Compilare: user.cpp: In function ‘int solve(int)’: user.cpp:38:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] l[ok++]=f[k[z]]; ^ user.cpp:49:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] return expresie(fun[k[loc]], l[0], l[1], l[2], l[3], l[4], l[5], l[6], l[7], l[8], l[9]); ^ user.cpp: In function ‘int main()’: user.cpp:151:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[s[0]]=r; ^ user.cpp:162:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] fun[s[0]][q]=s[p]; ^