Compilare: user.cpp: In function ‘void add(trie*, int)’: user.cpp:41:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!nod->f[a[poz]]) ^ user.cpp:42:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->f[a[poz]] = new trie; ^ user.cpp:43:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] add(nod->f[a[poz]], poz + 1); ^ user.cpp: In function ‘void del(trie*, int)’: user.cpp:53:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] del(nod->f[a[poz]], poz + 1); ^ user.cpp: In function ‘int nrap(trie*, int)’: user.cpp:62:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] return nrap(nod->f[a[poz]], poz + 1); ^ user.cpp: In function ‘int pref(trie*, int)’: user.cpp:71:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] int val = pref(nod->f[a[poz]], poz + 1); ^