今年暑假不AC

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<string.h>
int main()
{
    int n;
    while (~scanf_s("%d",&n))
    {
        if (n == 0)
            break;
        int arr[100];
        int arr1[100];
        
        for (int i=0;i<n;i++)//读取数据
        {
            
                scanf_s("%d", &arr[i]);
                scanf_s("%d", &arr1[i]);
        }
      
        int temp;
        int count;
        for (int i = 0; i < n; i++)//对结束时间进行选择排序，时间小的放前面
        {
            for (int j = i; j < n-1; j++)
            {
                if (arr1[i] > arr1[j + 1])
                {
                    temp = arr1[i];
                    arr1[i] = arr1[j + 1];
                    arr1[j + 1] = temp;
                    temp = arr[i];
                    arr[i] = arr[j + 1];
                    arr[j + 1] = temp;

                }

            }
                
        }
       
        int mintime = arr1[0];
        count = 1;
        for (int i = 1; i < n ; i++)//找到每次最小的结束时间
        {
            if (mintime <= arr[i])
            {
                mintime = arr1[i];
                count++;
            }
        }
        printf("%d\n", count);
       
    }
    return 0;
}