Compilare: user.cpp: In function ‘int sterge(nod*, int, int, char*)’: user.cpp:36:9: warning: unused variable ‘gasit’ [-Wunused-variable] int gasit=0; ^ user.cpp: In function ‘int main()’: user.cpp:81:17: warning: NULL used in arithmetic [-Wpointer-arith] while(s[0]!=NULL&&s[0]!=EOF&&s[0]!='\n') ^ user.cpp:76:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in", "r", stdin); ^ user.cpp:77:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out", "w", stdout); ^ user.cpp:79:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:102:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccgfuQMC.o: In function `main': user.cpp:(.text.startup+0x5a): warning: the `gets' function is dangerous and should not be used.