InterviewBit Problems   Coin Sum Infinite : Unsolved

About the Coin Sum Infinite : Unsolved category (1)
Time limit exceeded even for O(n^2) (2)
Smart tabulation to overcome MLE (1)
Don't worry if you are getting TLE (1)
At least mention the required time complexity! (1)
No proper details for limits (1)
Is this a knapsack problem (2)
Modulo is not 1e9+7 which is brutal, please take care (2)
Why input is always called A, B (2)
Memory limit exceeds in tabulation? (2)
Wrong output for the testcase (6)
This question have some problem cos it is showing wrong ans for a case like: A : (6)