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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 prefix[][]=new int[n+1][27];
  19.  
  20. 		for(int i=0;i<n;i++)
  21. 		{
  22. 			int val= s.charAt(i)-'a' ;
  23. 			for(int j=0;j<26;j++)
  24. 			{
  25. 				if(j==val)
  26. 				{
  27.  
  28. 					prefix[i+1][j]=prefix[i][j]+1;
  29.  
  30. 				}
  31. 				else
  32. 				prefix[i+1][j]=prefix[i][j];
  33.  
  34. 			}
  35.  
  36. 		}
  37.  
  38.  
  39. 		int q=sc.nextInt();
  40. 		int ans=0;
  41. 		for(int i=0;i<q;i++)
  42. 		{
  43. 			int l=sc.nextInt();
  44. 			int r=sc.nextInt();
  45.  
  46.  
  47. 			int val=Math.max(l-1,0);
  48. 			for(int j=0;j<=25;j++)
  49. 			{
  50. 			    int	freq= prefix[r][j]-prefix[val][j];
  51. 				ans+=(freq*(freq+1))/2;
  52. 			}
  53. 		}
  54.  
  55. 		System.out.println(ans);
  56. 	}
  57. }
Success #stdin #stdout 0.13s 56552KB
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stdin
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aabc
2
1 2
3 4
stdout
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5
https://ideone.com/jDF0gz
language:
Java (HotSpot 12)
created:
7 hours ago
visibility:
public

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