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
Back to basics 26 - Keywords
Whether the input is vector?
Test if two numbers have the same digits
06 - Matrix Equations 3
length of a vector
Put m balls into n boxes (again)
Find the maximum two numbers of every column of a matrix
Return fibonacci sequence do not use loop and condition
Solve Sudoku puzzle step by
Return fibonacci sequence do not use loop and condition version 3
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