Compilare: main.cpp: In function 'int factor()': main.cpp:76:23: warning: array subscript has type 'char' [-Wchar-subscripts] 76 | return f[t[i++]]; | ~~~~~^ main.cpp: In function 'int main()': main.cpp:124:11: warning: array subscript has type 'char' [-Wchar-subscripts] 124 | f[c]=1-f[c]; | ^ main.cpp:124:18: warning: array subscript has type 'char' [-Wchar-subscripts] 124 | f[c]=1-f[c]; | ^