Compilare: user.cpp: In function 'void trie(int, int)': user.cpp:14: warning: array subscript has type 'char' user.cpp:17: warning: array subscript has type 'char' user.cpp:19: warning: array subscript has type 'char' user.cpp: In function 'void back(int, int)': user.cpp:34: warning: array subscript has type 'char' user.cpp:34: warning: array subscript has type 'char' user.cpp: In function 'int main()': user.cpp:43: warning: format '%d' expects type 'int*', but argument 2 has type 'long int*' user.cpp:57: warning: format '%d' expects type 'int*', but argument 2 has type 'long int*' user.cpp:97: warning: format '%d' expects type 'int', but argument 2 has type 'long int'