#include "wiring.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int,int> pi;
typedef vector<pi> pii;
typedef tuple<int,int,int> tii;
typedef vector<ll> li;
typedef vector<li> lii;
#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define LSOne(s) ((s)&(-s))
ll INF=1e18+10;
int inf=1e9+10;
ll M=1e9+7;
long long min_total_length(std::vector<int> r, std::vector<int> b) {
stack<int> ar,br;
int n=r.size();
int m=b.size();
REP(i,0,n)ar.push(r[i]);
REP(i,0,m)br.push(b[i]);
ll ans=0;
int x=r.back(),y=b[0];
while(!ar.empty()||!br.empty()){
int l=x,r=y;
if(!ar.empty()){
l=ar.top();
ar.pop();
}
if(!br.empty()){
r=br.top();
br.pop();
}
ans+=(ll)r-l;
}
return ans;
}
