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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Codechef
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		// your code goes here
  10. 		int l=10000;
  11. 		int r=99999;
  12. 		int sum=24;
  13. 		System.out.println(solve(l,r,sum));
  14. 	}
  15. 	static int digitSum(int n){
  16. 	    if(n==0)return 0;
  17. 	    return (n%10)+digitSum(n/10);
  18. 	}
  19.  
  20. 	public static int solve(int l,int r,int sum){
  21. 	    int min=digitSum(l);
  22. 	    int max=digitSum(r);
  23. 	    int n=(int)Math.log10(r)+1;
  24. 	    int [][][] dp=new int[n+1][max+1][10];
  25. 	    for(int k=0;k<=9;k++){
  26. 	        dp[1][k][k]=1;
  27. 	    }
  28. 	    for(int i=2;i<=n;i++){
  29. 	        for(int j=0;j<=sum;j++){
  30. 	            for(int k=0;k<=9;k++){
  31. 	                int rem=j-k;
  32. 	                if(rem>=0){
  33. 	                    for (int m=0;m<=9;m++) {
  34. 	                        dp[i][j][k]+=dp[i-1][rem][m];
  35. 	                    }
  36. 	                }
  37. 	            }
  38. 	        }
  39. 	    }
  40. 	    int cnt=0;
  41. 	    for(int i=1;i<=9;i++){
  42. 	        cnt+=dp[n][sum][i];
  43. 	    }
  44. 	    return cnt;
  45. 	}
  46. }
  47.  
Success #stdin #stdout 0.07s 54684KB
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https://ideone.com/WKjDCb
language:
Java (HotSpot 12)
created:
5 hours ago
visibility:
public

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