Problem Description Gary being the smartest guy in the town is a friend of you. He challenges you with an interesting problem. He gives you a number A and asks you to find the number of "actual" greater pairs till A. An actual greater pair(a, b) means that it should hold following conditions • 0 <=a

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Problem Description Gary being the smartest guy in the town is a friend of you. He challenges you with an interesting problem. He gives you a number A and asks you to find the number of "actual" greater pairs till A. An actual greater pair(a, b) means that it should hold following conditions • 0 <=a<b<= n • Sum of digits of a < Sum of digits of b The number A is given you in form of a string as it can be very huge! Return the number of actual greater pairs with above conditions modulo 1e9+7. Problem Constraints 1 <= A < 10100

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