Compilare: main.cpp: In function 'double ans(double)': main.cpp:20:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(register int i=1;i<v.size();i++) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:31: warning: unused variable 'arietrecuta' [-Wunused-variable] double st=0,dr=2.0*PI,med,arietrecuta=1.0*(xmax-xmin)*(ymax-ymin),arie; ^~~~~~~~~~~ main.cpp:33:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rubarba.in","r",stdin); ^ main.cpp:34:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rubarba.out","w",stdout); ^ main.cpp:37:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:40:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^