#include using namespace std; typedef signed long long ll; #undef _P #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define FORR2(x,y,arr) for(auto& [x,y]:arr) #define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) //------------------------------------------------------- int N; ll A[202020],B[202020]; double hoge(double v) { double ret=0; int i; FOR(i,N) ret+=B[i]*abs(v-A[i]); return ret; } void solve() { int i,j,k,l,r,x,y; string s; cin>>N; FOR(i,N) cin>>A[i]; FOR(i,N) cin>>B[i]; double L=-1<<30,R=1<<30; FOR(i,60) { double m1=(2*L+R)/3; double m2=(2*R+L)/3; double v1=hoge(m1); double v2=hoge(m2); if(v1<=v2) R=m2; if(v2<=v1) L=m1; } cout<