Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:57:6: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (v != tata) ^ user.cpp: In function ‘void readData()’: user.cpp:36:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &m); ^ user.cpp:38:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &u, &v); ^ In file included from /usr/include/string.h:642:0, from user.cpp:3: In function ‘void* memset(void*, int, size_t)’, inlined from ‘int main()’ at user.cpp:86:29: /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 (); ^ In function ‘void* memset(void*, int, size_t)’, inlined from ‘int main()’ at user.cpp:87:35: /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 (); ^ In function ‘void* memset(void*, int, size_t)’, inlined from ‘int main()’ at user.cpp:88:29: /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/ccZhLETv.o: In function `main': user.cpp:(.text.startup+0x23): warning: memset used with constant zero length parameter; this could be due to transposed parameters