Compilare: user.cpp: In function ‘void BruteForce()’: user.cpp:104:9: warning: unused variable ‘st’ [-Wunused-variable] int st=vf,dr=2; ^ user.cpp:119:17: warning: unused variable ‘x’ [-Wunused-variable] long double x=angle(v[n],v[1],v[2]); ^ user.cpp: In function ‘int main()’: user.cpp:175:25: warning: format ‘%lf’ expects argument of type ‘double’, but argument 2 has type ‘long double’ [-Wformat=] printf("%.3lf\n",ans); ^ user.cpp:131:36: 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); ^ user.cpp:132:38: 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); ^ user.cpp:133:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:141:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].first,&v[i].second); ^