Given a directed acyclic graph(DAG) with n nodes labeled from 0 to n-1. Given edges, s and d ,count the number of ways to reach from s to d.There is a directed Edge from vertex edges[i][0] to the vertex edges[i][1].
Example:
Input: edges = {{0,1},{0,3},{1,2},{3,2}},
n = 4, s = 0, d = 2
Output: 2
Explanation: There are two ways to reach at
2 from 0. These are-
1. 0->1->2
2. 0->3->2
Your Task:
You don't need to read or print anything. Your task is to complete the function possible_paths() which takes edges, n, s and d as input parameter and returns the number of ways to reach from s to d.
Expected Time Compelxity: O(2n) Expected Space Complexity: O(n+e)
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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