Compilare: user.cpp: In function ‘int main()’: user.cpp:22:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(R(p[i],r[i],p[j],r[j])&&V(p[i],r[i],p[j],r[j])) ^ user.cpp:17:87: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("geometry.in","r",stdin),freopen("geometry.out","w",stdout),scanf("%d",&n); ^ user.cpp:17:87: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:17:87: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:19:62: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf%lf%lf",&p[i].x,&p[i].y,&r[i].x,&r[i].y); ^