Farmer John has built a new long barn, with N (2 <= N <= 100,000) stalls. The stalls are located along a straight line at positions x1,…,xN (0 <= xi <= 1,000,000,000).
His C (2 <= C <= N) cows don’t like this barn layout and become aggressive towards each other once put into a stall. To prevent the cows from hurting each other, FJ want to assign the cows to the stalls, such that the minimum distance between any two of them is as large as possible. What is the largest minimum distance?
Input
-
Line 1: Two space-separated integers: N and C
-
Lines 2…N+1: Line i+1 contains an integer stall location, xi
Output
- Line 1: One integer: the largest minimum distance
Sample Input
5 3
1
2
8
4
9
Sample Output
3
不得不说英文题真的非常……（此处省略好多字），这个题也是不明白什么意思吧。现在再看一下。
母牛很好斗，
