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Path with K Coins

Posted: 28 Nov, 2020
Difficulty: Hard


Try Problem

The Ultimate Ninja Ankush is playing a game where he has a grid of ‘N’ * ‘M’ size and each block of the grid has some coins. The Ultimate Ninja ankush is carrying a knapsack that can fit only ‘K’ coins, and since he is very greedy, he wants to know the number of paths where he can collect exactly ‘K’ coins. He is initially at the top-left and wants to reach bottom-right

More formally, return the number of paths whose total sum of coins is equal to ‘K’ from 0,0 to ‘N - 1’, ‘M - 1’.

Since the answer can be very large print the answer modulo 10 ^ 9 + 7.

For example

‘N’ = 3, ‘M’ = 3
‘Grid[][]’ = [[5, 2, 5],
              [3, 3, 1],
              [3, 5, 1]]
‘K’ = 14.
The answer will be 1, since There is only 1 path that is from (0,0) to (0,1) to (0,2) to (1,2) to (2,2) this is because 5 + 2 + 5 + 1 + 1 = 14
Input format:
The first line of input contains an integer ‘T’ denoting the number of test cases.

The first line of each test case contains two space-separated integers, ‘M,’ where ‘M’ is the number of rows in ‘SEATS’ and ‘N’ where ‘N’ is the number of columns in ‘GRID’.

The next ‘M’ lines of each test case contains ‘N’ space-separated integers, which denotes the number of coins at each point.

The next line of each test case contains a single integer ‘K’.
Output Format :
For each test case, You are supposed to return an integer that denotes the total number of paths with the sum of coins equal to ‘K’.
You are not required to print the expected output; it has already been taken care of. Just implement the function.
1 <= ‘T’ <= 10
1 <= ‘N’ <= 20
1 <= ‘M’ <= 20
0 <= ‘K’ <= 1000

Time Limit: 1sec.