Compilare: user.cpp: In function ‘void read()’: user.cpp:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:38: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:96: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:97: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘elem run()’: user.cpp:92: warning: control reaches end of non-void function /tmp/cczUJX72.o: In function `read()': user.cpp:(.text+0x4c2): warning: the `gets' function is dangerous and should not be used.