Borderou de evaluare (job #32243)

Compilare: user.c: In function ‘main’: user.c:5:39: warning: unused variable ‘b’ [-Wunused-variable] user.c:5:27: warning: unused variable ‘s’ [-Wunused-variable] user.c:3:8: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] user.c:4:8: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] user.c:6:6: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]