Compilare: user.cpp: In constructor ‘node::node()’: user.cpp:12: warning: suggest parentheses around assignment used as truth value user.cpp: In function ‘int main()’: user.cpp:64: warning: comparison between signed and unsigned integer expressions user.cpp:68: warning: comparison between signed and unsigned integer expressions user.cpp:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:55: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:57: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/ccGUTKsu.o: In function `main': user.cpp:(.text+0x6c6): warning: the `gets' function is dangerous and should not be used.