AGGRCOW  Aggressive cows
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 wants 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
t – the number of test cases, then t test cases follows.
* Line 1: Two spaceseparated integers: N and C
* Lines 2..N+1: Line i+1 contains an integer stall location, xi
Output
For each test case output one integer: the largest minimum distance.
Example
Input:
1 5 3 1 2 8 4 9
Output:
3
Output details:
FJ can put his 3 cows in the stalls at positions 1, 4 and 8,
resulting in
a minimum distance of 3.
hide comments
kimg:
20210220 08:45:50
Man that's some god tier problem. Really helpful for beginners like me. 

akash_krish123:
20210215 14:02:30
also remember to put an endl in C++ when printing output. Wasted time debugging such an obvious thing to get an accept!! :D otherwise a very good problem to practice binary search implementation. 

spearblaze2:
20210126 05:11:06
Even with binary search method, in JAVA I got Time Limit Exceed(TLE) error. Can anyone help me?. I applied binary search on gap array. 

starky:
20210116 06:23:06
solving a question like this in one go , is just so much fun , use binary search on the largest distance space 

pawan_ks:
20210104 17:27:22
u have to binary search on max distance possible. Comparitive function will tell if that chosen d (distance) is possible or not. 

aniketakgec:
20201226 10:27:37
The largest minimum distance means ====> there are a lot of distances which you can maintain between the cows while placing them in the barn. In this problem, you just have to find the maximum among those possible distances.


codex666:
20201218 20:16:58
I have a solution but I am getting WA. It is a combination of binary search and priority queue. Does anyone have a list of tricky testcases?


aakash18:
20201209 09:05:19
One hell of a question that was. Wow !!! Really nice question on binary search. Tried it for 2 days.


abhisek_905:
20201129 05:10:49
for reference see https://www.geeksforgeeks.org/placekelementssuchthatminimumdistanceismaximized/ Last edit: 20201129 05:13:10 

satyam_656:
20201127 06:18:05
good question of binary search for beginners 
Added by:  Roman Sol 
Date:  20050216 
Time limit:  2s 
Source limit:  10000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All 
Resource:  USACO February 2005 Gold Division 