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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.         int n = sc.nextInt();
  15.  
  16.         long sum = 0;
  17.         Long[] prefix = new Long[n + 1];   
  18.         prefix[0] = 0L;                  
  19.  
  20.         for (int i = 1; i <= n; i++) {
  21.             long num1 = sc.nextLong();
  22.             long num2 = sc.nextLong();
  23.             sum += (-num1 + num2 * (n));
  24.             prefix[i] = num1 - num2;
  25.         }
  26.         Arrays.sort(prefix, 1, n + 1, Collections.reverseOrder());
  27.         for (int i = 1; i <= n; i++) {
  28.             sum += (long) i * prefix[i];
  29.         }
  30.         System.out.println(sum);
  31. 		sc.close();
  32. 	}
  33. }
Success #stdin #stdout 0.15s 54672KB
comments (?)
stdin 
10
5 10
12 4
31 45
20 55
30 17
29 30
41 32
7 1
5 5
3 15
stdout 
1423
https://ideone.com/Dy5LKn
language:
Java (HotSpot 12)
created:
10 days ago
visibility:
public

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