How Many Unique Values
When a list contains repeats, you often need to know how many different values are actually there. The function count_distinct receives a list of numbers nums and returns the number of distinct elements. If the list is empty, it has 0 distinct values.
Примеры
Ввод
[1, 2, 2, 3]Вывод
3Ввод
[]Вывод
0Ввод
[5, 5, 5]Вывод
1Нужно реализовать
def count_distinct(nums: list[int]) -> int:
Теги
listsset
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1
Input
[1,2,2,3]Expected
32
Input
[]Expected
03
Input
[5,5,5]Expected
14
Input
[1,2,3,4]Expected
45
Input
[7,7,8,8,9]Expected
36
Input
[7]Expected
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