Compilare: user.cpp: In function 'void Add(Trie*, int)': user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:59: warning: comparison between signed and unsigned integer expressions /tmp/ccPzep3g.o: In function `main': user.cpp:(.text+0x182): warning: the `gets' function is dangerous and should not be used.