Test for balanced parentheses
How to find the position of an element in a vector without using the find function
Sum of diagonal of a square matrix
How many digits are there?
Mo money, mo math #2! (★★★)
Matrix with increasing numbers (★★★★)
Longest run of consecutive numbers (★★★★★)
Vector raised to a power, element-wise (★)
Make a checkerboard matrix (★★★★★)
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