3450 字符串交换

#include <stdio.h>
#include <string.h>

int main()
{
    char arr1[20];
    int i = 0,j=0;

    scanf("%s", &arr1);
    int sz = strlen(arr1);

    int arr2[20];
    for (i = 0; i < sz; i++)
    {
        arr2[i] = arr1[i];
    }

    for(j=sz-1;j>0;j--)
    {
        for (i = 0; i < j; i++)
        {
            if (arr2[i] > arr2[i + 1])
            {
                int temp = arr2[i];
                arr2[i] = arr2[i + 1];
                arr2[i + 1] = temp;
            }
        }
    }
    for (i = 0; i < sz; i++)
    {
        arr1[i] = arr2[i];
    }
    printf("%s", arr1);

    return 0;
}