It would be more elegant to define the solution for the 1x1 case as 1 rather than 0.
agree, but will leave as so, so as to not affect submitted solutions.
I disagree with the base case. A 1x1 matrix has 1 path. And, the empty matrix has no path (zero).
The first test case has been changed from 0 to 1 without rescoring past solutions.
The first test case is incorrect. The null path (starting and ending at the same place) is a solution. The 1x1 case should have 1 solution.
Back to basics 4 - Search Path
Back to basics 8 - Matrix Diagonals
Getting the row and column location from a matrix
Given a window, how many subsets of a vector sum positive
Method of Common Differences part-1
Disjunctive Normal Form
Conjunctive Normal Form
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