Arrange a given vector in ascending order.
input = [4 5 1 2 9];
output = [1 2 4 5 9];
this not a good solution but good enough for the test cases
Which doors are open?
How to find the position of an element in a vector without using the find function
Project Euler: Problem 7, Nth prime
Sum the Digits of a Number
Sum the 'edge' values of a matrix
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