1449 수리공 항승

#include <stdio.h>
#include <algorithm>
 
using namespace std;
 
int arr[2000] = { 0 };
 
int main(){
    int n, l;
    scanf("%d %d", &n, &l);
 
    for (int i = 1; i <= n; i++) {
        scanf("%d", &arr[i]);
    }
    sort(arr, arr + n+1);
 
    int st = arr[1],len = l-1,tmp=1;
    for (int i = 2; i <= n; i++) {
        if (arr[i] - st > len) {
            st = arr[i];
            tmp++;
        }
    }
    printf("%d", tmp);
}