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]
Find common elements in matrix rows
Sum of diagonal of a square matrix
find the maximum element of the matrix
Find last zero for each column
Convert characters into numbers
to the 2 all elements
the average value of the elements
Find the max element of the array
calculate the length of matrix
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