Kyselyt

#include <bits/stdc++.h>
using namespace std;

long long int func1(int a) {
	long long int b = 10;
	for (int i = 1; i < a; i++) {
		b += 9 * (long long int)pow(10, i) * (i + 1);
	}
	return b;
}

int main() {
	int q;
	cin >> q;

	long long int k[q];
	for (int i = 0; i < q; i++) {
		cin >> k[i];
	}

	for (int i = 0; i < q; i++) {
		int a = 1;
		if (k[i] < 10) {
			cout << k[i] << endl;
		} else {
			while (true) {
				if (k[i] < func1(a)) {
					long long int l = k[i]-func1(a-1);
					long long int m = l%a;
					string num = to_string(((l-m)/a) + (long long int)pow(10, a-1));
					cout << num[m] << endl;
					break;
				}
				a++;
			}
		}
	}
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED