Submission #856731


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

typedef long long ll;
const int MAX_N = 100030;    // Change as necessary

void check1(ll b,ll n,ll s){
  while(n){
    s -= n % b;
    n /= b;
  }
  
  if(s) return;
  
  cout << b << endl;
  exit(0);
}

bool check2(ll a1,ll n,ll s){
  n -= s;
  if(n <= 0) return 0;
  
  return (n % a1 == 0);
}

int main(){
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  
  ll n,s; cin >> n >> s;
  for(ll b=2;b<=1000000;b++)
    check1(b,n,s);
  
  vector<ll> poss;
  for(ll a1=1;a1<=1000000;a1++)
    if(check2(a1,n,s)){
      ll b = (n-s)/a1+1;
      ll a2 = s - a1;
      if(!(0 <= a2 && a2 < b)) continue;
      if(!(0 <= a1 && a1 < b)) continue;
      if(b > 1000000)
        poss.push_back(b);
    }
  
  if(n == s) poss.push_back(n+1);
  
  if(poss.empty())
    cout << -1 << endl;
  else
    cout << *min_element(poss.begin(),poss.end()) << endl;
  
  return 0;
}

Submission Info

Submission Time
Task D - Digit Sum
User MathCrusader
Language C++14 (GCC 5.4.1)
Score 500
Code Size 964 Byte
Status AC
Exec Time 65 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 47 ms 256 KB
subtask1_100000000000_2.txt AC 62 ms 256 KB
subtask1_100000000000_3.txt AC 62 ms 256 KB
subtask1_100000000000_50000000000.txt AC 64 ms 256 KB
subtask1_100000000000_50000000001.txt AC 62 ms 256 KB
subtask1_100000000000_99999999999.txt AC 62 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 25 ms 256 KB
subtask1_1_31415926535.txt AC 25 ms 256 KB
subtask1_239484768_194586924.txt AC 60 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 59 ms 256 KB
subtask1_49234683534_2461734011.txt AC 61 ms 256 KB
subtask1_4_1.txt AC 4 ms 256 KB
subtask1_58640129658_232122496.txt AC 61 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 61 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 62 ms 256 KB
subtask1_79285169301_27.txt AC 4 ms 256 KB
subtask1_82914867733_1676425945.txt AC 62 ms 256 KB
subtask1_8594813796_75700.txt AC 7 ms 256 KB
subtask1_87654_12345.txt AC 5 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 29 ms 256 KB
subtask1_87654_45678.txt AC 42 ms 256 KB
subtask1_97822032312_49157112.txt AC 63 ms 256 KB
subtask1_98750604051_977728851.txt AC 63 ms 256 KB
subtask1_99999515529_1.txt AC 22 ms 256 KB
subtask1_99999515529_316226.txt AC 62 ms 256 KB
subtask1_99999515529_316227.txt AC 22 ms 256 KB
subtask1_99999515529_316228.txt AC 27 ms 256 KB
subtask1_99999515529_49999757765.txt AC 62 ms 256 KB
subtask1_99999515529_49999757766.txt AC 62 ms 256 KB
subtask1_99999515530_2.txt AC 22 ms 256 KB
subtask1_99999999977_1.txt AC 62 ms 256 KB
subtask1_99999999977_2.txt AC 62 ms 256 KB
subtask1_99999999977_49999999989.txt AC 65 ms 256 KB
subtask1_99999999977_49999999990.txt AC 63 ms 256 KB
subtask1_99999999999_1.txt AC 63 ms 256 KB
subtask1_99999999999_100000000000.txt AC 48 ms 256 KB