搜狐 回文数组最小值 只能AC30%,求原因

	import java.util.Scanner;

public class Main1 {  public static void main(String[] args) {  Scanner sc = new Scanner(System.in);  String str0 = sc.nextLine();  int L = Integer.parseInt(str0);  String str1 = sc.nextLine();  String[] str2 = str1.split(" ");    int[] a = new int[L];  for(int i=0; i<L; i++){  a[i] = Integer.parseInt(str2[i]);  }  int res = smallestNum(a,L);  System.out.println(res);  }  private static int smallestNum(int[] a, int L) {   int sum = 0;   StringBuffer sb = new StringBuffer();  for(int i=0; i<L; i++){  sb.append(a[i]+" ");  }  int i=0;  int j=a.length-1;  while(i<j){  if(a[i] != a[j]){  int min = a[i]>a[j]?a[j]:a[i];  sb.append(min+" ");  if(a[i]<a[j]){   i++;  }else{  j--;  }  }else{    i++;  j--;  }  }  String str1 = sb.toString();   String[] str2 = str1.split(" ");   int[] b = new int[str2.length];  for(int k=0; k<str2.length; k++){  b[k] = Integer.parseInt(str2[k]);  sum += b[k];  }  return sum;    }

}