输油管道问题

#include<bits/stdc++.h>

using namespace std;

int y[10001];

int n;

int main()

{
cin>>n;
for(int i=1;i<=n;i++)cin>>y[i]>>y[i];
sort(y+1,y+n+1);
int k=(n+1)/2;
int ans=0;
for(int i=1;i<=n;i++)
if(y[i]<y[k])ans=ans+y[k]-y[i];
else ans=ans+y[i]-y[k];
cout<<ans<<endl;
return 0;

}