A little warm-up to begin...
An n-digit number is pandigital if it makes use of all the digits 1 to n exactly ONCE.
For example, the 5-digit number 15234, is 1 through 5 pandigital.
Given a positive integer find whether it is a pandigital number.
Better bullseye matrix
Specific Element Count
Create a two dimensional zero matrix
Count decimal digits of a number
How many monitors are connected ?
Generalised Hamming Number
Rank of magic square (for beginners)
Recycled Numbers (CodeJam Qualification Round 2012)
Narcissistic number ?
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