Add only the even numbers of x
x = [1 2 3 4 5]
the positive numbers are: 2 4, so their sum is 6
Flip the main diagonal of a matrix
Multiply 2 numbers
Beginner's Problem - Squaring
How many complete pizzas (number 2)
Odd times even numbers in a matrix
Connect 4 (the boardgame)
Count the numbers
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