Practice Note

Read input

Read a list of input

Ref: https://stackoverflow.com/questions/15963959/reading-a-line-of-integers-in-python

in python3:

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numbers = list(map(int, input().split()))

Counter

collections.Counter()

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>>> from collections import Counter
>>> 
>>> myList = [1,1,2,3,4,5,3,2,3,4,2,1,2,3]
>>> print Counter(myList)
Counter({2: 4, 3: 4, 1: 3, 4: 2, 5: 1})
>>>
>>> print Counter(myList).items()
[(1, 3), (2, 4), (3, 4), (4, 2), (5, 1)]
>>> 
>>> print Counter(myList).keys()
[1, 2, 3, 4, 5]
>>> 
>>> print Counter(myList).values()
[3, 4, 4, 2, 1]

# iterate the counter
for k, v in Counter(myList):
  ...