AI Mobile CodersCoding Round Practice
Classic interview programs — every one solved for you in 8 languages. Pick a program, pick your language, learn the pattern.
PythonJavaScriptJavaKotlinSwiftDartC++C
Strings
25 programs| Palindrome String | Easy |
| Reverse a String | Easy |
| Count Vowels in a String | Easy |
| Check Two Strings are Anagram | Medium |
| Count Words in a Sentence | Easy |
| Balanced Parentheses | Hard |
| Toggle Case of a String | Easy |
| Count Occurrences of a Character | Easy |
| First Non-Repeating Character | Medium |
| Check Pangram | Medium |
| Remove Duplicate Characters | Medium |
| Longest Word in a Sentence | Medium |
| Capitalize Each Word | Easy |
| Check String Has Only Digits | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Longest Common Prefix | Medium |
| Roman to Integer | Medium |
| Reverse Words in a String | Medium |
| Valid Palindrome II | Medium |
| Isomorphic Strings | Medium |
| Longest Palindromic Substring | Medium |
| Format Phone Number | Easy |
| Truncate String with Ellipsis | Easy |
| Mask a String | Easy |
| Reverse Vowels of a String | Medium |
Numbers
23 programs| Factorial of a Number | Easy |
| Check Prime Number | Easy |
| Fibonacci Series | Easy |
| Armstrong Number | Medium |
| Sum of Digits | Easy |
| Swap Two Numbers | Easy |
| Even or Odd | Easy |
| FizzBuzz | Easy |
| Reverse a Number | Easy |
| GCD of Two Numbers | Medium |
| Sum of Natural Numbers | Easy |
| Count Digits in a Number | Easy |
| Palindrome Number | Easy |
| LCM of Two Numbers | Medium |
| Decimal to Binary | Medium |
| Perfect Number | Medium |
| Strong Number | Medium |
| Power of Two Check | Easy |
| Sum of Even Numbers | Easy |
| Count Primes | Medium |
| Add Thousands Separator | Easy |
| Bytes to Human Readable Size | Medium |
| Digital Root | Easy |
Arrays
24 programs| Largest Element in an Array | Easy |
| Reverse an Array | Easy |
| Second Largest Element in an Array | Medium |
| Find the Missing Number | Medium |
| Maximum Subarray Sum (Kadane's) | Hard |
| Sum of Array Elements | Easy |
| Count Even and Odd in Array | Easy |
| Rotate Array by K | Medium |
| Move Zeroes to End | Medium |
| Check if Array is Sorted | Easy |
| Merge Two Sorted Arrays | Medium |
| Two Sum | Medium |
| Majority Element | Medium |
| Product of Array Except Self | Medium |
| Container With Most Water | Medium |
| Single Number | Medium |
| Sort Colors | Medium |
| Trapping Rain Water | Hard |
| Best Time to Buy and Sell Stock | Medium |
| Merge Intervals | Medium |
| Subarray Sum Equals K | Medium |
| Find All Numbers Disappeared in an Array | Medium |
| First Missing Positive | Hard |
| Longest Consecutive Sequence | Medium |
Patterns
9 programs| Right-Angled Star Triangle | Easy |
| Inverted Star Triangle | Easy |
| Floyd's Triangle | Easy |
| Pyramid Star Pattern | Medium |
| Number Triangle | Easy |
| Right-Aligned Star Triangle | Easy |
| Diamond Star Pattern | Medium |
| Hollow Square Pattern | Medium |
| Pascal's Triangle | Medium |
Searching & Sorting
8 programs| Linear Search | Easy |
| Binary Search | Medium |
| Bubble Sort | Medium |
| Selection Sort | Medium |
| Kth Largest Element in an Array | Medium |
| Search in Rotated Sorted Array | Medium |
| Insertion Sort | Medium |
| Find Peak Element | Medium |
Loops
9 programs| Multiplication Table | Easy |
| Sum of First N Odd Numbers | Easy |
| Print Divisors of a Number | Easy |
| Sum of Squares | Easy |
| Collatz Sequence | Medium |
| Sum of Series 1 + 11 + 111 | Medium |
| Print Numbers Divisible by 3 or 5 | Easy |
| Print Prime Numbers up to N | Medium |
| Sum of Multiples of 3 or 5 | Easy |
Matrix
9 programs| Transpose of a Matrix | Medium |
| Rotate Matrix 90 Degrees | Hard |
| Set Matrix Zeroes | Medium |
| Spiral Matrix | Hard |
| Sum of Matrix Diagonals | Medium |
| Matrix Multiplication | Hard |
| Row-wise Maximum in Matrix | Easy |
| Count Zeros in a Matrix | Easy |
| Check Identity Matrix | Medium |
Recursion
10 programsDynamic Programming
11 programs| Coin Change | Medium |
| Word Break | Medium |
| House Robber | Medium |
| Longest Increasing Subsequence | Medium |
| Unique Paths | Medium |
| Edit Distance | Hard |
| Climbing Stairs | Easy |
| Decode Ways | Medium |
| Coin Change II | Medium |
| Longest Common Subsequence | Medium |
| Min Cost Climbing Stairs | Medium |
Real-World Scenarios
14 programs| LRU Cache | Medium |
| Pagination | Easy |
| Chunk an Array | Easy |
| Exponential Backoff Delays | Easy |
| Debounce Simulation | Medium |
| Rate Limiter (Fixed Window) | Medium |
| Parse Query String | Medium |
| Format Relative Time | Medium |
| Event Emitter | Medium |
| Throttle Simulation | Medium |
| Flatten a 2D Array | Easy |
| Run-Length Encoding | Medium |
| Snake Case to Camel Case | Easy |
| Slugify a String | Easy |