Return the number of days in a given month in 2017. If the input is not a valid month number, return -1.
Input: m = 1
Outpu: d = 31
Input: m = 2
Output: d = 28
Input: m = 13
Output: d = -1
You cannot use IF statements
Replicate elements in vectors
How many jokers?
ベクトル [1 2 3 4 5 6 7 8 9 10] の作成
Triangle of numbers
Separate even from odd numbers in a vector - with a loop
Capitilize the first letter of every word in a string
How many Integers?
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