#include "railroad.h"
#include <bits/stdc++.h>
#define fr first
#define sc second
#define mk make_pair
#define pb push_back
#define all(s) s.begin(), s.end()
using namespace std;
int n;
long long dp[1 << 17][18], ans = 1e18;
long long plan_roller_coaster(vector <int> a, vector<int> b) {
n = a.size();
memset(dp, 0x3f3f3f3f, sizeof(dp));
for (int i = 0; i < n; i++) {
dp[1 << i][i] = 0;
}
for (int mask = 1; mask < (1 << n); mask++) {
for (int last = 0; last < n; last++) {
if ((mask>>last&1) == 0) continue;
for (int j = 0; j < n; j++) {
if (mask>>j&1) continue;
dp[mask + (1 << j)][j] = min( dp[mask + (1 << j)][j], dp[mask][last] + max(0, b[last] - a[j]) );
}
}
}
for (int i = 0; i < n; i++)
ans = min(ans, dp[(1 << n) - 1][i]);
return ans;
}
