题解 | 记数问题

package main

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

func main() {
	var n, x int
	fmt.Scan(&n, &x)
	count := 0
	for i := 1; i <= n; i++ {
		for j := 0; j < len(strconv.Itoa(i)); j++ {
			if strings.Contains(string(strconv.Itoa(i)[j]), strconv.Itoa(x)) {
				count += 1
			}
		}
	}
	fmt.Print(count)
}