| Joining Characters in an Array | strings arrays | 99% | Easiest |
| Find the Number of 1's in a 2D Array | integers arrays | 94% | Easiest |
| Splitting Strings | strings arrays | 87% | Easiest |
| Duplicating Strings | strings arrays | 100% | Easiest |
| Kth Integer From End of Array | integers arrays | 100% | Easiest |
| Remove First Integer in Array | integers arrays | 100% | Easiest |
| Prefix of a String | strings | 99% | Easiest |
| Multiples of Integers | arrays integers | 99% | Easiest |
| Remove all Zeros from Array | integers arrays | 98% | Easiest |
| Sum an Array of Integers | arrays numbers | 99% | Easiest |
| Alternate Between Upper and Lower Case Characters | strings arrays | 99% | Easiest |
| Remove the First Element in Array | strings arrays | 100% | Easiest |
| Find Last Occurrence of Integer in Array | integers arrays | 99% | Easiest |
| Find Sequence of Integers in Another Array | integers arrays | 95% | Easiest |
| Find Identical Characters in a Row | strings | 100% | Easiest |
| Movement on an X-Y Plane with 2D Arrays | integers arrays | 100% | Easiest |
| Find String in Array of Strings | strings arrays | 100% | Easiest |
| Reversing an Array of Integers | integers arrays | 100% | Easiest |
| Movement of a Person Given an Array | integers strings arrays | 100% | Easiest |
| Check if a String is a Palindrome | strings | 100% | Easiest |
| Products of Integers in Array | integers arrays | 98% | Easiest |
| Reverse List of Strings | strings arrays | 100% | Easiest |
| Integers in Range of X,Y | integers arrays | 100% | Easy |
| Find Integer in Array | integers arrays | 100% | Easy |
| Sum of Strings | arrays strings | 99% | Easy |
| Arrays of Integers | arrays integers | 94% | Easy |
| Pairs of Integers | integers arrays | 93% | Easy |
| Create a Multiplication Table | integers arrays | 98% | Easy |
| Intersection of an Array | integers arrays | 100% | Easy |
| Merging Sorted Array of Integers | arrays integers | 98% | Easy |
| Character Appears Even Number of Times | strings | 95% | Easy |
| Array of Strings Without Special Characters | strings arrays | 91% | Easy |
| Find the Most Frequently Occurring Character | strings integers | 80% | Easy |
| Strings of Anagrams | arrays strings | 90% | Easy |
| Sum Each Digit of an Integer | integers | 100% | Easy |
| Reverse Characters in a String | strings | 90% | Easy |
| Find the First Duplicate | arrays integers | 87% | Easy |
| Remove Duplicated Strings | arrays strings | 98% | Easy |
| Find the Missing Number | integers arrays | 89% | Easy |
| 2D Array of Integers With Square Root Dimensions | integers arrays | 100% | Easy |
| Find the Largest Sum | arrays integers | 88% | Easy |
| Right Side Equal to the Left | integers arrays | 92% | Easy |
| Find the Character That Doesn't Belong | strings | 93% | Easy |
| Quantity of Numbers Between | integers | 68% | Easy |
| Find Closest Point in Array | integers arrays | 82% | Easy |
| Find the Median of an Array | arrays integers | 52% | Easy |
| Find the Next Time Formed by String | strings | 33% | Easy |
| Reverse Words in a Sentence | strings | 96% | Easy |
| Find Two Duplicate Strings | strings arrays | 83% | Easy |
| Find Common Integers | arrays integers | 95% | Easy |
| Palindromic Numbers | integers | 100% | Easy |
| Move Zeroes to the End | integers arrays | 100% | Easy |
| Array of Strings From a Pattern | strings arrays | 100% | Easy |
| Array as a Single Integer | integers arrays | 100% | Easy |
| Add Arrays Like Single Numbers | integers arrays | 100% | Easy |
| Largest Integer in Array, Smaller Than K | integers arrays | 95% | Easy |
| Return a Rectangle as a 2D array | integers arrays | 60% | Easy |
| Greatest Difference Between Two Integers | integers arrays | 100% | Easy |
| Sort an Array of Strings | strings arrays | 77% | Easy |
| Anagrams | strings | 95% | Easy |
| Strings as Operators | strings arrays | 38% | Easy |
| Matching Digits from Two Integers | integers arrays | 93% | Easy |
| Swap Upper and Lower Case Characters in a String | strings | 94% | Easy |
| Camel Case and Clean a String | strings | 79% | Easy |
| Find Overlapping Rectangles | integers arrays | 80% | Easy |
| Find the Column Number of a Spreadsheet | strings integers | 83% | Easy |
| Merge 2D Array into Single Array | integers arrays | 100% | Easy |
| Find the K Middle Integers Between Two Integers | integers | 100% | Easy |
| Find the First Exact Match in an Array of Strings | strings arrays | 100% | Easy |
| Return Array with all Palindromes Found in String | strings arrays | 50% | Easy |
| Check if Two Strings With Special Characters are Anagrams | strings | 100% | Easy |
| Largest Integer in Array Within Range of Arguments | integers arrays | 100% | Easy |
| Find the Smallest Whole Number Not in Array | integers arrays | 86% | Easy |
| Find String in Array That is Repeated an Odd Number of Times | strings arrays | 100% | Easy |
| Find the Non-duplicated String | strings arrays | 100% | Easy |
| Create a New Array of Every Kth Largest Element | integers arrays | 100% | Easy |
