Basic Array Problems

Find the largest element in an array

Find the second largest element in array

Check if array is sorted in ascending order

Reverse the elements of an array

Remove duplicates from a sorted array

Move all zeros to the end while maintaining order

Rotate an array by K positions

Find the missing number in array from 1 to N

Count frequency of each element in array

Find if there exists a pair with given sum

Check if an array is subset of another array

Find union of two arrays

Find intersection of two arrays

Find all duplicate elements in array

Find the first repeating element in array

Find the first non-repeating element

Print alternate elements of an array

Find sum of all array elements

Find average of stream of numbers

Find index of a given element

Find elements where value equals its index

Count elements smaller and larger than X

Find elements with at least two greater elements

Compare skills of two persons

Perform operations on array elements

Check if all array elements are palindrome

Check if array is perfect (reverse equals original)

Check if array can be balanced

Check if number is fascinating

Find product of all array elements

Rotate array by one position clockwise

Count odd and even elements in array

Find minimum and maximum element in array

Segregate 0s and 1s in array

Sort an array containing only 0s, 1s and 2s

Sort binary array in-place

Move all negative elements to one side

Find kth smallest element in array

Find kth largest element in array

Find a peak element in array

Find point where 0s transition to 1s

Find first and last occurrences of x in sorted array

Count occurrences of a number in sorted array

Find element that appears more than n/2 times

Find elements appearing more than n/k times

Find element appearing once when others appear twice

Search an element in rotated sorted array

Count pairs of elements with given sum

Find common elements in three sorted arrays

Rearrange array with max at first position, min at second

Count pairs where x^y > y^x

Count inversions in array

Find all elements greater than all elements to their right

Find equilibrium point where left sum equals right sum

Sort array in wave form

Check if array has Pythagorean triplet

Minimize difference between maximum and minimum chocolates

Find maximum profit by buying and selling stocks

Find element with all left side smaller and right side greater

Convert array to zig-zag fashion