Frequency of elements in array
Removing duplicates in array
Finding doublet (or) duplicates
Finding triplets or 'n' lets
count of each element in array
two for loops we have to use
first for loop for selecting the element
second for loop for compare the selected
element with the rest of the array.
case:
Input: 5 // size of array
1 2 3 1 2
output: frequency of 1 is 2
frequency of 2 is 2
frequency of 3 is 1