| Splitting Integers into 2D Array | arrays integers | 100% | Easy |
| Adding Rows of a 2D Array | arrays integers | 89% | Easy |
| Prime Numbers Less Than Argument | integers arrays | 100% | Easy |
| Password Complexity Checker | strings | 82% | Easy |
| Convert 2D Array to a 1D Array | integers arrays | 90% | Easy |
| Cards of the Same Suit | strings arrays | 100% | Easy |
| Replacing Characters with other Characters | strings | 92% | Easy |
| Add Minutes to String Representing Time | integers strings | 89% | Easy |
| Swap Sequential Pairs of Integers | strings arrays | 100% | Easy |
| String to Array of Strings | strings arrays | 75% | Easy |
| Interval in an Array of Intervals | arrays integers | 94% | Medium |
| Longest Common Prefix | arrays strings | 66% | Medium |
| Sequence That Returns Largest Sum | arrays integers | 25% | Medium |
| Binary Insertion Sort of Integers | integers arrays sorting | 100% | Medium |
| Sum and Sort List of Integers | arrays integers sorting | 93% | Medium |
| Sort a List of Timestamps | strings arrays sorting | 91% | Medium |
| Additional Characters Needed to Make up a String | strings arrays | 93% | Medium |
| Largest Common Integer | integers arrays | 86% | Medium |
| Longest Increasing Sequence | integers arrays | 100% | Medium |
| Find a Column in 2D Array of All Ones | integers arrays | 90% | Medium |
| Merging Arrays of Integers in 2D Array | arrays integers | 92% | Medium |
| Pascal's Triangle | arrays sorting | 100% | Medium |
| Closest Points in 2D Array | arrays integers | 60% | Medium |
| Smallest Interval in 2D Array | integers arrays | 86% | Medium |
| Two Elements Add Up to Argument | integers arrays | 100% | Medium |
| Balanced Parenthesis | strings | 100% | Medium |
| Find Equal Integer Pairs in an Array | integers arrays | 88% | Medium |
| Merging Two Sorted Arrays of Strings | strings arrays | 91% | Medium |
| Remove Duplicates from a 2D Array | strings arrays | 100% | Medium |
| Sort Values of Array Based on Squares | integers arrays | 100% | Medium |
| Anagrams in a List of Strings | strings arrays | 92% | Medium |
| Balancing Parenthesis | strings | 100% | Medium |
| Smaller Number With All the Same Integers | integers | 67% | Medium |
| Merge and Sort Two Arrays of Integers | integers arrays | 100% | Medium |
| Merge Overlapping Intervals | arrays integers | 50% | Medium |
| Intervals Without Overlaps | arrays integers | 75% | Medium |
| Sort Strings in 24 Hour Clock Format | strings arrays | 100% | Medium |
| Sorting Points in a 2D Array by Distance from Origin | arrays integers | 100% | Medium |
| Rotate a 2D Array Matrix by 90 Degrees | integers arrays | 83% | Medium |
| Sorting a 2D Array Without Changing Inner Array Length | integers arrays | 100% | Medium |
| Return New Directory Path of a Change Command | strings | 100% | Medium |
| Largest Sum of Two Non-Adjacent Elements | integers arrays | 75% | Medium |
| Change Strings in 2D Array Based on Conditions | strings arrays | 100% | Medium |
| Cycle in an Array | arrays integers | 63% | Medium |
| Sum of Traversed Integers in a 2D Array | integers arrays | 50% | Medium |
| Number of Hours it Takes a Worker to Finish Job | integers arrays | 80% | Medium |
| Longest Palindrome | strings | 80% | Hard |
| Liquid in a Soda Machine | integers arrays | 50% | Hard |
| Non-overlapping Intervals | arrays integers | 100% | Hard |
| Combinations of Integers | integers arrays | 50% | Hard |
| Sum of Continuous Subarray | arrays integers | 100% | Hard |
| Find the Largest Prime Number | arrays integers | 33% | Hard |
| Matching Strings | strings | 86% | Hard |
| Adding Lists of Integers | integers arrays | 80% | Hard |
| Number of Sums of a Subset | integers | 50% | Hard |
| Identical Strings from Swapping Characters | strings arrays | 100% | Hard |
| Points in a Straight Line | arrays integers | 100% | Hard |
| Closest Sum in an Array | arrays integers | 25% | Hard |
| Decoding a Cipher | cryptography integers arrays | 50% | Hard |
| Evaluating Expressions in Strings | strings integers | 100% | Hard |
| Traversing a Path in a 2D Array | integers arrays | 0% | Hard |
| Shortest Substring | arrays strings | 67% | Hard |
| Boxes and Walls in a 2D Array | strings arrays | 0% | Hard |
| Polynomial Equations | integers strings | 0% | Hard |
| Form a String from Array of Characters | strings arrays | 100% | Hard |
| Find Integer Pair in Array with K elements Between | integers arrays | 75% | Hard |
| Multiplying and Adding Rows of 2D and 1D Arrays | integers arrays | 100% | Hard |
| Largest Sum of Non-Adjacent Elements | integers arrays | 100% | Hard |
| Find the Number of Continents in a 2D Array | integers arrays | 100% | Hard |
| Sorting Strings Inside Strings | strings sorting | 67% | Hardest |
| Largest K by K Group in 2D Array | arrays integers | 100% | Hardest |
| Find String in 2D Array of Strings | strings arrays | 89% | Hardest |
| Find Dividend Without Using Division Operator | integers | 86% | Hardest |
| Rectangle in a 2D Array | arrays integers | 25% | Hardest |