Submission #294332

#	Time	Username	Problem	Language	Result	Execution time	Memory
294332		VodkaInTheJar	Wiring (IOI17_wiring)	C++14	13 / 100	51 ms	7016 KiB

wiring

#include <bits/stdc++.h>
 
using namespace std;

const int maxn = 200003; 
const long long inf = 1e16; 


long long f(vector <int> &v1, vector <int> &v2)
{
	long long ans = 0;
	ans += 1ll * max((int)v1.size(), (int)v2.size()) * (v2[0] - v1.back());
	
	for (int i = 0; i < (int)v1.size()-1; i++)
	ans += 1ll * (v1[i+1] - v1[i]) * (i + 1);
	
	for (int i = 0; i < (int)v2.size()-1; i++)
	ans += 1ll * (v2[i+1] - v2[i]) * ((int)v2.size() - i - 1);
	
	return ans;
}

long long dp[maxn];
long long min_total_length(vector <int> r, vector <int> b)
{
	vector <pair <int, bool> > v;
	for (auto i: r)
	v.push_back({i, false});
	
	for (auto i: b)
	v.push_back({i, true});
	
	sort (v.begin(), v.end());
	
	vector <vector <int> > seg;
	vector <int> curr;
	curr.push_back(v[0].first);
	
	for (int i = 1; i < (int)v.size(); i++)
	{
		if (v[i].second != v[i-1].second)
		{
			seg.push_back(curr);
			curr.clear();
			curr.push_back(v[i].first);
		}
		
		else 
		curr.push_back(v[i].first);
	}
	
	seg.push_back(curr);
	
	dp[0] = 0;
	dp[1] = inf;
	
	for (int i = 2; i <= (int)seg.size(); i++)
	{
		dp[i] = f(seg[i-2], seg[i-1]) + dp[i-2];
		
		long long sum = 0;
		for (auto j: seg[i-1])
		sum += j - seg[i-2].back();
		
		dp[i] = min(dp[i], sum + dp[i-1]);
	}
	
	return dp[(int)seg.size()];
}

/*
int n, m;
vector <int> r, c;
int main()
{
	cin >> n >> m;
	r.resize(n);
	c.resize(m);
	
	for (int i = 0; i < n; i++)
	cin >> r[i];
	
	for (int i = 0; i < m; i++)
	cin >> c[i];
	
	cout << min_total_length(r, c) << endl; 
}
*/

• Subtask 1: 0 / 7
• Subtask 2: 13 / 13
• Subtask 3: 0 / 10
• Subtask 4: 0 / 25
• Subtask 5: 0 / 45