Top 50 Array Coding Problems for Interviews

Here is the collection of the Top 50 list of frequently asked interviews question on arrays. Problems in this Article is divided into three Levels so that readers can practice according to the difficulty level step by step. 

Level 1

1. Peak Element
2. Find the minimum and maximum element in an array
3. Write a program to reverse the array
4. Write a program to sort the given array
5. Find the Kth largest and Kth smallest number in an array
6. Find the occurrence of an integer in the array
7. Sort the array of 0s, 1s, and 2s
8. Subarray with given Sum
9. Move all the negative elements to one side of the array
10. Find the Union and Intersection of the two sorted arrays

Level 2

1. Write a program to cyclically rotate an array by one
2. Find the missing integer
3. Count Pairs with given sum
4. Find duplicates in an array
5. Sort an Array using the Quicksort algorithm
6. Find common elements in three sorted arrays
7. Find the first repeating element in an array of integers
8. Find the first non-repeating element in a given array of integers
9. Subarrays with equal 1s and 0s
10. Rearrange the array in alternating positive and negative items
11. Find if there is any subarray with a sum equal to zero
12. Find the Largest sum contiguous Subarray
13. Find the factorial of a large number
14. Find Maximum Product Subarray
15. Find the longest consecutive subsequence
16. Find the minimum element in a rotated and sorted array
17. Max sum in the configuration
18. Minimum Platforms
19. Minimize the maximum difference between the heights
20. Minimum number of jumps to reach the end
21. Stock Span problem
22. Find a triplet that sums to a given value
23. Smallest positive missing number
24. Find the row with a maximum number of 1’s
25. Print the matrix in a Spiral manner
26. Find whether an array is a subset of another array
27. Implement two Stacks in an array
28. Majority Element
29. Wave Array
30. Trapping Rainwater

Level 3

1. Maximum Index
2. Max sum path in two arrays
3. Find Missing And Repeating
4. Stock buy and sell Problem
5. Pair with the given sum in a sorted array
6. Chocolate Distribution Problem
7. Partition Equal Subset Sum
8. Smallest Positive integer that can’t be represented as a sum
9. Coin Change Problem
10. Longest Alternating subsequence

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