题解 | 合法IP

package main

import (
	"fmt"
	"strconv"
	"strings"
)

func main() {
	var input string
	fmt.Scan(&input)

	arr := strings.Split(input, ".")
	if len(arr) != 4 {
		fmt.Printf("NO\n")
		return
	}

	for i := 0; i < 4; i++ {
		v, err := strconv.Atoi(arr[i])
		if err != nil {
			fmt.Printf("NO\n")
			return
		}
		if len(fmt.Sprintf("%v", v)) != len(arr[i]) {
			fmt.Printf("NO\n")
			return
		}
		if v < 0 || v > 255 {
			fmt.Printf("NO\n")
			return
		}
	}

	fmt.Printf("YES\n")
}