Compilare: user.cpp: In function ‘int main()’: user.cpp:22:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cufar.in","r",stdin) ; ^ user.cpp:23:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cufar.out","w",stdout) ; ^ user.cpp:25:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d" ,&p ,&n) ; ^ user.cpp:27:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d" ,&a ,&k) ; ^ user.cpp: In function ‘void ciur()’: user.cpp:12:16: warning: iteration 4998 invokes undefined behavior [-Waggressive-loop-optimizations] if (b[i] == 0){ ~~~^ user.cpp:11:20: note: within this loop for (i = 2 ; i <= NMAX ; ++ i){ ~~^~~~~~~