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Codeforces (c) Copyright 2010-2026 Mike Mirzayanov
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Given the small constraints, you can just generate the string until the nth-ish digit by adding each number to it
then access the nth index
I would recommend solving the harder problem, with n<10^18
How will we approach for large constraints sir ?
I think revealing the answer right away will miss the point, so instead I'll direct you by giving a little hint: try to figure out which number contains the nth digit then figure out which digit in the number the nth digit contains
Problem link: https://cses.fi/problemset/task/2431
My solution for reference: https://cses.fi/paste/62e169b7b0d1f9ef398110/