Given N nodes and E edges of a graph. The task is to do depth first traversal of the graph.

Note: Use recursive approach.

First line of input contains number of testcases T. For each testcase. First line of each testcase contains number of nodes and edges seperated by space and next line contains N pairs of integers (X and Y each) where X Y means an edge from X to Y.

For each testcase, print the nodes while doing DFS starting from node 0.

Your task:
The task is to complete the function dfs() which should do the depth first traversal of given graph and prints the node in DFS order.

1 <= T <= 100
1 <= N <= 200


5 4
0 1 0 2 0 3 2 4
4 3
0 1 1 2 0 3

0 1 2 4 3    // dfs from node 0
0 1 2 3

Testcase 1:
There is  one test cases.  First line of each test case represent an integer N denoting number of edges and then in the next line N pairs of values a and b are fed which denotes there is an edge from a to b.


** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Harshit Sidhwa
Author: Shubham Joshi 1

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