Compilare: user.cpp: In function ‘int termen4()’: user.cpp:59:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] r=v[c[i]]; ^ user.cpp: In function ‘int main()’: user.cpp:128:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[s[j]]=!(v[s[j]]); ^ user.cpp:128:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[s[j]]=!(v[s[j]]); ^