Eroare de compilare: /usr/include/stdio.h: In function ‘int main()’: /usr/include/stdio.h:255: error: too few arguments to function ‘FILE* freopen(const char*, const char*, FILE*)’ user.cpp:8: error: at this point in file user.cpp:6: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:7: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result