Compilare: user.cpp: In function ‘int main()’: user.cpp:8:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,p,q,nr,x1,x2,x3,y1,y2,y3; ^ user.cpp:8:19: warning: unused variable ‘nr’ [-Wunused-variable] int n,i,j,p,q,nr,x1,x2,x3,y1,y2,y3; ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("points.in","r",stdin); ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("points.out","w",stdout); ^ user.cpp:11:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:15:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&p,&q); ^