結果

問題 No.1168 Digit Sum Sequence
ユーザー maguroguma
提出日時 2020-08-14 21:22:54
言語 Go
(1.23.4)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 5,110 bytes
コンパイル時間 11,920 ms
コンパイル使用メモリ 222,404 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-10-10 12:40:16
合計ジャッジ時間 12,893 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 29
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

/*
URL:
https://yukicoder.me/problems/no/1168
*/
package main
import (
    "bufio"
    "fmt"
    "io"
    "math"
    "os"
    "strconv"
)
/*******************************************************************/
var (
    n int
)
func main() {
    n = ReadInt()
    cur := n
    for i := 0; i < 99; i++ {
        cur = DigitSum(cur)
    }
    fmt.Println(cur)
}
// DigitSum returns digit sum of a decimal number.
// DigitSum only accept a positive integer.
func DigitSum(n int) int {
    if n < 0 {
        return -1
    }
    res := 0
    for n > 0 {
        res += n % 10
        n /= 10
    }
    return res
}
const (
    // General purpose
    MOD = 1000000000 + 7
    // MOD          = 998244353
    ALPHABET_NUM = 26
    INF_INT64    = math.MaxInt64
    INF_BIT60    = 1 << 60
    INF_INT32    = math.MaxInt32
    INF_BIT30    = 1 << 30
    NIL          = -1
    // for dijkstra, prim, and so on
    WHITE = 0
    GRAY  = 1
    BLACK = 2
)
/*******************************************************************/
/********** bufio setting **********/
func init() {
    // bufio.ScanWords <---> bufio.ScanLines
    ReadString = newReadString(os.Stdin, bufio.ScanWords)
    stdout = bufio.NewWriter(os.Stdout)
}
/********** FAU standard libraries **********/
//fmt.Sprintf("%b\n", 255)  // binary expression
/********** I/O usage **********/
//str := ReadString()
//i := ReadInt()
//X := ReadIntSlice(n)
//S := ReadRuneSlice()
//a := ReadFloat64()
//A := ReadFloat64Slice(n)
//str := ZeroPaddingRuneSlice(num, 32)
//str := PrintIntsLine(X...)
/*********** Input ***********/
var (
    // ReadString returns a WORD string.
    ReadString func() string
    stdout     *bufio.Writer
)
func newReadString(ior io.Reader, sf bufio.SplitFunc) func() string {
    r := bufio.NewScanner(ior)
    r.Buffer(make([]byte, 1024), int(1e+9)) // for Codeforces
    r.Split(sf)
    return func() string {
        if !r.Scan() {
            panic("Scan failed")
        }
        return r.Text()
    }
}
// ReadInt returns an integer.
func ReadInt() int {
    return int(readInt64())
}
func ReadInt2() (int, int) {
    return int(readInt64()), int(readInt64())
}
func ReadInt3() (int, int, int) {
    return int(readInt64()), int(readInt64()), int(readInt64())
}
func ReadInt4() (int, int, int, int) {
    return int(readInt64()), int(readInt64()), int(readInt64()), int(readInt64())
}
// ReadInt64 returns as integer as int64.
func ReadInt64() int64 {
    return readInt64()
}
func ReadInt64_2() (int64, int64) {
    return readInt64(), readInt64()
}
func ReadInt64_3() (int64, int64, int64) {
    return readInt64(), readInt64(), readInt64()
}
func ReadInt64_4() (int64, int64, int64, int64) {
    return readInt64(), readInt64(), readInt64(), readInt64()
}
func readInt64() int64 {
    i, err := strconv.ParseInt(ReadString(), 0, 64)
    if err != nil {
        panic(err.Error())
    }
    return i
}
// ReadIntSlice returns an integer slice that has n integers.
func ReadIntSlice(n int) []int {
    b := make([]int, n)
    for i := 0; i < n; i++ {
        b[i] = ReadInt()
    }
    return b
}
// ReadInt64Slice returns as int64 slice that has n integers.
func ReadInt64Slice(n int) []int64 {
    b := make([]int64, n)
    for i := 0; i < n; i++ {
        b[i] = ReadInt64()
    }
    return b
}
// ReadFloat64 returns an float64.
func ReadFloat64() float64 {
    return float64(readFloat64())
}
func readFloat64() float64 {
    f, err := strconv.ParseFloat(ReadString(), 64)
    if err != nil {
        panic(err.Error())
    }
    return f
}
// ReadFloatSlice returns an float64 slice that has n float64.
func ReadFloat64Slice(n int) []float64 {
    b := make([]float64, n)
    for i := 0; i < n; i++ {
        b[i] = ReadFloat64()
    }
    return b
}
// ReadRuneSlice returns a rune slice.
func ReadRuneSlice() []rune {
    return []rune(ReadString())
}
/*********** Output ***********/
// PrintIntsLine returns integers string delimited by a space.
func PrintIntsLine(A ...int) string {
    res := []rune{}
    for i := 0; i < len(A); i++ {
        str := strconv.Itoa(A[i])
        res = append(res, []rune(str)...)
        if i != len(A)-1 {
            res = append(res, ' ')
        }
    }
    return string(res)
}
// PrintIntsLine returns integers string delimited by a space.
func PrintInts64Line(A ...int64) string {
    res := []rune{}
    for i := 0; i < len(A); i++ {
        str := strconv.FormatInt(A[i], 10) // 64bit int version
        res = append(res, []rune(str)...)
        if i != len(A)-1 {
            res = append(res, ' ')
        }
    }
    return string(res)
}
// PrintfBufStdout is function for output strings to buffered os.Stdout.
// You may have to call stdout.Flush() finally.
func PrintfBufStdout(format string, a ...interface{}) {
    fmt.Fprintf(stdout, format, a...)
}
/*********** Debugging ***********/
// PrintfDebug is wrapper of fmt.Fprintf(os.Stderr, format, a...)
func PrintfDebug(format string, a ...interface{}) {
    fmt.Fprintf(os.Stderr, format, a...)
}
// ZeroPaddingRuneSlice returns binary expressions of integer n with zero padding.
// For debugging use.
func ZeroPaddingRuneSlice(n, digitsNum int) []rune {
    sn := fmt.Sprintf("%b", n)
    residualLength := digitsNum - len(sn)
    if residualLength <= 0 {
        return []rune(sn)
    }
    zeros := make([]rune, residualLength)
    for i := 0; i < len(zeros); i++ {
        zeros[i] = '0'
    }
    res := []rune{}
    res = append(res, zeros...)
    res = append(res, []rune(sn)...)
    return res
}
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