Question

Write a program to find all duplicates in a list.

Answer 1

a =[1,2,3,2,1,5,6,5,5,5]

d={ }

for elem in a:

if elem in

d: d[elem] + = 1

else:

d[elem] = 1

print elem

print [x for x, y in d.items() if y > 1],

print “have duplicates”

print d

Output screenshot:

[1,2,5] have duplicates

{1:2,2: 2,3:1,5:4, 6: 1}