Submission #857134


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#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define pii pair<int,int>
#define LL long long
#define st first
#define nd second
using namespace std;
LL f(LL x,LL y){
    if(x<y)
        return x;
    return f(x/y,y)+x%y;
}
LL find(LL x,LL y){
    LL ret=1e18;
    LL f=1,l=1e18;
    while(f<=l){
        LL md=(l+f)/2;
        //cout<<x<<" "<<y<<" "<<l<<" "<<f<<endl;
        if(x/md>y)
            f=md+1;
        else if(x/md==y){
            ret=md;
            l=md-1;
        }
        else
            l=md-1;
        if(f==l)
            break;
    }
    if(x/f==y&&ret>f)
        return f;

    return ret;
}
int main(){
    LL n,s;
    cin>>n>>s;
    LL nw=sqrt(n);
    for(int i=2;i<=nw;++i){
        if(f(n,i)==s){
            cout<<i<<endl;
            return 0;
        }
    }
    for(int i=nw-1;i>=1;--i){
        LL base=find(n,i),add=n%base;
        //cout<<i<<" "<<base<<" "<<add<<" "<<s-i<<endl;
        if(s-i>add)
            base+=s-i-add;
        if(n/base==i&&n%base==s-i){
            cout<<base<<endl;
            return 0;
        }
    }
    if(s==n) {
        cout<<s+1<<endl;
        return 0;
    }
    puts("-1");
}

Submission Info

Submission Time
Task D - Digit Sum
User Nitemare
Language C++14 (GCC 5.4.1)
Score 0
Code Size 1232 Byte
Status WA
Exec Time 406 ms
Memory 256 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 500
Status
AC × 4
WA × 1
AC × 32
WA × 15
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 405 ms 256 KB
subtask1_100000000000_2.txt WA 404 ms 256 KB
subtask1_100000000000_3.txt WA 404 ms 256 KB
subtask1_100000000000_50000000000.txt AC 404 ms 256 KB
subtask1_100000000000_50000000001.txt AC 405 ms 256 KB
subtask1_100000000000_99999999999.txt AC 405 ms 256 KB
subtask1_16983563041_1.txt AC 4 ms 256 KB
subtask1_1_1.txt AC 5 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 WA 4 ms 256 KB
subtask1_2_2.txt AC 4 ms 256 KB
subtask1_31415926535_1.txt WA 228 ms 256 KB
subtask1_49234683534_2461734011.txt WA 286 ms 256 KB
subtask1_4_1.txt AC 4 ms 256 KB
subtask1_58640129658_232122496.txt WA 311 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 335 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 346 ms 256 KB
subtask1_79285169301_27.txt AC 4 ms 256 KB
subtask1_82914867733_1676425945.txt WA 369 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 AC 398 ms 256 KB
subtask1_98750604051_977728851.txt AC 402 ms 256 KB
subtask1_99999515529_1.txt AC 16 ms 256 KB
subtask1_99999515529_316226.txt WA 404 ms 256 KB
subtask1_99999515529_316227.txt AC 16 ms 256 KB
subtask1_99999515529_316228.txt WA 404 ms 256 KB
subtask1_99999515529_49999757765.txt AC 404 ms 256 KB
subtask1_99999515529_49999757766.txt AC 405 ms 256 KB
subtask1_99999515530_2.txt AC 16 ms 256 KB
subtask1_99999999977_1.txt WA 404 ms 256 KB
subtask1_99999999977_2.txt WA 406 ms 256 KB
subtask1_99999999977_49999999989.txt AC 404 ms 256 KB
subtask1_99999999977_49999999990.txt AC 404 ms 256 KB
subtask1_99999999999_1.txt WA 404 ms 256 KB
subtask1_99999999999_100000000000.txt AC 405 ms 256 KB