Compilare: main.cpp: In function 'int factor()': main.cpp:61:23: warning: array subscript has type 'char' [-Wchar-subscripts] 61 | return f[t[i++]]; | ~~~~~^ main.cpp: In function 'int main()': main.cpp:105:11: warning: array subscript has type 'char' [-Wchar-subscripts] 105 | f[c] = !f[c]; | ^ main.cpp:105:19: warning: array subscript has type 'char' [-Wchar-subscripts] 105 | f[c] = !f[c]; | ^