Submission #1662010


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package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

func f(b, n int) int {
	if n < b {
		return n
	}
	return f(b, n/b) + n%b
}

func main() {
	scn := newScanner()
	n := scn.nextInt()
	s := scn.nextInt()
	ans := -1
	if n < s {
		ans = -1
	} else if n == s {
		ans = n + 1
	} else {
		for i := 2; i*i <= n; i++ {
			if f(i, n) == s {
				ans = i
				break
			}
		}
		if ans == -1 {
			for i := int(math.Sqrt(float64(n))); i > 0; i-- {
				if (n-s)%i == 0 && f((n-s)/i+1, n) == s {
					ans = n - s/i + 1
				}
			}
		}
	}
	fmt.Println(ans)
}

func max(a ...int) int {
	r := a[0]
	for i := 0; i < len(a); i++ {
		if r < a[i] {
			r = a[i]
		}
	}
	return r
}

func min(a ...int) int {
	r := a[0]
	for i := 0; i < len(a); i++ {
		if r > a[i] {
			r = a[i]
		}
	}
	return r
}

type scanner struct {
	r   *bufio.Reader
	buf []byte
	p   int
}

func newScanner() *scanner {
	rdr := bufio.NewReaderSize(os.Stdin, 10000)
	return &scanner{r: rdr}
}
func (s *scanner) next() string {
	s.pre()
	start := s.p
	for ; s.p < len(s.buf); s.p++ {
		if s.buf[s.p] == ' ' {
			break
		}
	}
	result := string(s.buf[start:s.p])
	s.p++
	return result
}
func (s *scanner) nextLine() string {
	s.pre()
	start := s.p
	s.p = len(s.buf)
	return string(s.buf[start:])
}
func (s *scanner) nextInt() int {
	v, _ := strconv.Atoi(s.next())
	return v
}
func (s *scanner) nextInt64() int64 {
	v, _ := strconv.ParseInt(s.next(), 10, 64)
	return v
}
func (s *scanner) pre() {
	if s.p >= len(s.buf) {
		s.readLine()
		s.p = 0
	}
}
func (s *scanner) readLine() {
	s.buf = make([]byte, 0)
	for {
		l, p, e := s.r.ReadLine()
		if e != nil {
			panic(e)
		}
		s.buf = append(s.buf, l...)
		if !p {
			break
		}
	}
}

Submission Info

Submission Time
Task D - Digit Sum
User fmhr
Language Go (1.6)
Score 0
Code Size 1806 Byte
Status WA
Exec Time 20 ms
Memory 640 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 1 ms 640 KB
subtask1_100000000000_100000000000.txt AC 1 ms 640 KB
subtask1_100000000000_2.txt WA 20 ms 640 KB
subtask1_100000000000_3.txt AC 20 ms 640 KB
subtask1_100000000000_50000000000.txt AC 20 ms 640 KB
subtask1_100000000000_50000000001.txt AC 20 ms 640 KB
subtask1_100000000000_99999999999.txt AC 20 ms 640 KB
subtask1_16983563041_1.txt AC 1 ms 640 KB
subtask1_1_1.txt AC 1 ms 640 KB
subtask1_1_2.txt AC 1 ms 640 KB
subtask1_1_31415926535.txt AC 1 ms 640 KB
subtask1_239484768_194586924.txt AC 2 ms 640 KB
subtask1_2_1.txt AC 1 ms 640 KB
subtask1_2_2.txt AC 1 ms 640 KB
subtask1_31415926535_1.txt AC 12 ms 640 KB
subtask1_49234683534_2461734011.txt AC 15 ms 640 KB
subtask1_4_1.txt AC 1 ms 640 KB
subtask1_58640129658_232122496.txt WA 16 ms 640 KB
subtask1_68719476735_35.txt AC 8 ms 640 KB
subtask1_68719476735_36.txt AC 1 ms 640 KB
subtask1_68719476735_37.txt WA 17 ms 640 KB
subtask1_68719476736_1.txt AC 1 ms 640 KB
subtask1_68719476736_2.txt AC 1 ms 640 KB
subtask1_72850192441_16865701.txt WA 17 ms 640 KB
subtask1_79285169301_27.txt AC 1 ms 640 KB
subtask1_82914867733_1676425945.txt WA 18 ms 640 KB
subtask1_8594813796_75700.txt AC 4 ms 640 KB
subtask1_87654_12345.txt WA 1 ms 640 KB
subtask1_87654_138.txt AC 1 ms 640 KB
subtask1_87654_30.txt AC 1 ms 640 KB
subtask1_87654_4294967308.txt AC 1 ms 640 KB
subtask1_87654_45678.txt AC 1 ms 640 KB
subtask1_97822032312_49157112.txt WA 20 ms 640 KB
subtask1_98750604051_977728851.txt WA 20 ms 640 KB
subtask1_99999515529_1.txt AC 17 ms 640 KB
subtask1_99999515529_316226.txt WA 20 ms 640 KB
subtask1_99999515529_316227.txt WA 20 ms 640 KB
subtask1_99999515529_316228.txt WA 20 ms 640 KB
subtask1_99999515529_49999757765.txt AC 20 ms 640 KB
subtask1_99999515529_49999757766.txt AC 20 ms 640 KB
subtask1_99999515530_2.txt AC 16 ms 640 KB
subtask1_99999999977_1.txt AC 20 ms 640 KB
subtask1_99999999977_2.txt AC 20 ms 640 KB
subtask1_99999999977_49999999989.txt AC 20 ms 640 KB
subtask1_99999999977_49999999990.txt AC 20 ms 640 KB
subtask1_99999999999_1.txt AC 20 ms 640 KB
subtask1_99999999999_100000000000.txt AC 1 ms 640 KB