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]
Number of 1s in a binary string
Whether the input is vector?
Create matrix of replicated elements
Reverse a string
calculate the length of matrix
Find the max element of the array
Calculate the square root of a number
Calculate the average value of the elements in the array
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