Holi and Friendship
Practice
4.5 (2 votes)
Dynamic programming
Digit dp
Algorithms
Medium Hard
Digit dp
Advanced
Problem
48% Success 905 Attempts 50 Points 3s Time Limit 512MB Memory 1024 KB Max Code
Monk believes in relaxing and playing number games in Holi. Monk's friend defined a Holi function H such that \(H(x)\) = sum of digits of number x. Monk is given a question where he will be given a number N and he wants to find the count of number of pairs (x,y) such that the following conditions hold true:
- \(0 \le x < y \le N \)
- \( H(x) < H(y) \)
- \( H(x)+H(y) \) is prime
\(Constraints\)
\(1\le N \le 10 ^ {50} \)
\(Input Format \)
First line contains N.
\(Output Format\)
Print the number of pairs modulo 10^9 +7.
Explanation
The pairs are (0,2) and (1,2).
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