Submission #789909

#	Time	Username	Problem	Language	Result	Execution time	Memory
789909		Minindu206	Roller Coaster Railroad (IOI16_railroad)	C++14	64 / 100	78 ms	13728 KiB

railroad

#include "railroad.h"
#include <bits/stdc++.h>
using namespace std;
long long plan_roller_coaster(std::vector<int> s, std::vector<int> t)
{
#define int long long
    int n = (int)s.size();
    if (n > 16)
    {
        vector<pair<int, int>> ss, tt;
        for (int i = 0; i < n; i++)
        {
            tt.push_back({t[i], i});
            ss.push_back({s[i], i});
        }
        sort(ss.rbegin(), ss.rend());
        sort(tt.rbegin(), tt.rend());

        int i = 0, j = 1;
        while (j < n)
        {
            if (ss[i].second != tt[j].second)
            {
                if (tt[j].first > ss[i].first)
                    return 999;
            }
            else if (i != n - 1)
            {
                if (tt[j].first > ss[i + 1].first)
                    return 999;
            }

            i++, j++;
        }
        return 0;
    }
    vector<vector<int>> dp((1 << n), vector<int>(n, LLONG_MAX));
    for (int i = 0; i < n; i++)
        dp[(1 << i)][i] = 0;
    for (int i = 0; i < (1 << n); i++)
    {
        for (int j = 0; j < n; j++)
        {
            if (!((1 << j) & (i)))
                for (int k = 0; k < n; k++)
                {
                    if (((1 << k) & i))
                    {
                        int dis = max((int)(t[k] - s[j]), 0LL);
                        dp[i | (1 << j)][j] = min(dp[i][k] + dis, dp[i | (1 << j)][j]);
                    }
                }
        }
    }
    int ans = LLONG_MAX;
    for (int i = 0; i < n; i++)
    {
        ans = min(ans, dp[(1 << n) - 1][i]);
    }
    return ans;
}

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