Compilare: main.cpp: In function 'void insert(trie*, std::string)': main.cpp:32:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for (int i = 0; i < w.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'void solve2(trie*)': main.cpp:53:26: warning: iteration 12 invokes undefined behavior [-Waggressive-loop-optimizations] 53 | if (curr->child[i] != 0){ | ~~~~~~~~~~~~~^ main.cpp:51:23: note: within this loop 51 | for (int i = 1; i <= 13; i++) | ~~^~~~~