Submission #856501


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#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define rep(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define each(itr,c) for(__typeof(c.begin()) itr=c.begin(); itr!=c.end(); ++itr)
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define fi first
#define se second

const ll LIM=1000000;

ll f(ll b, ll n)
{
    // printf("call f(%lld, %lld)\n", b,n);
    if(n<b) return n;
    else return f(b,n/b)+(n%b);
}

int main()
{
    ll n,s;
    cin >>n >>s;

    ll ans=-1;
    if(n==s) ans=n+1;
    else if(n>s)
    {
        if(n<LIM)
        {
            for(int b=2; b<=n; ++b)
            {
                if(f(b,n)==s)
                {
                    ans=b;
                    break;
                }
            }
        }
        else
        {
            ll now=n, a=1;
            while(now>LIM)
            {
                ll fnow=f(now,n);
                ll p=now-fnow-1, q=1+a;

                ll k=p/q;
                if(p%q!=0) ++k;

                // printf("now= %lld,fnow= %lld ,k=%lld\n", now,fnow,k);


                if(fnow<=s && s<=fnow+a*k)
                {
                    if((s-fnow)%a==0)
                    {
                        ll kk=(s-fnow)/a;
                        ans=now-kk;
                    }
                }

                now-=k+1;
                ++a;
            }

            for(ll b=2; b<=now; ++b)
            {
                if(f(b,n)==s)
                {
                    ans=b;
                    break;
                }
            }
        }
    }

    cout << ans << endl;
    return 0;
}

Submission Info

Submission Time
Task D - Digit Sum
User imulan
Language C++14 (GCC 5.4.1)
Score 500
Code Size 1688 Byte
Status AC
Exec Time 37 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 9 ms 256 KB
subtask1_100000000000_100000000000.txt AC 4 ms 256 KB
subtask1_100000000000_2.txt AC 37 ms 256 KB
subtask1_100000000000_3.txt AC 36 ms 256 KB
subtask1_100000000000_50000000000.txt AC 35 ms 256 KB
subtask1_100000000000_50000000001.txt AC 35 ms 256 KB
subtask1_100000000000_99999999999.txt AC 35 ms 256 KB
subtask1_16983563041_1.txt AC 5 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 24 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 29 ms 256 KB
subtask1_49234683534_2461734011.txt AC 30 ms 256 KB
subtask1_4_1.txt AC 4 ms 256 KB
subtask1_58640129658_232122496.txt AC 31 ms 256 KB
subtask1_68719476735_35.txt AC 12 ms 256 KB
subtask1_68719476735_36.txt AC 8 ms 256 KB
subtask1_68719476735_37.txt AC 32 ms 256 KB
subtask1_68719476736_1.txt AC 7 ms 256 KB
subtask1_68719476736_2.txt AC 8 ms 256 KB
subtask1_72850192441_16865701.txt AC 33 ms 256 KB
subtask1_79285169301_27.txt AC 8 ms 256 KB
subtask1_82914867733_1676425945.txt AC 33 ms 256 KB
subtask1_8594813796_75700.txt AC 6 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 6 ms 256 KB
subtask1_97822032312_49157112.txt AC 35 ms 256 KB
subtask1_98750604051_977728851.txt AC 35 ms 256 KB
subtask1_99999515529_1.txt AC 21 ms 256 KB
subtask1_99999515529_316226.txt AC 36 ms 256 KB
subtask1_99999515529_316227.txt AC 22 ms 256 KB
subtask1_99999515529_316228.txt AC 25 ms 256 KB
subtask1_99999515529_49999757765.txt AC 35 ms 256 KB
subtask1_99999515529_49999757766.txt AC 35 ms 256 KB
subtask1_99999515530_2.txt AC 22 ms 256 KB
subtask1_99999999977_1.txt AC 35 ms 256 KB
subtask1_99999999977_2.txt AC 35 ms 256 KB
subtask1_99999999977_49999999989.txt AC 35 ms 256 KB
subtask1_99999999977_49999999990.txt AC 35 ms 256 KB
subtask1_99999999999_1.txt AC 35 ms 256 KB
subtask1_99999999999_100000000000.txt AC 4 ms 256 KB