Please check my code i think it's working fine at my end but when i'm trying to compile it it's giving me error

[shubhulol]

#include
#include
#include
#include
using namespace std;
int main() {
int n = 0;
cin>>n;
vector v;
int val = 0;
for(int i=0;i<n;i++){
cin>>val;
v.push_back(val);
}
for(int i=0;i<n;i++){
cin>>val;
v.push_back(val);
}

sort(v.begin(),v.end());
cout<<v[v.size()/2-1];

}