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- #include <bits/stdc++.h>
- using namespace std;
- int n, m, mn = 0x3f3f3f3f;
- vector<int> v;
- int main(){
- cin >> n >> m;
- v.resize(m);
- for(int i = 0; i < m; i++) cin >> v[i];
- sort(v.begin(), v.end());
- for(int i = 0; i + n <= m; i++) mn = min(mn, v[n+i-1] - v[i]);
- cout << mn << endl;
- }
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