Compilare: user.cpp: In function ‘char get(char, int)’: user.cpp:11:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (char i=0;i<26;++i) if (i!=a && s[i]) {b=i;break;} ^ user.cpp:12:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (char i=b+1;i<26;++i) if (a != i && s[i] >=n / 2 + 1) {b=i;break;} ^ user.cpp:13:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] --s[b]; ^ user.cpp: In function ‘int main()’: user.cpp:12:19: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (char i=b+1;i<26;++i) if (a != i && s[i] >=n / 2 + 1) {b=i;break;} ^ user.cpp:10:10: note: ‘b’ was declared here char b; ^