Compilare: user.cpp: In function ‘void work()’: user.cpp:72: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:73: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:74: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:77: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/cc4y5PYX.o: In function `work()': user.cpp:(.text+0x218): warning: the `gets' function is dangerous and should not be used.