pat乙级1056，错了一个答案。查了其他人的发现有很多个变量是多余的.但没看出来是哪里导致错误

package pat50;

import java.util.Scanner;

public class Main56 {
public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int count = sc.nextInt();
    String[] zifu = new String[count];
    char[] ch = new char[count];
    for(int i = 0;i<count;i++){
        String str = sc.next();
        zifu[i] = str;
        ch[i] = str.charAt(0);
    }
    int[] arr = new int[count*2];
    //拼接
    int k = 0;
    for(int i = 0;i<count;i++){
        for(int j = 0;j<count;j++){
            if(i==j){
                continue;
            }
            arr[k++]=Integer.parseInt(zifu[i]+ch[j]);
        }
    }
    int sum = 0;
    for(int i = 0;i<arr.length;i++){
        //求和
        sum+=arr[i];
    }
    System.out.print(sum);
}
}