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#!/usr/bin/env python
from collections import Counter
def uniqueNumber(ints):
bag = Counter(ints) # count occurrences
keys = [
k # return just the keys
for k,v in bag.items() # get key/value pairs
if v == 1 # keys that occur once
]
# invalid input
if len(keys) == 0:
return 'no element appears only once'
if len(keys) > 1:
return 'multiple elements appear only once'
# return the one value
return keys.pop(0)
def comma_join(arr):
return ', '.join(map(lambda i: str(i), arr))
def solution(ints):
print(f'Input: @ints = ({comma_join(ints)})')
print(f'Output: {uniqueNumber(ints)}')
print('Example 1:')
solution([3, 3, 1])
print('\nExample 2:')
solution([3, 2, 4, 2, 4])
print('\nExample 3:')
solution([1])
print('\nExample 4:')
solution([4, 3, 1, 1, 1, 4])
print('\nInvalid Input 1 (no element appears only once):')
solution([4, 1, 1, 1, 4])
print('\nInvalid Input 2 (multiple elements appear only once):')
solution([1, 2, 3, 4])
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