Submission #57806

#	Time	Username	Problem	Language	Result	Execution time	Memory
57806		Crown	Roller Coaster Railroad (IOI16_railroad)	C++14	34 / 100	247 ms	88468 KiB

railroad

#include "railroad.h"

#include <bits/stdc++.h>
using namespace std;
#define X first
#define Y second
#define pb push_back
typedef long long ll;
typedef pair<int, int> ii;

const int maxn = 18;

ll dp[maxn][ 1<< maxn];
int n;
vector<int> s, t;

ll solve(int u, int bit)
{
	if(bit + 1 == (1<<n)) return 0;
	if(dp[u][bit] != -1) return dp[u][bit];
	ll best = 1e18;
	for(int v = 0; v< n; v++)
	{
		if(bit & (1<< v) ) continue;
		best = min(best, max(0, t[u]-s[v])+solve(v, bit | (1<<v)));
	} 
	return dp[u][bit] = best;
}
long long plan_roller_coaster(vector<int> _s, vector<int> _t)
{
	s = _s, t = _t;
	n = (int) s.size();
	ll best = 1e18;
	memset(dp, -1, sizeof dp);
	for(int i = 0; i< n; i++) best = min(best, solve(i, 1<<i));
	return best;
}

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