Submission #857286


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#include <bits/stdc++.h>
using namespace std;
long long n, s;
int main() {
	cin >> n >> s;
	for (long long b = 2; b*b <= n; ++ b) {
		long long t = 0;
		long long x = n;
		while (x > 0) { t += x % b; x /= b; }
		if (t == s) {
			cout << b << endl;
			return 0;
		}
	}
	long long r = 1LL<<60;
	if (n == s) {
		r = n + 1;
	}
	if (n >= s) {
		long long ns = n - s;
		for (long long a = 1; a*a <= ns; ++ a) {
			if (ns % a == 0) {
				long long b = ns / a + 1;
				if (n / b < b && n / b + n % b == s) {
					r = min(r, ns / a + 1);
				}
			}
		}
	}
	if (r != 1LL<<60) {
		cout << r << endl;
		return 0;
	}
	cout << -1 << endl;
}

Submission Info

Submission Time
Task D - Digit Sum
User hasi
Language C++14 (GCC 5.4.1)
Score 500
Code Size 662 Byte
Status AC
Exec Time 27 ms
Memory 256 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 500 / 500
Status
AC × 5
AC × 47
Set Name Test Cases
Sample subtask1_87654_30.txt, subtask1_87654_138.txt, subtask1_87654_45678.txt, subtask1_31415926535_1.txt, subtask1_1_31415926535.txt
All subtask1_100000000000_1.txt, subtask1_100000000000_100000000000.txt, subtask1_100000000000_2.txt, subtask1_100000000000_3.txt, subtask1_100000000000_50000000000.txt, subtask1_100000000000_50000000001.txt, subtask1_100000000000_99999999999.txt, subtask1_16983563041_1.txt, subtask1_1_1.txt, subtask1_1_2.txt, subtask1_1_31415926535.txt, subtask1_239484768_194586924.txt, subtask1_2_1.txt, subtask1_2_2.txt, subtask1_31415926535_1.txt, subtask1_49234683534_2461734011.txt, subtask1_4_1.txt, subtask1_58640129658_232122496.txt, subtask1_68719476735_35.txt, subtask1_68719476735_36.txt, subtask1_68719476735_37.txt, subtask1_68719476736_1.txt, subtask1_68719476736_2.txt, subtask1_72850192441_16865701.txt, subtask1_79285169301_27.txt, subtask1_82914867733_1676425945.txt, subtask1_8594813796_75700.txt, subtask1_87654_12345.txt, subtask1_87654_138.txt, subtask1_87654_30.txt, subtask1_87654_4294967308.txt, subtask1_87654_45678.txt, subtask1_97822032312_49157112.txt, subtask1_98750604051_977728851.txt, subtask1_99999515529_1.txt, subtask1_99999515529_316226.txt, subtask1_99999515529_316227.txt, subtask1_99999515529_316228.txt, subtask1_99999515529_49999757765.txt, subtask1_99999515529_49999757766.txt, subtask1_99999515530_2.txt, subtask1_99999999977_1.txt, subtask1_99999999977_2.txt, subtask1_99999999977_49999999989.txt, subtask1_99999999977_49999999990.txt, subtask1_99999999999_1.txt, subtask1_99999999999_100000000000.txt
Case Name Status Exec Time Memory
subtask1_100000000000_1.txt AC 4 ms 256 KB
subtask1_100000000000_100000000000.txt AC 22 ms 256 KB
subtask1_100000000000_2.txt AC 27 ms 256 KB
subtask1_100000000000_3.txt AC 27 ms 256 KB
subtask1_100000000000_50000000000.txt AC 26 ms 256 KB
subtask1_100000000000_50000000001.txt AC 26 ms 256 KB
subtask1_100000000000_99999999999.txt AC 22 ms 256 KB
subtask1_16983563041_1.txt AC 4 ms 256 KB
subtask1_1_1.txt AC 4 ms 256 KB
subtask1_1_2.txt AC 4 ms 256 KB
subtask1_1_31415926535.txt AC 4 ms 256 KB
subtask1_239484768_194586924.txt AC 5 ms 256 KB
subtask1_2_1.txt AC 4 ms 256 KB
subtask1_2_2.txt AC 4 ms 256 KB
subtask1_31415926535_1.txt AC 17 ms 256 KB
subtask1_49234683534_2461734011.txt AC 20 ms 256 KB
subtask1_4_1.txt AC 4 ms 256 KB
subtask1_58640129658_232122496.txt AC 22 ms 256 KB
subtask1_68719476735_35.txt AC 11 ms 256 KB
subtask1_68719476735_36.txt AC 4 ms 256 KB
subtask1_68719476735_37.txt AC 23 ms 256 KB
subtask1_68719476736_1.txt AC 4 ms 256 KB
subtask1_68719476736_2.txt AC 4 ms 256 KB
subtask1_72850192441_16865701.txt AC 24 ms 256 KB
subtask1_79285169301_27.txt AC 4 ms 256 KB
subtask1_82914867733_1676425945.txt AC 27 ms 256 KB
subtask1_8594813796_75700.txt AC 7 ms 256 KB
subtask1_87654_12345.txt AC 4 ms 256 KB
subtask1_87654_138.txt AC 4 ms 256 KB
subtask1_87654_30.txt AC 4 ms 256 KB
subtask1_87654_4294967308.txt AC 4 ms 256 KB
subtask1_87654_45678.txt AC 4 ms 256 KB
subtask1_97822032312_49157112.txt AC 27 ms 256 KB
subtask1_98750604051_977728851.txt AC 27 ms 256 KB
subtask1_99999515529_1.txt AC 22 ms 256 KB
subtask1_99999515529_316226.txt AC 27 ms 256 KB
subtask1_99999515529_316227.txt AC 27 ms 256 KB
subtask1_99999515529_316228.txt AC 27 ms 256 KB
subtask1_99999515529_49999757765.txt AC 26 ms 256 KB
subtask1_99999515529_49999757766.txt AC 26 ms 256 KB
subtask1_99999515530_2.txt AC 22 ms 256 KB
subtask1_99999999977_1.txt AC 27 ms 256 KB
subtask1_99999999977_2.txt AC 27 ms 256 KB
subtask1_99999999977_49999999989.txt AC 26 ms 256 KB
subtask1_99999999977_49999999990.txt AC 26 ms 256 KB
subtask1_99999999999_1.txt AC 27 ms 256 KB
subtask1_99999999999_100000000000.txt AC 22 ms 256 KB