Must Do Arrays Top 50 Coding Problems

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

Easy level:

Find a peak element which is not smaller than its neighbors

Find the minimum and maximum element in an array

Write a program to reverse the array

Write a program to sort the given array

Find the Kth largest and Kth smallest number in an array

Find the occurrence of an integer in the array

Sort the array of 0s, 1s, and 2s

Subarray with given Sum

Move all the negative elements to one side of the array

Find the Union and Intersection of the two sorted arrays

Medium level:

Write a program to cyclically rotate an array by one

Find the missing integer

Count Pairs with the given sum

Find duplicates in an array

Sort an Array using the Quicksort algorithm

Find common elements in three sorted arrays

Find the first repeating element in an array of integers

Find the first non-repeating element in a given array of integers

Subarrays with equal 1s and Os Rearrange the array in alternating_positive and negative items

Find if there is any subarray with a sum equal to zero

Find the Largest sum contiguous Subarray

Find the factorial of a large number

Find Maximum Product Subarray.

Find the longest consecutive subsequence

Find the minimum element in a rotated and sorted array

Max sum in the configuration

Minimum Platforms

Minimize the maximum difference between the heights

Minimum number of jumps to reach the end Stock Span problem

Find a triplet that sums to a given value

Smallest positive missing number

Find the row with a maximum number of 1's

Print the matrix in a Spiral manner

Find whether an array is a subset of another array

Implement two Stacks in an array

Majority Element

Wave Array

Trapping Rainwater

Hard level:

Maximum Index

Max sum path in two arrays

Find Missing And Repeating

Stock buy and sell Problem

Pair with the given sum in a sorted array

Chocolate Distribution Problem

Partition Equal Subset Sum

Smallest Positive integer that can't be represented as a sum

Coin Change Problem

Longest Alternating subsequence