1323. 6 和 9 组成的最大数字

1323. 6 和 9 组成的最大数字

package main
import "fmt"
func maximum69Number(num int) int {
    var nums []int
    for num != 0 {
        nums = append(nums, num%10)
        num = num / 10
    }
    var isReplace bool
    var res int
    for i := len(nums)-1; i >=0; i-- {
        if !isReplace && nums[i] == 6 {
            nums[i] = 9
            isReplace = true
        }
        res = res*10 + nums[i]
    }
    return res
}
func main() {
    fmt.Println(maximum69Number(669))//969
    fmt.Println(maximum69Number(9669))//9969
    fmt.Println(maximum69Number(9996))//9999
    fmt.Println(maximum69Number(9999))//9999
}