Kyselyt

#include <iostream>
#include <string>


int main()
{
    unsigned int q;
    unsigned long long int k;
    unsigned long long int j = 1;
    std::string a;


    std::cin >> q;
    for (unsigned int i = 0; i < q; i++){
        std::cin >> k;
        while (a.length() <= k) {
            a += std::to_string(j);
            j++;
        }
        std::cout << a.at(k-1) << "\n";
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: TIME LIMIT EXCEEDED