Compilare: user.cpp: In function ‘int main()’: user.cpp:3:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen ("pascal.in","r",stdin); ^ user.cpp:4:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("pascal.out","w",stdout); ^ user.cpp:6:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&d); ^ user.cpp:166:23: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(x-y-z>=1&&a-b-c>=1) ^