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]
Back and Forth Rows
Back to basics 1 - Saving
Sum of diagonal of a square matrix
Rotate a Matrix
Find a Pythagorean triple
Calculate the square root of a number
Converts numbers into characters
Convert characters into numbers
Find the max element of the array
calculate the length of matrix
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