func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m, a[100001];     cin >> n >> m;     for (int i = 1; i <= m; i++) {       cin >> a[i];     }     sort(a + 1, a + 1 + m);     int ans = 100000000;     for (int i = 1; i <= m - n + 1; i++) {       ans = min(ans, a[i + n - 1] - a[i]);     }     cout << ans;   }   