Compilare: main.cpp: In function 'void add(std::string&, int, int, trie*)': main.cpp:34:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if (p >= x.size()) { | ~~^~~~~~~~~~~ main.cpp: In function 'void solv()': main.cpp:87:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<trie*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 87 | for (int j = 0; j < nr.size(); j++) | ~~^~~~~~~~~~~ main.cpp:92:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<trie*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 92 | for (int j = 0; j < nr.size(); j++) | ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:139:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<trie*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 139 | for (int i = 0; i < nr.size(); i++) | ~~^~~~~~~~~~~