Arrays are one of the most fundamental and widely used data structures in programming. These questions test your ability to apply various techniques such as hashing, sorting, binary search, two pointers, sliding window, divide and conquer, dynamic programming, etc.
| Array Questions | Practice Link | Code Solutions | Video Solutions | HINT |
|---|---|---|---|---|
| Wave Array | ||||
| Subarray with given sum | ||||
| Missing number in array | ||||
| Rotate Array | Solve | CODE | Video | |
| Find duplicates in an array | ||||
| Remove all occurrences of Given Number | Solve | |||
| Remove Duplicates from Sorted Array | Solve | |||
| Move all zeroes to end of array | ||||
| Sort an array of 0s, 1s and 2s | Solve , Solve | Code | Video | |
| Intersection of two arrays | ||||
| Reverse an array | ||||
| Swapping Elements in an array | ||||
| Find Min and Max in an Array |
| Array Questions | Practice Link | Code Solutions | Video Solutions | HINT |
|---|---|---|---|---|
| Valid Moutain Array | Solve | Code | Video | 2 pointers |
| Majority Element | Solve | Code | Video | Sorting / or Boyer-Moore Voting Algorithm |
| Kth largest/smallest element in an array | Solve | Code | Video | soritng / priority q |
| Trapping Rain Water | ||||
| Coin Change | ||||
| Stock span problem | ||||
| Merge k Sorted Arrays | ||||
| Next Permutation | Solve | Code | Video | 2 poniters |
| Kadane's Algorithm |
| Array Questions | Practice Link | Code Solutions | Video Solutions | HINT |
|---|---|---|---|---|
| Merge Without Extra Space | ||||
| Next Smallest Palindrome |