此程序崩溃.我找不到错误

这是一个存储桶排序程序。显示"9"作为输出后，该程序崩溃。我无法识别错误。我想错误应该在创建存储桶索引时，但我无法弄清楚。

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
// Function to sort arr[] of size n using bucket sort
void bucketSort(int arr[], int n)
{
    // 1) Create n empty buckets
    vector<int> b[n];
    // 2) Put array elements in different buckets
    for (int i=0; i<n; i++)
    {
       int bi = arr[i]; // Index in bucket
       while(bi > 9){
        bi = bi / 10;
       }
       cout << bi << endl;
       b[bi].push_back(arr[i]);
    }
    // 3) Sort individual buckets
    for (int i=0; i<n; i++)
       sort(b[i].begin(), b[i].end());
    // 4) Concatenate all buckets into arr[]
    int index = 0;
    for (int i = 0; i < n; i++)
        for (int j = 0; j < b[i].size(); j++)
          arr[index++] = b[i][j];
}
/* Driver program to test above funtion */
int main()
{
    int arr[] = {97, 56, 65, 12, 65, 34};
    int n = sizeof(arr)/sizeof(arr[0]);
    bucketSort(arr, n);
    cout << "Sorted array is n";
    for (int i=0; i<n; i++)
       cout << arr[i] << " ";
    return 0;
}