Compilare: main.cpp: In function 'std::unordered_map<char, Code> getHuffmanCode(std::vector<CharWithFrq>*)': main.cpp:59:10: warning: variable 'cmp' set but not used [-Wunused-but-set-variable] auto cmp = [](shared_ptr<BinaryTreeNode> lhs, shared_ptr<BinaryTreeNode> rhs) ^~~ main.cpp: In function 'int main()': main.cpp:88:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:93:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &frq); ^