Compilare: user.cpp: In function ‘void back(int, int)’: user.cpp:28:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(f[i]==0) ^ user.cpp:30:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[i]=1; ^ user.cpp:31:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(tt+d[l[pz]][l[i]]<=mn) ^ user.cpp:31:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(tt+d[l[pz]][l[i]]<=mn) ^ user.cpp:31:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(tt+d[l[pz]][l[i]]<=mn) ^ user.cpp:32:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] back(pz+1, tt+d[l[pz]][l[i]]); ^ user.cpp:32:43: warning: array subscript has type ‘char’ [-Wchar-subscripts] back(pz+1, tt+d[l[pz]][l[i]]); ^ user.cpp:32:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] back(pz+1, tt+d[l[pz]][l[i]]); ^ user.cpp:33:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[i]=0; ^ user.cpp: In function ‘int main()’: user.cpp:70:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] back(1, d[l[1]][l[3]]); ^ user.cpp:70:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] back(1, d[l[1]][l[3]]); ^