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aggresive cows SPOJ.cpp

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+#include <iostream>
+#include <stdio.h>
+#include <algorithm>
+#include <vector>
+using namespace std;
+int v1[100002];
+int p,q;
+bool solution(int var)
+{
+int st = v1[0];
+int cow =1;
+for(int i =0;i<p;i++)
+{
+    if(v1[i]-st>=var)
+    {
+        cow++;
+        if(cow == q)
+        return true;
+      st = v1[i];
+
+    }
+}
+return false;
+}
+int binarySearch()
+{
+    int fi =0; //0 <= xi <= 1,000,000,000)
+    int la = v1[p -1];
+   // cout<<"p = "<<p<<endl;
+   // cout<<"la = "<<la<<endl;
+    while(fi<la)
+    {
+        int mid = (la+fi)/2;
+       // cout<<" mid in"<<mid <<endl;
+        if(solution(mid))
+        {
+          //  cout<<" mid sol "<<mid<<endl;
+            fi = mid+1;
+           // cout<<"fi if ="<<fi<<endl;
+        }
+        else{
+            la = mid;
+        }
+    }
+  //  cout<<"fi"<<fi<<endl;
+return fi-1;
+}
+int main()
+{
+int test ;
+cin>>test;
+while(test--)
+{
+    cin>>p>>q;
+    for(int j=0 ;j<p;j++)
+        cin>>v1[j];
+
+     sort(v1,v1+p);
+
+ printf("%d\n", binarySearch());
+
+
+
+}
+
+    return 0;
+}