Submission #856888


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#include <iostream>
#include <fstream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <cstring>
#include <string>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <algorithm>
using namespace std;
 
#define REP(i,n) for(int i=0; i<n; ++i)
#define FOR(i,a,b) for(int i=a; i<=b; ++i)
#define FORR(i,a,b) for (int i=a; i>=b; --i)
#define pi M_PI
 
typedef long long ll;
typedef vector<int> VI;
typedef vector<ll> VL;
typedef vector<VI> VVI;
typedef pair<int,int> P;
typedef pair<ll,ll> PL;

ll f(ll b, ll 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+1)/2 < s){
        ans = -1;
    }else{
        FOR(i,2,sqrt(n)){
            if (f(i, n) == s){
                ans = i;
                break;
            }
        }
        if (ans == -1){
            for (ll i = sqrt(n-1); i>0; i--){
                ll x = (n+i)/(i+1);
                if (s > x) continue;
                ans = n/(i+1) + 1 + x - s;
                if (ans > n/i) continue;
                break;
            }
        }
    }

    cout << ans << endl;

    return 0;
}

Submission Info

Submission Time
Task D - Digit Sum
User TangentDay
Language C++14 (GCC 5.4.1)
Score 0
Code Size 1279 Byte
Status WA
Exec Time 34 ms
Memory 256 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 500
Status
AC × 5
AC × 36
WA × 11
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 4 ms 256 KB
subtask1_100000000000_2.txt WA 34 ms 256 KB
subtask1_100000000000_3.txt AC 34 ms 256 KB
subtask1_100000000000_50000000000.txt AC 24 ms 256 KB
subtask1_100000000000_50000000001.txt AC 4 ms 256 KB
subtask1_100000000000_99999999999.txt AC 4 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 4 ms 256 KB
subtask1_1_31415926535.txt AC 4 ms 256 KB
subtask1_239484768_194586924.txt AC 4 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 20 ms 256 KB
subtask1_49234683534_2461734011.txt WA 18 ms 256 KB
subtask1_4_1.txt AC 4 ms 256 KB
subtask1_58640129658_232122496.txt WA 19 ms 256 KB
subtask1_68719476735_35.txt AC 10 ms 256 KB
subtask1_68719476735_36.txt AC 4 ms 256 KB
subtask1_68719476735_37.txt WA 28 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 21 ms 256 KB
subtask1_79285169301_27.txt AC 4 ms 256 KB
subtask1_82914867733_1676425945.txt WA 22 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 24 ms 256 KB
subtask1_98750604051_977728851.txt WA 24 ms 256 KB
subtask1_99999515529_1.txt AC 19 ms 256 KB
subtask1_99999515529_316226.txt WA 34 ms 256 KB
subtask1_99999515529_316227.txt AC 19 ms 256 KB
subtask1_99999515529_316228.txt WA 34 ms 256 KB
subtask1_99999515529_49999757765.txt AC 25 ms 256 KB
subtask1_99999515529_49999757766.txt AC 4 ms 256 KB
subtask1_99999515530_2.txt AC 19 ms 256 KB
subtask1_99999999977_1.txt AC 34 ms 256 KB
subtask1_99999999977_2.txt AC 34 ms 256 KB
subtask1_99999999977_49999999989.txt AC 24 ms 256 KB
subtask1_99999999977_49999999990.txt AC 4 ms 256 KB
subtask1_99999999999_1.txt AC 34 ms 256 KB
subtask1_99999999999_100000000000.txt AC 4 ms 256 KB