Question

Write a program to find all duplicates in a list. [CBSE Text Book]

Answer 1

Answer:

Explanation:

def Repeat(x):  

   _size = len(x)  

   repeated = []  

   for i in range(_size):  

       k = i + 1

       for j in range(k, _size):  

           if x[i] == x[j] and x[i] not in repeated:  

               repeated.append(x[i])  

   return repeated  

 

list1 = [10, 20, 30, 20, 20, 30, 40,  

        50, -20, 60, 60, -20, -20]  

print (Repeat(list1))

Answer 2

The program in python language is as follows:

X = [ a , b , c , b , a , e , f , e , e , e ]

import collections         // It is a High-performance container datatype

print ( [ ele for ele , count in collections . Counter(X) . items( ) if count > 1 ] )

• In the above program, collection module is used which provides alternatives to general purpose built-in containers in Python i.e. dict, list, set, and tuple.

• The above program will print all the duplicates in the given list.