Compilare: user.cpp: In function ‘int main()’: user.cpp:34:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(In); ^ user.cpp:35:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(Out); ^ user.cpp:36:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:11:13: warning: iteration 21u invokes undefined behavior [-Waggressive-loop-optimizations] if(!uz[i]) ^ user.cpp:10:5: note: containing loop for(i=2;i<=100;i++) ^