Submission #5102983


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#include "bits/stdc++.h"
using namespace std;
#ifdef _DEBUG
#include "dump.hpp"
#else
#define dump(...)
#endif

#define int long long
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define all(c) begin(c),end(c)
const int INF = sizeof(int) == sizeof(long long) ? 0x3f3f3f3f3f3f3f3fLL : 0x3f3f3f3f;
const int MOD = 1'000'000'007;
template<class T> bool chmax(T &a, const T &b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, const T &b) { if (b < a) { a = b; return true; } return false; }



signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n, s; cin >> n >> s;

	int sq = ceil(sqrt(n));

	int ans = -1;

	if (n == s) {
		ans = n + 1;
	}

	if (ans == -1) {
		rep(b, 2, sq + 1) {
			int m = n;
			int res = 0;
			while (m) {
				res += m % b;
				m /= b;
			}
			if (res == s) {
				ans = b;
				break;
			}
		}
	}

	if (ans == -1) {
		for (int p = sq; p >= 1; p--) {
			int d = n / p;
			dump(p, d);
			if (p >= d)continue;
			int r = n % d;
			int A = p + p * d + r - s;
			int B = p;
			int b = A / B;
			int q = (d - b) * p + r;
			if (A % B == 0 && q < b && q >= 0) {
				dump(p, d, q, p + q, b);
				ans = b;
				break;
			}
		}
	}

	cout << ans << endl;

	return 0;
}

Submission Info

Submission Time
Task D - Digit Sum
User minaminao
Language C++14 (GCC 5.4.1)
Score 500
Code Size 1341 Byte
Status AC
Exec Time 22 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 1 ms 256 KB
subtask1_100000000000_100000000000.txt AC 1 ms 256 KB
subtask1_100000000000_2.txt AC 22 ms 256 KB
subtask1_100000000000_3.txt AC 22 ms 256 KB
subtask1_100000000000_50000000000.txt AC 22 ms 256 KB
subtask1_100000000000_50000000001.txt AC 22 ms 256 KB
subtask1_100000000000_99999999999.txt AC 22 ms 256 KB
subtask1_16983563041_1.txt AC 1 ms 256 KB
subtask1_1_1.txt AC 1 ms 256 KB
subtask1_1_2.txt AC 1 ms 256 KB
subtask1_1_31415926535.txt AC 1 ms 256 KB
subtask1_239484768_194586924.txt AC 2 ms 256 KB
subtask1_2_1.txt AC 1 ms 256 KB
subtask1_2_2.txt AC 1 ms 256 KB
subtask1_31415926535_1.txt AC 13 ms 256 KB
subtask1_49234683534_2461734011.txt AC 16 ms 256 KB
subtask1_4_1.txt AC 1 ms 256 KB
subtask1_58640129658_232122496.txt AC 17 ms 256 KB
subtask1_68719476735_35.txt AC 6 ms 256 KB
subtask1_68719476735_36.txt AC 1 ms 256 KB
subtask1_68719476735_37.txt AC 18 ms 256 KB
subtask1_68719476736_1.txt AC 1 ms 256 KB
subtask1_68719476736_2.txt AC 1 ms 256 KB
subtask1_72850192441_16865701.txt AC 19 ms 256 KB
subtask1_79285169301_27.txt AC 1 ms 256 KB
subtask1_82914867733_1676425945.txt AC 20 ms 256 KB
subtask1_8594813796_75700.txt AC 3 ms 256 KB
subtask1_87654_12345.txt AC 1 ms 256 KB
subtask1_87654_138.txt AC 1 ms 256 KB
subtask1_87654_30.txt AC 1 ms 256 KB
subtask1_87654_4294967308.txt AC 1 ms 256 KB
subtask1_87654_45678.txt AC 1 ms 256 KB
subtask1_97822032312_49157112.txt AC 22 ms 256 KB
subtask1_98750604051_977728851.txt AC 22 ms 256 KB
subtask1_99999515529_1.txt AC 12 ms 256 KB
subtask1_99999515529_316226.txt AC 19 ms 256 KB
subtask1_99999515529_316227.txt AC 12 ms 256 KB
subtask1_99999515529_316228.txt AC 15 ms 256 KB
subtask1_99999515529_49999757765.txt AC 22 ms 256 KB
subtask1_99999515529_49999757766.txt AC 22 ms 256 KB
subtask1_99999515530_2.txt AC 12 ms 256 KB
subtask1_99999999977_1.txt AC 22 ms 256 KB
subtask1_99999999977_2.txt AC 22 ms 256 KB
subtask1_99999999977_49999999989.txt AC 22 ms 256 KB
subtask1_99999999977_49999999990.txt AC 22 ms 256 KB
subtask1_99999999999_1.txt AC 22 ms 256 KB
subtask1_99999999999_100000000000.txt AC 22 ms 256 KB