Compilare: user.cpp: In function ‘void bfs(int, int*)’: user.cpp:20:11: warning: unused variable ‘q’ [-Wunused-variable] nod p,q; ^ In file included from /usr/include/string.h:642:0, from /usr/include/c++/4.8/cstring:42, from user.cpp:2: In function ‘void* memset(void*, int, size_t)’, inlined from ‘void bfs(int, int*)’ at user.cpp:21:34: /usr/include/i386-linux-gnu/bits/string3.h:82:32: warning: call to ‘__warn_memset_zero_len’ declared with attribute warning: memset used with constant zero length parameter; this could be due to transposed parameters [enabled by default] __warn_memset_zero_len (); ^ /tmp/ccIfY49W.o: In function `bfs(int, int*)': user.cpp:(.text+0x10): warning: memset used with constant zero length parameter; this could be due to transposed parameters