Compilare: user.cpp: In function ‘int main()’: user.cpp:16:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] y[1][s[1]]=1; ^ user.cpp:20:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] y[i][s[i]]=i; ^ user.cpp:35:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr=q-y[q][a[j][k]]; ^ user.cpp:37:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] q=y[q][a[j][k]]-1; ^