Submission #858777


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#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;

const long long INF = 0x3f3f3f3f3f3f3f3fLL;

long long n , s , n_s , t , rem , ans;
int tmp , cnt;

bool judge(long long b) {//判断b进制下的各位和是否等于s
    rem = n;
    t = 0;
    while(rem > 0) {
        t += rem % b;
        rem /= b;
    }
    return t == s;
}

void solve() {
    tmp = sqrt(0.0 + n);
    n_s = n - s;
    ans = (n == s ? n + 1 : INF);
    for(int i = 2 ; i <= tmp ;++i) {//枚举到sqrt(n)
        if(judge(i)) {
            ans = min(ans , (long long) i);
        }
        if(n_s % i == 0 && n_s / i + 1 >= tmp && judge(n_s / i + 1)) {//枚举所有的大于sqrt(b)且是n-s的因子的数
            ans = min(ans , n_s / i + 1);
        }
    }
    if(n_s + 1 >= tmp && judge(n_s + 1)) {
        ans = min(ans , n_s + 1);
    }
    printf("%lld\n" , ans == INF ? -1 : ans);
}

int main() {
    while(2 == scanf("%lld%lld", &n, &s)) {
        solve();
    }
    return 0;
}

Submission Info

Submission Time
Task D - Digit Sum
User idealism
Language C++14 (GCC 5.4.1)
Score 0
Code Size 1042 Byte
Status TLE
Exec Time 2105 ms
Memory 128 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 500
Status
AC × 5
AC × 45
TLE × 2
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 28 ms 128 KB
subtask1_100000000000_100000000000.txt AC 28 ms 128 KB
subtask1_100000000000_2.txt AC 28 ms 128 KB
subtask1_100000000000_3.txt AC 28 ms 128 KB
subtask1_100000000000_50000000000.txt AC 28 ms 128 KB
subtask1_100000000000_50000000001.txt AC 28 ms 128 KB
subtask1_100000000000_99999999999.txt AC 28 ms 128 KB
subtask1_16983563041_1.txt AC 13 ms 128 KB
subtask1_1_1.txt TLE 2105 ms 128 KB
subtask1_1_2.txt AC 2 ms 128 KB
subtask1_1_31415926535.txt AC 2 ms 128 KB
subtask1_239484768_194586924.txt AC 4 ms 128 KB
subtask1_2_1.txt AC 2 ms 128 KB
subtask1_2_2.txt TLE 2104 ms 128 KB
subtask1_31415926535_1.txt AC 17 ms 128 KB
subtask1_49234683534_2461734011.txt AC 20 ms 128 KB
subtask1_4_1.txt AC 2 ms 128 KB
subtask1_58640129658_232122496.txt AC 22 ms 128 KB
subtask1_68719476735_35.txt AC 24 ms 128 KB
subtask1_68719476735_36.txt AC 24 ms 128 KB
subtask1_68719476735_37.txt AC 25 ms 128 KB
subtask1_68719476736_1.txt AC 24 ms 128 KB
subtask1_68719476736_2.txt AC 24 ms 128 KB
subtask1_72850192441_16865701.txt AC 24 ms 128 KB
subtask1_79285169301_27.txt AC 25 ms 128 KB
subtask1_82914867733_1676425945.txt AC 26 ms 128 KB
subtask1_8594813796_75700.txt AC 10 ms 128 KB
subtask1_87654_12345.txt AC 2 ms 128 KB
subtask1_87654_138.txt AC 2 ms 128 KB
subtask1_87654_30.txt AC 3 ms 128 KB
subtask1_87654_4294967308.txt AC 2 ms 128 KB
subtask1_87654_45678.txt AC 3 ms 128 KB
subtask1_97822032312_49157112.txt AC 28 ms 128 KB
subtask1_98750604051_977728851.txt AC 28 ms 128 KB
subtask1_99999515529_1.txt AC 28 ms 128 KB
subtask1_99999515529_316226.txt AC 29 ms 128 KB
subtask1_99999515529_316227.txt AC 28 ms 128 KB
subtask1_99999515529_316228.txt AC 28 ms 128 KB
subtask1_99999515529_49999757765.txt AC 28 ms 128 KB
subtask1_99999515529_49999757766.txt AC 28 ms 128 KB
subtask1_99999515530_2.txt AC 28 ms 128 KB
subtask1_99999999977_1.txt AC 28 ms 128 KB
subtask1_99999999977_2.txt AC 28 ms 128 KB
subtask1_99999999977_49999999989.txt AC 28 ms 128 KB
subtask1_99999999977_49999999990.txt AC 28 ms 128 KB
subtask1_99999999999_1.txt AC 28 ms 128 KB
subtask1_99999999999_100000000000.txt AC 28 ms 128 KB