http://acm.nyist.net/JudgeOnline/problem.php?pid=71

 
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<set>
#include<iterator>
using namespace std;
int main()
{
        int t;
        scanf("%d",&t);
        int arr[310];
        while(t--)
        {
            int n,val,temp;
            scanf("%d%d",&val,&n);
            for(int i=1;i<=n;i++)
            {
                scanf("%d",arr+i);
            }
            sort(arr+1,arr+n+1);
            int sum=n;
           for(int i=1,k=n;i<k;)
           {
               if(arr[i]+arr[k]<=val)
               {
                   i++;
                   k--;
                   sum--;
               }
               else {
                k--;
               }
           }
            printf("%d\n",sum);

        }

}