Compilare: main.cpp: In function 'void add(std::string, int, trie*)': main.cpp:25:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | if(pos==s.size()-1) | ~~~^~~~~~~~~~~~ main.cpp: In function 'int solve_dp(std::string)': main.cpp:48:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for(int i=1; i<=target.size(); ++i) | ~^~~~~~~~~~~~~~~