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277. Graph – Count all paths between source and destination
Objective: Given a graph, source vertex and destination vertex. Write an algorithm to count all possible paths between source and destination.
Condition: Graph does not contain any cycle.
This problem also known as “paths between two nodes”
Example:
Approach: Use Depth First Search
 Use DFS but we cannot use visited [] to keep track of visited vertices since we need to explore all the paths. visited [] is used avoid going into cycles during iteration. (That is why we have a condition in this problem that graph does not contain cycle)
 Start from the source vertex and make a recursive call to all it adjacent vertices.
 During recursive call, if reach the destination vertex, increment the result (no of paths).
 See the code for more understanding.
Output:
No of paths between source: 0 and destination: 5 are: 3