Compilare: user.cpp: In function ‘void BruteForce()’: user.cpp:104:9: warning: unused variable ‘st’ [-Wunused-variable] int st=vf,dr=2; ^ user.cpp:119:12: warning: unused variable ‘x’ [-Wunused-variable] double x=angle(v[n],v[1],v[2]); ^ user.cpp: In function ‘int main()’: user.cpp:130:36: 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:131:38: 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:132:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:135:47: 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); ^