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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. 	int[] arr = {5, 4, 3, 2, 11, 12};
  13.         int n = arr.length;
  14.  
  15.         int[] prefix = new int[n+1];
  16.  
  17.         for (int i = 0; i < n; i++) {
  18.             if (i > 0 && arr[i] < arr[i-1])
  19.                 prefix[i] = prefix[i-1] + 1;
  20.             else
  21.                 prefix[i] = 1;
  22.         }
  23.  
  24.         int[] suffix = new int[n];
  25.         for (int i = n-1; i >= 0; i--) {
  26.             if (i < n - 1 && arr[i] < arr[i+1])
  27.                 suffix[i] = suffix[i+1] + 1;
  28.             else
  29.                 suffix[i] = 1;
  30.         }
  31.  
  32.         int valleys = 0;
  33.         for (int i = 0; i < n; i++) {
  34.             if (prefix[i] > 1 && suffix[i] > 1) {
  35.                 valleys += (prefix[i] - 1) * (suffix[i] - 1);
  36.             }
  37.         }
  38.  
  39.         System.out.println(valleys);
  40. 	}
  41. }
Success #stdin #stdout 0.09s 52632KB
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https://ideone.com/ZVaqDU
language:
Java (HotSpot 12)
created:
24 days ago
visibility:
public

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