Compilare: main.cpp: In function 'void precalc()': main.cpp:12:23: warning: array subscript has type 'char' [-Wchar-subscripts] 12 | value[i] = i - '0'; | ^ main.cpp:15:23: warning: array subscript has type 'char' [-Wchar-subscripts] 15 | value[i] = i - 'A' + 10; | ^ main.cpp: In function 'int main()': main.cpp:27:64: warning: array subscript has type 'char' [-Wchar-subscripts] 27 | remainder = ((long long) remainder * b + value[ch]) % k; | ^~