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Solution to this question
By kuch_bhi_ni, history, 3 years ago, In English

How to solve this problem ?

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3 years ago, # |
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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

str += to_string(i);

then access the nth index

I would recommend solving the harder problem, with n<10^18

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