#567077 (Go) No.491 10^9+1と回文

• 問題: No.491 10^9+1と回文
• ユーザー: aru aru
• 提出日時: 2020-10-16 11:58:59
• 言語: Go (1.23.4)
• 結果: AC
• 実行時間: 154 ms / 1,000 ms
• コード長: 2,114 bytes
• コンパイル時間: 12,887 ms
• コンパイル使用メモリ: 224,120 KB
• 実行使用メモリ: 18,944 KB
• 最終ジャッジ日時: 2024-07-20 20:28:50
• 合計ジャッジ時間: 31,617 ms
• ジャッジサーバーID （参考情報）: judge5 / judge1

ファイルパターン	結果
sample	AC * 3
other	AC * 103

ソースコード

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package main
import (
    "bufio"
    "fmt"
    "os"
    "sort"
    "strconv"
)
var sc = bufio.NewScanner(os.Stdin)
var wr = bufio.NewWriter(os.Stdout)
func out(x ...interface{}) {
    fmt.Fprintln(wr, x...)
}
func getI() int {
    sc.Scan()
    i, e := strconv.Atoi(sc.Text())
    if e != nil {
        panic(e)
    }
    return i
}
func getF() float64 {
    sc.Scan()
    i, e := strconv.ParseFloat(sc.Text(), 64)
    if e != nil {
        panic(e)
    }
    return i
}
func getInts(N int) []int {
    ret := make([]int, N)
    for i := 0; i < N; i++ {
        ret[i] = getI()
    }
    return ret
}
func getS() string {
    sc.Scan()
    return sc.Text()
}
// min, max, asub, absなど基本関数
func max(a, b int) int {
    if a > b {
        return a
    }
    return b
}
func min(a, b int) int {
    if a < b {
        return a
    }
    return b
}
func asub(a, b int) int {
    if a > b {
        return a - b
    }
    return b - a
}
func abs(a int) int {
    if a >= 0 {
        return a
    }
    return -a
}
func lowerBound(a []int, x int) int {
    idx := sort.Search(len(a), func(i int) bool {
        return a[i] >= x
    })
    return idx
}
func upperBound(a []int, x int) int {
    idx := sort.Search(len(a), func(i int) bool {
        return a[i] > x
    })
    return idx
}
const inf = int(1e18)
const mod = int(1e9) + 1
func f(x int) bool {
    s := strconv.Itoa(x)
    for i := 0; i < len(s); i++ {
        if s[i] != s[len(s)-1-i] {
            return false
        }
    }
    return true
}
func mk(n int) (int, int) {
    s := strconv.Itoa(n)
    s0 := s
    s1 := s
    for i := len(s) - 1; i >= 0; i-- {
        s0 += string(s[i])
        if i != len(s)-1 {
            s1 += string(s[i])
        }
    }
    r0, _ := strconv.Atoi(s0)
    r1, _ := strconv.Atoi(s1)
    return r0, r1
}
func main() {
    defer wr.Flush()
    sc.Split(bufio.ScanWords)
    sc.Buffer([]byte{}, 1000000)
    // this template is new version.
    // use getI(), getS(), getInts(), getF()
    cnt := 0
    m := make(map[int]int, 0)
    for {
        cnt++
        r0, r1 := mk(cnt)
        m[r0]++
        m[r1]++
        if cnt > int(1e5) {
            break
        }
    }
    a := make([]int, 0, len(m))
    for e := range m {
        a = append(a, e)
    }
    sort.Ints(a)
    N := getI()
    ans := 0
    for i := 0; i < len(a); i++ {
        x := a[i] * mod
        if x/mod != a[i] {
            break
        }
        if a[i]*mod > N {
            break
        }
        ans++
    }
    out(ans)
}
 
 
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