fork download
copy 
  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. 		String s = sc.next();
  15.  
  16. 		int n = s.length();
  17.  
  18. 		int[][] dpCount = new int[n][n];
  19. 		int[][] dp = new int[n][n];
  20.  
  21. 		for(int i = 0; i < n; i++){
  22. 			dp[i][i] = 1;
  23. 			dpCount[i][i] = 1;
  24. 		}
  25.  
  26. 		for(int i = 0; i < n-1; i++){
  27. 			if(s.charAt(i) == s.charAt(i+1)){
  28. 			dp[i][i+1] = 1;
  29. 			dpCount[i][i+1] = 3;
  30. 			}else{
  31. 				dpCount[i][i+1] = 2;
  32. 			}
  33. 		}
  34.  
  35. 		for(int len = 3; len <= n; len++){
  36. 			for(int i = 0 ; i <= n - len; i++){
  37. 				int j = i + len - 1;
  38.  
  39. 				dpCount[i][j] = dpCount[i][j-1] + dpCount[i+1][j] - dpCount[i+1][j-1];
  40.  
  41. 				if(s.charAt(i) == s.charAt(j) && dp[i+1][j-1] == 1){
  42. 					dp[i][j] = 1;
  43. 					dpCount[i][j] += 1; 
  44. 				}
  45. 			}
  46. 		}		
  47.  
  48. 		int stick = 0;
  49. 		int count = 0;
  50.  
  51. 		while(stick < n - 1){
  52. 			int b = 0;
  53. 			for(int ip = stick ; ip >= 0; ip--){
  54. 				if(dp[ip][stick] == 1){
  55. 					b++;
  56. 				}
  57. 			}
  58. 			int y = dpCount[stick+1][n-1];
  59. 			count += b * y; 
  60. 			stick++;
  61. 		}
  62. 		System.out.print(count);
  63. 	}
  64. }
Success #stdin #stdout 0.17s 54476KB
comments (?)
stdin
copy 
abaabb
stdout
copy 
30
https://ideone.com/tYdmqv
language:
Java (HotSpot 12)
created:
11 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!