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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. bool check(int cows,long long int positions[],int n,long long int distance){
  4.     int count = 1;
  5. 	long long last_position = positions[0];
  6.  
  7. 	for(int i=1;i<n;i++){
  8. 		if(positions[i] - last_position >= distance){
  9. 			last_position = positions[i];
  10. 			count++;
  11. 		}
  12.  
  13. 		if(count == cows){
  14. 			return true;
  15. 		}
  16. 	}
  17. 	return false;
  18. }
  19. int main() {
  20.  
  21. 	int t;
  22.     cin>>t;
  23.     while(t--){
  24.         int n,c;
  25.         cin>>n>>c;
  26.         long long int positions[n];
  27.         for(int i=0;i<n;i++){
  28.             cin>>positions[i];
  29.         }
  30.         sort(positions,positions+n);
  31.         long long int start = 0;
  32.         long long int end = positions[n-1]-positions[0];
  33.         long long int ans = -1;
  34.         while(start<=end){
  35.             long long int mid = start + (end-start)/2;
  36.             if(check(c,positions,n,mid)){
  37.                 ans = mid;
  38.                 start = mid+1;
  39.             }else{
  40.                 end = mid - 1;
  41.             }
  42.         }
  43.         cout<<ans<<endl;
  44.     }
  45. 	return 0;
  46.  
  47. }
Success #stdin #stdout 0s 4220KB
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stdout 
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https://ideone.com/WD5UPe
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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