#include "wiring.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
const int MAXN = 1e5+5;
const ll inf = 1e18;
map<ll, ll> dp;
int nxt[MAXN][2];
int n;
int _abs(int v) {
return v < 0 ? -v : v;
}
ll hsh(int i, int j, bool lmatch, bool rmatch) {
return (ll) 4*i*n+4*j+2*lmatch+rmatch;
}
ll make_dp(int i, int j, bool lmatch, bool rmatch, vector<int> &r, vector<int> &b) {
int cur = i;
for (int _ = 0; _ < 3; _++) cur = nxt[cur][_&1];
if (cur <= j) return inf;
cur = j;
for (int _ = 1; _ < 4; _++) cur = nxt[cur][_&1];
if (cur <= i) return inf;
int cost = _abs(r[i]-b[j]);
if (i == r.size()-1 && j == b.size()-1) {
return cost;
}
ll cur_hsh = hsh(i, j, lmatch, rmatch);
if (dp.find(cur_hsh) != dp.end()) return dp[cur_hsh];
ll ans = inf;
if (lmatch) ans = min(ans, make_dp(i+1, j, 0, rmatch, r, b));
ans = min(ans, make_dp(i+1, j, 0, 1, r, b)+cost);
if (rmatch) ans = min(ans, make_dp(i, j+1, lmatch, 0, r, b));;
ans = min(ans, make_dp(i, j+1, 1, 0, r, b)+cost);
dp[cur_hsh] = ans;
// cerr << i << ' ' << j << ' ' << lmatch << ' ' << rmatch << ' ' << ans << '\n';
return ans;
}
ll min_total_length(vector<int> r, vector<int> b) {
n = r.size()+b.size();
int i = 0;
nxt[r.size()][0] = b.size();
nxt[b.size()][1] = r.size();
for (int j = 0; j < b.size(); j++) {
while (i < r.size() && r[i] < b[j]) i++;
nxt[j][1] = i;
}
int j = 0;
for (int i = 0; i < r.size(); i++) {
while (j < b.size() && b[j] < r[i]) j++;
nxt[i][0] = j;
}
ll ans = make_dp(0, 0, 0, 0, r, b);
assert(dp.size() < 7*n);
return ans;
}
