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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. 		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[] dp3 = new int[n];
  49.  
  50. 		for(int stick = 0 ; stick < n; stick++){
  51. 			int b = 0;
  52. 			for(int ip = stick ; ip >= 0; ip--){
  53. 				if(dp[ip][stick] == 1){
  54. 					b++;
  55. 				}
  56. 			}
  57. 			if(stick+1 < n){
  58. 			int rest = dpCount[stick+1][n-1];
  59. 			//count += b * y; 
  60. 			dp3[stick] = b * rest;
  61. 			}
  62. 		}
  63.  
  64. 		int[] pdpt = new int[n];
  65.  
  66. 		for(int stick = 0 ; stick < n; stick++){
  67. 			int b = 0;
  68. 			for(int ip = stick ; ip >= 0; ip--){
  69. 				if(dp[ip][stick] == 1){
  70. 					b++;
  71. 				}
  72. 			}
  73.  
  74. 			if(stick+1 < n){
  75. 			int rest = 0;
  76. 			for(int k = stick + 1; k < n; k++){
  77. 				rest += dp3[k];
  78. 			}
  79. 			pdpt[stick] = b * rest;
  80. 			}
  81. 		}
  82.  
  83. 		int ans = 0;
  84. 		for(int i : pdpt){
  85. 			ans += i;
  86. 		}
  87. 		System.out.print(ans);
  88. 	}
  89. }
Success #stdin #stdout 0.14s 56472KB
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https://ideone.com/64yowt
language:
Java (HotSpot 12)
created:
8 hours ago
visibility:
public

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