From 840ea1e3154910e38892d689335ee9837fb1db26 Mon Sep 17 00:00:00 2001
From: Krishna Pal Deora <47516664+krishnapalS@users.noreply.github.com>
Date: Sun, 11 Oct 2020 17:47:05 +0530
Subject: [PATCH] aggressive cows c++ code implementation

---
 Aggressive_Cows/Aggressive_Cows.cpp | 82 +++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Aggressive_Cows/Aggressive_Cows.cpp

diff --git a/Aggressive_Cows/Aggressive_Cows.cpp b/Aggressive_Cows/Aggressive_Cows.cpp
new file mode 100644
index 0000000000..ee9f5efde1
--- /dev/null
+++ b/Aggressive_Cows/Aggressive_Cows.cpp
@@ -0,0 +1,82 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+int binarysearch(int *a,int last,int s,int e,int n,int minm)
+{
+
+	if(e<s)
+		return s;
+	int mid=(s+e)>>1;
+	if(a[mid]-last==minm)
+		return mid;
+	else if(a[mid]-last<minm)
+		return binarysearch(a,last,mid+1,e,n,minm);
+	else
+		return binarysearch(a,last,s,mid-1,n,minm);
+}
+
+bool check(int mid,int *a,int n,int c)
+{
+	int lastpos=0,till=1,i=1;
+	while(i<n)
+	{
+		int j=binarysearch(a,a[lastpos],i,n-c+till+1,n,mid);
+		if(a[j]-a[lastpos]<mid)
+			j++;
+		if(n-j-1<c-till-1)
+			return false;
+		lastpos=j;
+		++till;
+		if(till==c)
+			return true;
+		i=j+1;
+	}
+	return false;
+}
+/*
+bool checkit(int mid,int *a,int n,int c)
+{
+	int lastpos=0,till=1,i=1;
+	while(i<n)
+	{
+		if(a[i]-a[lastpos]>=mid)
+		{
+			lastpos=i;
+			if(++till==c)
+				return true;	
+		}
+		i++;
+	}
+	if(till==c)
+		return true;
+	return false;
+}
+*/
+int main()
+{
+	int t;
+	scanf("%d",&t);
+	while(t--)
+	{
+		int n,c;
+		scanf("%d%d",&n,&c);
+		int i,a[n];
+		for(i=0;i<n;i++)
+		{
+			scanf("%d",&a[i]);
+		}
+		sort(a,a+n);
+		int start=0,end=a[n-1]-a[0]+1,mid;
+		while(end-start>1)
+		{
+			mid=(start+end)>>1;
+		//	cout<<"start"<<start<<"mid"<<mid<<"end"<<end<<endl;
+			if(check(mid,a,n,c))
+				start=mid;
+			else
+				end=mid;
+		}
+		printf("%d\n",start);
+	}
+	return 0;
+}