Borderou de evaluare (job #11988)

Compilare: user.cpp: In function 'int main()': user.cpp:5:13: warning: unused variable 'ck' [-Wunused-variable] user.cpp:5:16: warning: unused variable 'x' [-Wunused-variable] user.cpp:5:18: warning: unused variable 'mut' [-Wunused-variable] user.cpp:3:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:4:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:6:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]