linux3% valgrind ./test1.out
==12395== Memcheck, a memory error detector
==12395== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==12395== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==12395== Command: ./a.out
==12395== 
Dump out graph (size = 5):
[ 0]: 1 4 3 
[ 1]: 2 0 4 
[ 2]: 4 1 
[ 3]: 0 4 
[ 4]: 2 0 1 3 

The neighbors of vertex 4 are:
2 0 1 3 

The edges in the graph are:
(0, 1) (0, 4) (0, 3) (1, 2) (1, 4) (2, 4) (3, 4) 
==12395== 
==12395== HEAP SUMMARY:
==12395==     in use at exit: 0 bytes in 0 blocks
==12395==   total heap usage: 15 allocs, 15 frees, 264 bytes allocated
==12395== 
==12395== All heap blocks were freed -- no leaks are possible
==12395== 
==12395== For counts of detected and suppressed errors, rerun with: -v
==12395== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 6 from 6)
linux3%