Compilare: user.cpp: In function ‘int partition(int, int)’: user.cpp:36: warning: array subscript has type ‘char’ user.cpp:36: warning: array subscript has type ‘char’ user.cpp:36: warning: array subscript has type ‘char’ user.cpp:36: warning: array subscript has type ‘char’ user.cpp: In function ‘void back(int, int, int)’: user.cpp:57: warning: unused variable ‘i’ user.cpp: In function ‘int main()’: user.cpp:137: warning: array subscript has type ‘char’ user.cpp: In function ‘int partition(int, int)’: user.cpp:42: warning: control reaches end of non-void function