[백준] 1475번 : 방 번호 - Java(자바)

https://www.acmicpc.net/problem/1475

import java.util.*;
public class Main {
    public static void main(String args[]) {
        Scanner s=new Scanner(System.in);
        int n=s.nextInt();
        int arr[]=new int[10];
        int count=0;
        String k=n+"";
        for(int i=0;i<k.length();i++){
            arr[n%10]++;
            n/=10;
        }
        arr[6]+=arr[9];
        arr[9]=0;
        for(int i=0;i<10;i++){
            int a=0;
            if(i==6){
                if(arr[i]%2==0) a=arr[i]/2;
                else a=(arr[i]/2)+1;
            }
            else a=arr[i];
            if(a>=count) count=a;
        }
        System.out.print(count);
    }
}