Compilare: main.cpp: In function 'int factor()': main.cpp:72:24: warning: array subscript has type 'char' [-Wchar-subscripts] 72 | return f[ t[i++] ]; | ~~~~~^ main.cpp: In function 'int main()': main.cpp:125:14: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] 125 | t[z+1] = NULL; | ^~~~ main.cpp:132:11: warning: array subscript has type 'char' [-Wchar-subscripts] 132 | f[x] = 1 - f[x]; | ^ main.cpp:132:22: warning: array subscript has type 'char' [-Wchar-subscripts] 132 | f[x] = 1 - f[x]; | ^