Compilare: main.cpp: In function 'void insert(trie*, std::string)': main.cpp:70:23: 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(int i = 0 ; i < a.size() ; i++) | ~~^~~~~~~~~~ main.cpp: In function 'void mergee()': main.cpp:86:10: warning: unused variable 'path' [-Wunused-variable] 86 | bool path = 0; | ^~~~ main.cpp: In function 'int main()': main.cpp:176:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 176 | for(j = 0 ; j < sa[i].size() ; j++) | ~~^~~~~~~~~~~~~~ main.cpp:192:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 192 | for(j = 0 ; j < sb[i].size() ; j++) | ~~^~~~~~~~~~~~~~