Duplicate Each Item
Sometimes you need to duplicate data while keeping the original order, like making two identical cards in a row. Given a stack stack represented as a list, return a new list where each element appears twice consecutively. If the stack is empty, return an empty list.
Примеры
Ввод
[3, 7, 1, 14, 9]Вывод
[3, 3, 7, 7, 1, 1, 14, 14, 9, 9]Ввод
[]Вывод
[]Ввод
[5]Вывод
[5, 5]Нужно реализовать
def stutter(stack: list[int]) -> list[int]:
Теги
stack
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IdħolVisible tests
1
Input
[3,7,1,14,9]Expected
[3,3,7,7,1,1,14,14,9,9]2
Input
[]Expected
[]3
Input
[5]Expected
[5,5]4
Input
[1,2]Expected
[1,1,2,2]5
Input
[1,3,7,9,14]Expected
[1,1,3,3,7,7,9,9,14,14]6
Input
[0,0,0,0,0]Expected
[0,0,0,0,0,0,0,0,0,0]Focus radio
Paused · SomaFM · Fluid