Format of files:

First line contains value of N
Second line contains value of M
Next M lines contain relationships as pairs of elements

• g_undir_disconn_unweigh_10_9.txt
• g_undir_disconn_unweigh_20_15.txt
• g_undir_disconn_unweigh_100_200.txt
• g_undir_disconn_unweigh_1000_2000.txt