Submission #284219

#	Time	Username	Problem	Language	Result	Execution time	Memory
284219		DystoriaX	Wiring (IOI17_wiring)	C++14	100 / 100	91 ms	10344 KiB

wiring

#include "wiring.h"
#include <algorithm>
#include <iostream>
#include <set>

using namespace std;

vector<pair<int, int> > v;
const long long INF = 1e17;
long long dp[200010], pref[200010];
int st[200010], en[200010];

long long min_total_length(std::vector<int> r, std::vector<int> b) {
	int n = r.size() + b.size();
	for(auto &k : r) v.emplace_back(k, 0);
	for(auto &k : b) v.emplace_back(k, 1);

	v.emplace_back(-1, -1);
	sort(v.begin(), v.end());
	
	st[1] = 1;
	for(int i = 2; i <= n; i++){
		if(v[i].second == v[i - 1].second) st[i] = st[i - 1];
		else st[i] = i;
	}

	en[n] = n;
	for(int i = n - 1; i >= 1; i--){
		if(v[i].second == v[i + 1].second) en[i] = en[i + 1];
		else en[i] = i;
	}

	for(int i = 1; i <= n; i++){
		dp[i] = INF;
		pref[i] = pref[i - 1] + v[i].first;

		if(en[i] != n) dp[i] = min(dp[i], dp[i - 1] + v[en[i] + 1].first - v[i].first);
		if(st[i] == 1) continue;
		if(st[i] == i){
			for(int k = i - 1; k >= st[i - 1]; k--){
				dp[i] = min(dp[i], dp[k - 1] + 1LL * (i - k) * v[i].first - (pref[i - 1] - pref[k - 1]));
			}
		}
		dp[i] = min(dp[i], dp[i - 1] + v[i].first - v[st[i] - 1].first);
		int len = i - st[i] + 1;
		
		if(st[i] - st[st[i] - 1] >= len) dp[i] = min(dp[i], dp[st[i] - len - 1] + (pref[i] - pref[st[i] - 1]) - (pref[st[i] - 1] - pref[st[i] - len - 1]));
		// cerr << i << " " << dp[i] << "\n";
		
	}

	return dp[n];
}

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