SPOJ Problem:- AMR10G - Christmas Play Solution 


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    //NAME:- ANUHAR TRIPATHI
    //COLLEGE:- JAYPEE UNIVERSITY OF ENGINEERING & TECHNOLOGY, GUNA
    //EMAIL:- anuhartripathi15@gmail.com
    //SPOJ Problem:-  AMR10G - Christmas Play
    #include<bits/stdc++.h>
    #define ll long long
    using namespace std;
    int main()
    {
        ll t;
        cin>>t;
        while(t--)
        {
            ll n,k;
            cin>>n>>k;
            ll h[n],i,j,mi=LONG_MAX;
            for(i=0;i<n;i++)
            cin>>h[i];
            sort(h,h+n);
            j=0;                
            for(i=k-1;i<n;i++)
            {
                if(mi>h[i]-h[j])
                mi=h[i]-h[j];
                ++j;
            }
            cout<<mi<<"\n";
        }
        return 0;
    }

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