Duplicate all elements in the array
The solution to this problem doesn't make any sense!!!
If you are using the word "duplicate" to mean multiply by 2, then the correct answer is [2,4,6], not [1,4,6]
Tic Tac Toe FTW
Insert zeros into vector
calculate linear convolution two vectors
find the maximum element of the matrix
Calculate the square root of a number
the average value of the elements
to the 2 all elements
Find the max element of the array
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