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Now consider if some obstacles are added to the grids. How many unique paths would there be? An obstacle and empty space are marked as 1 and 0 respectively in the grid. Examples: Input: [[0, 0, 0], [0, 1, 0], [0, 0, 0]] Output : 2 There is only one obstacle in the middle.. Solution. 1. Using Recursion. Firstly, I'll be discussing recursive approach to subset finding problem. Recursive problem is easy to visualise. Consider the given testcase [1, 2, 3]. Let solve (nums, n, subset) be the function that find subsets for array nums and number of elements n, initially called with an empty subset . So our initial call. University of Delaware.
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