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djwashburn/return_duplicates.py

Created December 24, 2016 18:43
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return_duplicates.py
def return_duplicates(arr):
set = {}
for x in arr:
if x in set:
set[x] = 2
else:
set[x] = 1
ret = []
for y in set.keys():
if set[y] == 2:
ret.append(y)
return ret
print rem_dup([3,5,9,6,8,4,6,8,4,6,7,9,1,6,9,1])
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