I like your test suite. Using large X forces a better solution.
Thank you Jonathan. I have discovered this philosophy thanks to James and @bmtran problems.
is there any mathematical algorithm that i dont know about to calculate such big range(10^13)?
i minimized my code as best as i can.still fails for such large number.
Project Euler: Problem 4, Palindromic numbers
Find the sum of the elements in the "second" diagonal
Back to basics 12 - Input Arguments
Check if number exists in vector
BLOCK x3 (Version 1)
Add more zeros
Longest Collatz Sequence
Chess ELO rating system
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