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:53: warning: comparison between signed and unsigned integer expressions /tmp/ccsqZyMK.o: In function `main': user.cpp:(.text+0x15a): warning: the `gets' function is dangerous and should not be used.