Compilare: user.cpp: In function ‘int queryMaxPrefix(Trie*, char*, int)’: user.cpp:77:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ 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 ‘Trie::Trie()’ at user.cpp:16:31, inlined from ‘void insertNode(Trie*, char*)’ at user.cpp:32:22: /usr/include/i386-linux-gnu/bits/string3.h:85:70: warning: call to void* __builtin___memset_chk(void*, int, unsigned int, unsigned int) will always overflow destination buffer [enabled by default] return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest)); ^ In function ‘void* memset(void*, int, size_t)’, inlined from ‘Trie::Trie()’ at user.cpp:16:31, inlined from ‘void _Z41__static_initialization_and_destruction_0ii.constprop.3()’ at user.cpp:20:15, inlined from ‘(static initializers for /usr/include/i386-linux-gnu/bits/string3.h)’ at user.cpp:96:1: /usr/include/i386-linux-gnu/bits/string3.h:85:70: warning: call to void* __builtin___memset_chk(void*, int, unsigned int, unsigned int) will always overflow destination buffer [enabled by default] return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest)); ^