Compilare: main.cpp: In function 'void ins(trie*, char*, int)': main.cpp:25:15: warning: array subscript has type 'char' [-Wchar-subscripts] 25 | if(p->fiu[*s] != 0) | ^~ main.cpp:27:20: warning: array subscript has type 'char' [-Wchar-subscripts] 27 | ins(p->fiu[*s],s+1,r); | ^~ main.cpp:30:12: warning: array subscript has type 'char' [-Wchar-subscripts] 30 | p->fiu[*s]= new trie; | ^~ main.cpp:31:16: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | ins(p->fiu[*s],s+1,r); | ^~ main.cpp: In function 'std::string tostr(int)': main.cpp:52:12: warning: array subscript has type 'char' [-Wchar-subscripts] 52 | t[k--]=x%2; | ~^~ main.cpp: In function 'int main()': main.cpp:86:25: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses] 86 | if(pf[i]^pf[l1] > mx) | ~~~~~~~^~~~