Compilare: main.cpp: In function 'void add(std::string, int, int, int)': main.cpp:41:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for (; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:39:9: warning: unused variable 'init' [-Wunused-variable] 39 | int init = i; | ^~~~ main.cpp: In function 'int main()': main.cpp:70:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | for(j = 0; j < s.size(); j++) | ~~^~~~~~~~~~ main.cpp:78:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | for(j = 0; j < s.size(); j++) | ~~^~~~~~~~~~ main.cpp:84:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<node>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 84 | for (int i = 1; i < trie.size(); i++) | ~~^~~~~~~~~~~~~