Submission #856934


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#include<iostream>

using namespace std;

typedef long long ll;

ll f(ll b,ll n){
	if(n<b)return n;
	return (f(b,n/b)+n%b);
}

ll bin(ll l,ll r,ll s,ll n){
	while(r-l>0){
		ll mi=(l+r)/2;
		if(f(mi,n)>s)l=mi+1;
		else r=mi;
	}
	if(f(r,n)==s)return r;
	return -1;
}
int main(){
	ll n,s;
	cin>>n>>s;
	ll ans=-1;
	ll t;
	if(n<s){
		cout<<-1<<endl;
		return 0;
	}
	for(t=2;t*t<=n;t++){
		if(f(t,n)==s){
			cout<<t<<endl;
			return 0;
		}
	}
	ans=bin(t+1,n,s,n);
	if(ans!=-1){
		cout<<ans<<endl;
		return 0;
	}
	if(n==s)cout<<n+1<<endl;
	else cout<<-1<<endl;
}

Submission Info

Submission Time
Task D - Digit Sum
User ryogo108
Language C++14 (GCC 5.4.1)
Score 0
Code Size 599 Byte
Status WA
Exec Time 937 ms
Memory 256256 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 500
Status
AC × 5
AC × 32
WA × 14
MLE × 1
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 17 ms 256 KB
subtask1_100000000000_2.txt WA 17 ms 256 KB
subtask1_100000000000_3.txt AC 17 ms 256 KB
subtask1_100000000000_50000000000.txt WA 17 ms 256 KB
subtask1_100000000000_50000000001.txt AC 17 ms 256 KB
subtask1_100000000000_99999999999.txt AC 17 ms 256 KB
subtask1_16983563041_1.txt AC 4 ms 256 KB
subtask1_1_1.txt MLE 937 ms 256256 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 11 ms 256 KB
subtask1_49234683534_2461734011.txt AC 13 ms 256 KB
subtask1_4_1.txt AC 4 ms 256 KB
subtask1_58640129658_232122496.txt WA 14 ms 256 KB
subtask1_68719476735_35.txt AC 9 ms 256 KB
subtask1_68719476735_36.txt AC 4 ms 256 KB
subtask1_68719476735_37.txt WA 14 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 WA 15 ms 256 KB
subtask1_79285169301_27.txt AC 4 ms 256 KB
subtask1_82914867733_1676425945.txt WA 15 ms 256 KB
subtask1_8594813796_75700.txt AC 6 ms 256 KB
subtask1_87654_12345.txt WA 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 WA 18 ms 256 KB
subtask1_98750604051_977728851.txt WA 17 ms 256 KB
subtask1_99999515529_1.txt AC 17 ms 256 KB
subtask1_99999515529_316226.txt WA 17 ms 256 KB
subtask1_99999515529_316227.txt WA 17 ms 256 KB
subtask1_99999515529_316228.txt WA 17 ms 256 KB
subtask1_99999515529_49999757765.txt WA 17 ms 256 KB
subtask1_99999515529_49999757766.txt AC 17 ms 256 KB
subtask1_99999515530_2.txt AC 20 ms 256 KB
subtask1_99999999977_1.txt AC 19 ms 256 KB
subtask1_99999999977_2.txt AC 17 ms 256 KB
subtask1_99999999977_49999999989.txt WA 17 ms 256 KB
subtask1_99999999977_49999999990.txt AC 17 ms 256 KB
subtask1_99999999999_1.txt AC 17 ms 256 KB
subtask1_99999999999_100000000000.txt AC 4 ms 256 KB