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#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
const int N = 1e5 + 10;
int n, c;
int a[N];//表示每个隔间的坐标
bool check(int len) {
//如果间距长度为 len,计算能安排下几头奶牛
int now = a[1];
int cnt = 1;//因为第一个位置需要先放一个
for (int i = 2; i <= n; i++)
if (a[i] - now >= len) {
cnt++;
now = a[i];
}
//如果能安排下的奶牛数量大于c,就是合理的,否则就是不合理的
return cnt >= c;
}
int main() {
//输入
cin >> n >> c;
for (int i = 1; i <= n; i++) cin >> a[i];
//排序
sort(a + 1, a + n + 1);
//左右边界
int l = a[1], r = a[n];
while (l < r) {
int mid = l + r + 1 >> 1;
if (check(mid)) l = mid;//距离尽可能的大,就是向右逼近
else r = mid - 1;
}
cout << l << endl;
return 0;
}