#include "railroad.h"
#ifndef EVAL
#include "grader.cpp"
#endif
#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define fastios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define vll vector<ll>
#define vii vector<int>
#define vpii vector<pii>
#define vpll vector<pll>
#define cnt(a)__builtin_popcount(a)
template<class T> bool umin(T& a, const T& b) {return a > b? a = b, true:false;}
template<class T> bool umax(T& a, const T& b) {return a < b? a = b, true:false;}
const ll inf = 1e18+7;
const int N = 2e5+5;
vii s, t;
int n;
ll dp[(1<<16)][16];
long long plan_roller_coaster(vector<int> S, vector<int> T) {
n = sz(S);
s.resize(n);
t.resize(n);
for(int i=0;i<n;i++) s[i] = S[i];
for(int i=0;i<n;i++) t[i] = T[i];
for(int i=0;i<(1<<n);i++){
for(int j=0;j<n;j++) dp[i][j] = inf;
}
for(int i=0;i<n;i++){
dp[(1<<i)][i] = 0;
}
for(int i=0;i<(1<<n);i++){
for(int j=0;j<n;j++){
if(i>>j & 1){
ll tt = (i ^ (1<<j));
for(int l=0;l<n;l++){
if(tt >> l & 1)
dp[i][j] = min(dp[i][j], dp[tt][l] + (t[l] < s[j] ? 0:t[l] - s[j]));
}
}
}
}
ll mn = inf;
for(int i=0;i<n;i++){
umin(mn, dp[(1<<n)-1][i]);
}
return mn;
}
/*
4
1 7
4 3
5 8
6 6
*/
