#include "railroad.h"
#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
using namespace std;
#define X first
#define Y second
#define pb push_back
typedef pair<int, int> ii;
typedef long long ll;
const int maxn = 18;
int dp[maxn][1<<maxn];
int n;
int s[maxn], t[maxn];
ll solve(int u, int bit)
{
if(bit == (1<<n)-1) return 0;
if(dp[u][bit] != -1) return dp[u][bit];
ll best = 1e18;
for(int i = 0; i< n; i++)
{
if(bit&(1<<i)) continue;
best = min(best, (t[u]<= s[i]?0:t[u]-s[i])+solve(i, bit|(1<<i)));
}
return dp[u][bit] = best;
}
ll plan_roller_coaster(vector<int> S, vector<int> T)
{
memset(dp, -1, sizeof dp);
n = S.size();
for(int i = 0; i< n; i++)
{
s[i] = S[i];
t[i] = T[i];
}
ll best = 1e18;
for(int i = 0; i< n; i++) best = min(best, solve(i, 1<<i));
return best;
}
