Compilare: user.cpp: In function ‘int main()’: user.cpp:55:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("palmieri.in","r",stdin); ^ user.cpp:56:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("palmieri.out","w",stdout); ^ user.cpp:57:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&N,&A); ^ user.cpp:59:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&a[i].x,&a[i].y); ^ user.cpp: In function ‘void Calc()’: user.cpp:36:40: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(poz<=0&&a[i].x>=0)arie = (a[i].x-poz)*maxx; ^