Given N and E, the number of nodes and edges in a directed graph. The task is to do Breadth First Search of this graph.

The first line of input contains the number of test cases T. For each test case, the first line of input contains N and E separated by space, and next line contains 2*N numbers (N pairs as X Y) are given in the next line which represents an edge from X to Y.

For each testcase, print the BFS of the graph starting from 0.

Note: The expected output button always produces BFS starting from node 0.

User Task:
Since, this is a functional problem, your task is to complete the function bfs() which do BFS of the given graph starting from node 0 and prints the nodes in BFS order.

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


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

0 1 2 3 4    // BFS from node 0
0 1 2

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


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

Author: Shubham Joshi 1

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