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]
Triangle Numbers Below N
Given a matrix, return the last eigen value
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find the roots of a quadratic equation
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Convert characters into numbers
the average value of the elements
Find the max element of the array
Converts numbers into characters
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