Compilare: user.cpp: In constructor ‘Aho::Aho()’: user.cpp:23:52: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(this->sons, NULL, sizeof(this->sons)); ^ user.cpp: In function ‘int main()’: user.cpp:113:18: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] cin >> s + 1 >> value; ^