A perfect number occurs whent the sum of all divisors of a positive integer, except the number itself, equals the number.
28 = 1 + 2 + 4 + 7 + 14;
so return true
10 ~= 1 + 2 + 5
so return false
given 3 sides, find area of this triangle
Getting logical indexes
Return the first and last character of a string
Put m balls into n boxes
Return fibonacci sequence do not use loop and condition
Big Integer Sqrt
Find the maximum two numbers of every column of a matrix
Seperate array to small section according to its index position
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