Kyselyt

#include <stdint.h>
#include <iostream>
#include <vector>
using namespace std;
const uint64_t kerto[20] = { UINT64_C(1), UINT64_C(10), UINT64_C(100), UINT64_C(1000), UINT64_C(10000), UINT64_C(100000), UINT64_C(1000000), UINT64_C(10000000), UINT64_C(100000000), UINT64_C(1000000000), UINT64_C(10000000000), UINT64_C(100000000000), UINT64_C(1000000000000),UINT64_C(10000000000000), UINT64_C(100000000000000), UINT64_C(1000000000000000), UINT64_C(10000000000000000), UINT64_C(100000000000000000), UINT64_C(1000000000000000000), UINT64_C(10000000000000000000) };
int calc(uint64_t i)
{
	uint64_t     nums = 1U;
	uint64_t     arvo = 1U;
	uint64_t     limit = 9U;
	i--;
	while (i / limit >= nums) {
		const uint64_t vlimit = limit;
		i -= nums * limit;
		nums++;
		arvo *= 10U;
		limit *= 10U;
		if (limit <= vlimit)
			break;
	}
	arvo += i / nums;
	arvo /= kerto[(nums - 1) - (i % nums)];
	return arvo % 10U;
}
int main()
{
	vector<long long> queryvector = {};
	long long int query;
	cin >> query;
	for (long int i = 0; i < query; i++)
	{
		long long int q;
		cin >> q;
		queryvector.push_back(q);
	}
	for (long long kysely : queryvector)
	{
		cout << calc(kysely) << endl;
	}
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED