Kyselyt

#include <iostream>
#include <math.h> 
using namespace std;
typedef unsigned long long ull;

ull divCeiling(ull x, ull y) {
	ull q = x / y;
	if (q * y < x) ++q;
	return q;
} 
 
ull power(ull b, ull e) {
	ull result = 1;
	for (ull i = 0; i < e; ++i) {
		result *= b;
	}
	return (result);
}
 
int main() {
	ull in[1001];
	ull digitSum[19];
	ull inputLen;
	ull inputDigits = 1;
	ull numWithAns;
	ull index;
	digitSum[0] = 0;
	cin>>inputLen;
	for(ull i = 1; i < 19; i++) {
		digitSum[i] = digitSum[i-1] + (i*9*power(10, i-1));
	}
	for(ull i = 0; i < inputLen; i++) {
		cin>>in[i];
		for(ull j = 1; j < 19; j++) {
			if(in[i]<=digitSum[j] && in[i]>digitSum[j-1]) {
				inputDigits = j;
				break;
			}
		}
		numWithAns = divCeiling((in[i]-digitSum[inputDigits-1]),inputDigits)+pow(10, inputDigits-1)-1;
		index = (digitSum[inputDigits]-in[i])%inputDigits;
		cout<<numWithAns%power(10,index+1)/power(10,index)<<"\n";
	}
	return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: WRONG ANSWER