poj-3069

#include "stdio.h"
#include "string.h"
#include "math.h"
#include "stdlib.h"
#include <iostream>
#include <algorithm>
#include <stdlib.h>
#include <queue>

using namespace std;

int a[1010];

int main()
{
    int r ,n,i;
    while (scanf ("%d%d",&r,&n)!=EOF && (r!=-1 && n != -1) )
    {
        for (i=1;i<=n;i++)
        {
            scanf ("%d",&a[i]);
        }
        sort(a+1,a+1+n);
        i=1;
        int ans =0 ;
        while (i<=n)
        {
            int s = a[i++];//没有被覆盖最左端的点
            while (i<=n && a[i] <= s+r)
                i++;
            int p=a[i-1];
            while (i<=n && a[i] <= p+r)
                i++;

            ans ++;
        }
        printf("%d\n",ans);
    }
    return 0;
}