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@serhii_nesteruk, :: has constant complexity, while ++ is linear. In your code you are applying ++ n times. First on the list of length 1, then 2, then 3, and so on. So overall complexity will be
::
++
O(1) + O(2) + ... + O(n-1) ~= O(n^2)
String Mingling
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@serhii_nesteruk,
::has constant complexity, while++is linear.In your code you are applying
++n times. First on the list of length 1, then 2, then 3, and so on. So overall complexity will be