题解

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,max=0,min=100000000,t;
    cin >> n;
    int x[n];
    for (int i=0;i<n;i++){
        cin >> x[i];
    }
    for (int i=0;i<n;i++){
        cin >> t;
        if (min>=x[i]-t) min=x[i]-t;
        if (max<=x[i]+t) max=x[i]+t;
    }
    double x0;
    x0=(min+max)*1.0/2;
    printf("%.1lf",x0);
    return 0;
}