Compilare: main.cpp: In function 'void Add_TRIE(std::string, int, nod_TRIE*)': main.cpp:41:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | if(i==S.length()) {nod->is_last_leter++; return;} | ~^~~~~~~~~~~~ main.cpp: In function 'int Delete_TRIE(std::string, int, nod_TRIE*)': main.cpp:53:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | if(i==S.length()) nod->is_last_leter--; | ~^~~~~~~~~~~~ main.cpp: In function 'int How_manny(std::string, int, nod_TRIE*)': main.cpp:100:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 100 | if(i==S.length()) return nod->is_last_leter; | ~^~~~~~~~~~~~ main.cpp: In function 'int Longest_Prefix(std::string, int, nod_TRIE*, int)': main.cpp:109:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | if(i==S.length() || nod->next_leter[ S[i]-'a' ]==0) return k; | ~^~~~~~~~~~~~