Submission #552593

#	Time	Username	Problem	Language	Result	Execution time	Memory
552593		timreizin	Wiring (IOI17_wiring)	C++17	17 / 100	1090 ms	8468 KiB

wiring

#include "wiring.h"
#include <vector>
#include <cmath>
#include <algorithm>

using namespace std;

using ll = long long;

ll min_total_length(vector<int> r, vector<int> b)
{
    /*vector<vector<ll>> dp(r.size(), vector<ll>(b.size()));
    for (int i = 0; i < b.size(); ++i)
    {
        dp[0][i] = abs(r[0] - b[i]);
        if (i != 0) dp[0][i] += dp[0][i - 1];
    }
    for (int i = 1; i < r.size(); ++i)
    {
        for (int j = 0; j < b.size(); ++j)
        {
            dp[i][j] = dp[i - 1][j] + abs(r[i] - b[j]);
            if (j != 0)
            {
                dp[i][j] = min({dp[i][j], dp[i][j - 1] + abs(r[i] - b[j]),
                                dp[i - 1][j - 1] + abs(r[i] - b[j])});
            }
        }
    }
	return dp.back().back();*/
    vector<pair<ll, bool>> points;
    for (int i : r) points.emplace_back(i, 0);
    for (int i : b) points.emplace_back(i, 1);
    sort(points.begin(), points.end());
    int n = points.size();
    vector<ll> dp(n, 1e18);
    for (int i = 1; i < n; ++i)
    {
        int last;
        ll sum = 0, cnt = 1;
        for (last = i - 1; last >= 0 && points[last].second == points[i].second; --last)
        {
            sum += (points[last + 1].first - points[last].first) * (i - last);
            ++cnt;
        }
        if (last < 0) continue;
        dp[i] = dp[last] + sum + cnt * (points[last + 1].first - points[last].first);
        int st = last;
        ll sum2 = 0;
        for (; last >= 0 && points[last].second != points[i].second; --last)
        {
            sum2 += points[st].first - points[last].first;
            ll res = sum2 + sum + max(cnt, st - last + 1ll) * (points[st + 1].first - points[st].first);
            if (last > 0) res += dp[last - 1];
            dp[i] = min(dp[i], res);
        }
    }
    return dp.back();
}

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