Commands:

g++ -std=c++11 main.cpp -o prog
./prog < Examples/graph1.txt

Graphs are given in .txt files as in /Examples.
First number at top is the number of vertices.
Below are 2 numbers in one line, that represent an edge between vertices.
Vertex indexing starts from 0 always.

Result for graph1.txt :

Graph:
0 | 1 2
1 | 0 2
2 | 0 1 3 4
3 | 2 4
4 | 3 2 5
5 | 4
Bridges:
0 2
1 2
2 3
2 4
3 4

0 | 1 2 - what other vertices 0 is connected to with an edge