Find the highest occurring digit in prime numbers in a range
Submissions: 3928   Accuracy:

18.08%

  Difficulty: Easy   Marks: 2

Given a range L to R, the task is to find the highest occurring digit in prime numbers which lie between L and R (both inclusive). If multiple digits have same highest frequency print the largest of them. If no prime number occurs between L and R, output -1.

Input:
The first line of input contains T denoting number of test cases. The only line of each test case contains two integers L and R, denoting the range.

Output:
For each test case output a single line containing the answer.

Constraints:
1<= T <= 5000
2<= L<=R <= 10^6
R-L<=10^4


Example:
Input:

2
2 10
2 20

Output:
7
1

 

Explanation:
Prime number between 2 and 20 are 2, 3, 5, 7, 11, 13, 17, 19. 1 occur maximum i.e 5 times among 0 to 9.

 

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Tanuj Yadav
Author: tanujyadav97


If you have purchased any course from GeeksforGeeks then please ask your doubt on course discussion forum. You will get quick replies from GFG Moderators there.



Need help with your code? Please use ide.geeksforgeeks.org, generate link and share the link here.

to report an issue on this page.