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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int n,m;
- scanf("%d %d",&n,&m);
- int ara[m+1];
- for(int i=0;i<m;i++)
- {
- scanf("%d",&ara[i]);
- }
- sort(ara,ara+m);
- int ans=1005;
- for(int i=0;i<=m-n;i++)
- {
- ans=min(ans,(ara[n+i-1]-ara[i]));
- }
- printf("%d\n",ans);
- return 0;
- }
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