Test
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# Time: O(a+b)
# Space: O(a)
def findCommon(arr1,arr2):
assert arr1 is not None and arr2 is not None, 'arrays are none'
assert len(arr1) >0 and len(arr2) >0, 'empty array'
foundMap = {}
for i in range(len(arr1)):
if arr1[i] not in foundMap:
foundMap[arr1[i]] = True
for j in range(len(arr2)):
if arr2[j] in foundMap:
return True
return False
arr1= ['a','c', 'f', 'l']
arr2= ['d','c', 'i', 'j']
arr3= []
print(findCommon(arr1,arr2))
Python
INFO