Submission #600039

#	Time	Username	Problem	Language	Result	Execution time	Memory
600039		DanShaders	Wiring (IOI17_wiring)	C++17	17 / 100	1094 ms	7048 KiB

wiring

//grader.cpp
#include "wiring.h"
#include <bits/stdc++.h>
using namespace std;

#define x first
#define y second
#define all(x) begin(x), end(x)
#define sz(x) ((int) (x).size())
using ll = long long;
using ld = long double;

const int N = 2e5 + 10;
const ll INF = 0x3f3f3f3f3f3f3f3f;

ll dp[N];

ll min_total_length(vector<int> r, vector<int> b) {
	// ll balance = sz(b) - sz(r);
	// ll ans = 0;
	// if (balance < 0) {
	// 	ans -= b[0] * balance;
	// } else {
	// 	ans -= r.back() * balance;
	// }
	// ans += accumulate(all(b), 0ll);
	// ans -= accumulate(all(r), 0ll);
	// return ans;
	vector<pair<int, int>> a;
	for (int u : r) {
		a.push_back({u, 0});
	}
	for (int u : b) {
		a.push_back({u, 1});
	}
	sort(all(a));
	fill(all(dp), +INF);
	dp[0] = 0;
	int k = sz(a);
	pair<int, int> lst = {0, 0};
	for (int i = 0; i < k; ++i) {
		if (i && a[i].y != a[i - 1].y) {
			lst = {lst.y, i};
		}
		// cout << lst.x << " " << lst.y << endl;
		if (lst.y) {
			for (int j = lst.x; j <= lst.y; ++j) {
				// cout << j << endl;
				ll balance = i + j - 2 * lst.y + 1, ans = 0;
				if (balance < 0) {
					ans -= a[lst.y].x * balance;
				} else {
					ans -= a[lst.y - 1].x * balance;
				}
				for (int h = j; h < lst.y; ++h) {
					ans -= a[h].x;
				}
				for (int h = lst.y; h <= i; ++h) {
					ans += a[h].x;
				}
				if (dp[i + 1] > ans + dp[j]) {
					dp[i + 1] = ans + dp[j];
				}
			}
		}
	}
	// for (int i = 0; i <= k; ++i) {
	// 	cout << dp[i] << " ";
	// }
	// cout << "\n";
	return dp[k];
}

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