This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
int n, l;
int a[12];
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>l;
    for(int i=0; i<n; i++) cin>>a[i];
    sort(a, a+n);
    int br=0;
    do
    {
        int sum=0;
        for(int i=1; i<n; i++)
        {
            sum+=max(a[i]-a[i-1], a[i-1]-a[i]);
        }
        if(sum<=l) br++;
    }while(next_permutation(a, a+n));
    cout<<br<<endl;
    return 0;
}
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