Compilare: main.cpp: In function 'int main()': main.cpp:9:15: warning: array subscript has type 'char' [-Wchar-subscripts] f[v[i]]++; ^ main.cpp:10:18: warning: array subscript has type 'char' [-Wchar-subscripts] if(f[v[i]]==1)folosite++; ^ main.cpp:12:19: warning: array subscript has type 'char' [-Wchar-subscripts] f[v[p]]--; ^ main.cpp:13:22: warning: array subscript has type 'char' [-Wchar-subscripts] if(f[v[p]]==0)folosite--; ^