Eroare de compilare: user.cpp: In function ‘void trie_query(T_NODE*, int)’: user.cpp:50:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] res[++l]=son+48; ^ user.cpp: In function ‘int main()’: user.cpp:104:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] res[++l]='\0'; ^ user.cpp:4:14: error: ‘fout’ was not declared in this scope #define cout fout ^ user.cpp:105:13: note: in expansion of macro ‘cout’ cout<<res<<'\n'; ^ user.cpp:80:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nums.in","r",stdin); ^ user.cpp:81:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nums.out","w",stdout); ^