If a number is divisible by the number formed by the first and last digit of that number then it is defined as a gapful number.
Find the number of gapful numbers up to n.
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Fill a zeros matrix
Edges of a n-dimensional Hypercube
How many digits are there?
Don't be Greedy!
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