Compilare: user.cpp: In function ‘void add(std::string)’: user.cpp:31:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) { ^ user.cpp: In function ‘int add(const string&, int, int, Node*)’: user.cpp:47:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == s.size()) ^ user.cpp: In function ‘std::string get_best(std::string)’: user.cpp:64:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pat.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:80:12: warning: unused variable ‘r’ [-Wunused-variable] int n, m, r, amount; ^