Compilare: user.cpp: In function ‘void ins(Trie*, char*, int)’: user.cpp:66:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < nod -> CH.size(); ++i) ^ user.cpp: In function ‘int Count(Trie*, char*)’: user.cpp:112:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < nod -> CH.size(); ++i) ^ user.cpp: In function ‘void Read_Text()’: user.cpp:20:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &n); ^ user.cpp:23:18: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(aux); ^ user.cpp: In function ‘void Query()’: user.cpp:128:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(aux, 20, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:136:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(scanf("%d ", &m); m; --m) ^ /tmp/ccVASHpe.o: In function `Read_Text()': user.cpp:(.text+0x3b): warning: the `gets' function is dangerous and should not be used.