ZOJ Problem Set - 2397 Tian Ji -- The Horse Racing

#include<iostream>
#include<cmath>
#include<algorithm>
#define REP(i,n) for(int i=0;i<(n);i++)
using namespace std;
int a[2000],b[2000],n;
int main(){
while (cin>>n,n){
REP(i,n)cin>>a[i];
REP(i,n)cin>>b[i];
sort(a,a+n);
sort(b,b+n);
int ha=0,ta=n-1,hb=0,tb=n-1,ans=0;
REP(i,n){
if (a[ha]>b[hb])ans++,ha++,hb++;
else if (a[ta]>b[tb])ans++,ta--,tb--;
else ans-=(a[ha]!=b[tb]),ha++,tb--;
}
cout<<ans*200<<endl;
}
return 0;
}