Compilare: main.cpp: In function 'void ins(trie*, std::__cxx11::basic_string<char>::iterator)': main.cpp:23:20: warning: array subscript has type 'char' [-Wchar-subscripts] if(nod->fiu[*it] == 0){ ^ main.cpp:25:19: warning: array subscript has type 'char' [-Wchar-subscripts] nod->fiu[*it] = new trie; ^ main.cpp:27:21: warning: array subscript has type 'char' [-Wchar-subscripts] ins(nod->fiu[*it], it + 1); ^ main.cpp: In function 'int del(trie*, std::__cxx11::basic_string<char>::iterator)': main.cpp:40:29: warning: array subscript has type 'char' [-Wchar-subscripts] int aux = del(nod->fiu[*it], it + 1); ^ main.cpp:42:24: warning: array subscript has type 'char' [-Wchar-subscripts] delete nod->fiu[*it]; ^ main.cpp:44:17: warning: array subscript has type 'char' [-Wchar-subscripts] nod->fiu[*it] = 0; ^ main.cpp: In function 'int get_occ(trie*, std::__cxx11::basic_string<char>::iterator)': main.cpp:53:20: warning: array subscript has type 'char' [-Wchar-subscripts] if(nod->fiu[*it] == 0) ^ main.cpp:55:32: warning: array subscript has type 'char' [-Wchar-subscripts] return get_occ(nod->fiu[*it], it + 1); ^ main.cpp: In function 'int get_pref(trie*, std::__cxx11::basic_string<char>::iterator, int)': main.cpp:62:20: warning: array subscript has type 'char' [-Wchar-subscripts] if(nod->fiu[*it] == 0) ^ main.cpp:64:33: warning: array subscript has type 'char' [-Wchar-subscripts] return get_pref(nod->fiu[*it], it + 1, niv + 1); ^ main.cpp: In function 'int main()': main.cpp:74:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ~~^~~~~~~~~~