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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13. 		Scanner sc = new Scanner(System.in);
  14. 		List<Integer> arr = new ArrayList<>(Arrays.asList(1,2,3,2,4,5));
  15. 		List<List<Integer>> pairs = new ArrayList<>();
  16.  
  17. 		pairs.add(new ArrayList<>(Arrays.asList(0,1)));
  18. 		pairs.add(new ArrayList<>(Arrays.asList(3,4)));
  19. 		pairs.add(new ArrayList<>(Arrays.asList(0,0)));
  20. 		pairs.add(new ArrayList<>(Arrays.asList(3,4)));
  21. 		System.out.println(helper(arr, pairs));
  22.  
  23. 	}
  24. 	static int helper(List<Integer> arr, List<List<Integer>> pairs){
  25. 		int n = arr.size();
  26. 		int m = pairs.size();
  27. 		List<Integer> res = new ArrayList<>();
  28. 		boolean [] mark = new boolean[n];
  29.  
  30. 		for(int i=0;i<m;i++){
  31. 			int left = pairs.get(i).get(0);
  32. 			int right = pairs.get(i).get(1);
  33. 			for(int l = left;l<=right;l++){
  34. 				mark[l] = true;
  35. 				res.add(arr.get(l));
  36. 			}
  37. 		}
  38. 		int sum = 0;
  39. 		Collections.sort(res);
  40. 		for(int i = 0;i<n;i++){
  41. 			if(!mark[i]){
  42. 				sum+= smallerCount(res,arr.get(i));
  43. 			}
  44. 		}
  45. 		return sum;
  46. 	}
  47. 	static int smallerCount(List<Integer> res, int ele){
  48. 		int low = 0;
  49. 		int high = res.size();
  50. 		while(low<high){
  51. 			int mid = low +(high-low)/2;
  52. 			if(ele > res.get(mid)){
  53. 				low = mid+1;
  54. 			} else {
  55. 				high = mid;
  56. 			}
  57. 		}
  58. 		return low;
  59. 	}
  60.  
  61. }
Success #stdin #stdout 0.1s 56560KB
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Standard input is empty
stdout 
12
https://ideone.com/T23fgN
language:
Java (HotSpot 12)
created:
1 hour ago
visibility:
public

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