题解 | 单组_补充前导零

package main
 
import (
    "bufio"
    "fmt"
    "os"
 
)
 
func main() {
    reader := bufio.NewReader(os.Stdin)
    var n int64
    fmt.Fscan(reader , &n)
    fmt.Printf("%09d",n)
  //fmt.Println(fmt.Sprintf("%.3f", num))
 
}