Compilare: user.cpp: In function ‘int main()’: user.cpp:24:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i] >= St[St[0]]) ^ user.cpp:25:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] St[++St[0]] = s[i]; ^ user.cpp:28:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] fout << St[St[0]]; ^ user.cpp:30:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] }while(St[St[0]] == St[--St[0]]); ^ user.cpp:30:43: warning: array subscript has type ‘char’ [-Wchar-subscripts] }while(St[St[0]] == St[--St[0]]); ^ user.cpp:30:43: warning: operation on ‘St[0]’ may be undefined [-Wsequence-point] user.cpp:22:13: warning: unused variable ‘ind’ [-Wunused-variable] int ind = i; ^