问题标题: 酷町堂：4369 布展（diff)

#include<iostream>
#include<algorithm>
#include<cstdio>
using namespace std;
int a[1100000],minn=100000;
int main(){
    //freopen("diff.in","r",stdin);
    //freopen("diff.out","w",stdout); 
    int n,k;
    cin>>n>>k;
    for(int i=1;i<=n;i++) cin>>a[i];
    sort(a+1,a+n+1);
    int i=1,j=n-k; 
    while(j<=n){
        if(minn>a[j]-a[i]){
            minn=a[j]-a[i];
        }
        i++;
        j++;
    }
    cout<<minn;































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































    //fclose(stdin);
    //fclose(stdout);

return 0;   
}