Submission #787520

#	Time	Username	Problem	Language	Result	Execution time	Memory
787520		Sohsoh84	Roller Coaster Railroad (IOI16_railroad)	C++17	0 / 100	38 ms	6752 KiB

railroad

#include "railroad.h"
#include <bits/stdc++.h>

typedef long long ll;

using namespace std;

#define all(x)		(x).begin(), (x).end()
#define debug(x)	cerr << #x << ": " << x << endl;
#define sep		' '

const ll MAXN = 1e6 + 10;
const ll INF = 1e18;

ll f[MAXN], n, m;
vector<ll> comp_vec;
ll dp[MAXN][20];

inline int ind(ll x) {
	return lower_bound(all(comp_vec), x) - comp_vec.begin() + 1;
}

ll plan_roller_coaster(vector<int> s, vector<int> t) {
	n = s.size();

	int max_t = 0;
	for (int i = 0; i < n; i++)
		if (s[i] < s[max_t])
			max_t = i;

	for (int mask = 1; mask < (1 << n); mask++) {
		vector<int> vec;
		for (int v = 0; v < n; v++)
			if (mask >> v & 1)
				vec.push_back(v);
	

		if (int(vec.size()) < 2) {
			if (vec.front() != max_t) dp[mask][vec.front()] = INF;
			continue;
		}

		for (int e : vec) {
			dp[mask][e] = INF;
			for (int e2 : vec) {
				if (e == e2) continue;
				dp[mask][e] = min(dp[mask][e], dp[mask ^ (1 << e)][e2] + max(0, t[e2] - s[e]));
			}
		}
	}

	ll ans = INF;
	for (int i = 0; i < n; i++)
		ans = min(ans, dp[(1 << n) - 1][i]);
	return ans;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 23
• Subtask 3: 0 / 30
• Subtask 4: 0 / 36