Q2 All Paths From Source to Target - LeetCode 797

PHOTO

Sat Apr 08 2023 16:13:47 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

class Solution {
    public List<List<Integer>> allPathsSourceTarget(int[][] graph) {
        
        /* we dont need visited in this question as input is provided uniquely*/
        
        List<List<Integer>> psf = new ArrayList<>(); //paths so far
        List<Integer> path = new ArrayList<>();        //current path

        //adding current edge
        path.add(0);

        //graph , source , destination , visited , paths so far
        dfs(graph, 0 , graph.length-1 ,psf , path);

        return psf;
    }

    public void dfs(int[][] graph , int source , int destination ,List<List<Integer>>psf ,List<Integer> path ){

        //adding path in the paths so far arraylist
        if(source == destination){
            psf.add(new ArrayList<>(path));
            return;
        }

        for(int edge : graph[source]){
            
            path.add(edge);  //adding current edge in current path
            
            //calling dfs for current edge
            dfs(graph , edge , destination , psf , path);

            //removing current edge as we explore different edges
            path.remove(path.size() - 1);
            
        }

        return;
    }   
}

https://leetcode.com/problems/all-paths-from-source-to-target/

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