So here is one good test for all you guys who are bored, or like chalenges.
I am posting this exam so my good friend Unknown Hero (who I know of) can take a little break.
It is called "The Number" (be afraid, be very afraid) and shouldn't be hard.
Here it goes. THE NUMBER
When all natural numbers (1,2,3,4,5), started from 1 to some known N number write in a line one after another
without a space, we get a array of numbers that looks like this:
For N=16 we get { 12345678910111213141516 }.
Write an algorithm/code that will calculate the exact number od digits of that array.
INPUT:
In one and only row there is one number N, 1<=N<=100,000,000.
OUTPUT:
In one and only row on screen you have to write the needed number from the text.
TESTS:
input
5 | 15 | 120
output
5 | 21 | 252
Good luck.
