Compilare: main.cpp: In function 'int main()': main.cpp:20:33: warning: array subscript has type 'char' [-Wchar-subscripts] 20 | for(a=r,c[0]=b[0]=0;a;c[++c[0]]=char(a%10+'0'),a/=10); | ^~~~~~ main.cpp:21:23: warning: array subscript has type 'char' [-Wchar-subscripts] 21 | for(a=r+1;a;b[++b[0]]=char(a%10+'0'),a/=10); | ^~~~~~