Compilare: main.cpp: In function 'int factor()': main.cpp:72:24: warning: array subscript has type 'char' [-Wchar-subscripts] 72 | return fr[v[i++]]; | ~~~~~^ main.cpp: In function 'int main()': main.cpp:126:12: warning: array subscript has type 'char' [-Wchar-subscripts] 126 | fr[c]=1-fr[c]; | ^ main.cpp:126:20: warning: array subscript has type 'char' [-Wchar-subscripts] 126 | fr[c]=1-fr[c]; | ^