Compilare: user.cpp: In function ‘long long int minpos(std::pair<long long int, long long int>)’: user.cpp:18:12: warning: unused variable ‘d’ [-Wunused-variable] double d=(st[1].first*x.second-st[1].second*x.first)*1.0/(x.second-st[1].second); ^ user.cpp: In function ‘int main()’: user.cpp:36:24: warning: format ‘%lld’ expects a matching ‘long long int*’ argument [-Wformat=] scanf("%lld%lld",&n); ^ user.cpp: In function ‘long long int minpos(std::pair<long long int, long long int>)’: user.cpp:19:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:34:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elmer.in","r",stdin); ^ user.cpp:35:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elmer.out","w",stdout); ^ user.cpp:36:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&n); ^ user.cpp:39:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&r[i].first,&r[i].second); ^ user.cpp:41:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&m); ^ user.cpp:46:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&w[i].first,&w[i].second); ^