Compilare: user.cpp: In function ‘int main()’: user.cpp:62:20: warning: unused variable ‘c’ [-Wunused-variable] char line[25], c; ^ user.cpp:63:9: warning: unused variable ‘opt’ [-Wunused-variable] int opt; ^ user.cpp: In function ‘int que(Trie*, char*)’: user.cpp:51:1: warning: control reaches end of non-void function [-Wreturn-type] } ^