Submission #61221

#	Time	Username	Problem	Language	Result	Execution time	Memory
61221		Kubalionzzale	Roller Coaster Railroad (IOI16_railroad)	C++14	34 / 100	143 ms	42436 KiB

railroad

#include "railroad.h"

#include <iostream>
#include <algorithm>

long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
    int n = (int) s.size();

    long long int dp[100010][20] = { 0 };
    dp[0][0] = 0;

    int val = 1 << n;

    for (int x = 1; x < val; ++x)
    {
        for (int j = 0; j < n; ++j)
        {
            dp[x][j] = 1e15;
        }
    }

    for (int x = 1; x < val; ++x)
    {
        int bitNr = __builtin_popcount(x);

        if (bitNr == 1)
        {
            for (int j = 0; j < n; ++j)
            {
                if (x & (1 << j))
                {
                    dp[x][j] = 0;
                    break;
                }
            }
        }
        else
        {
            for (int j = 0; j < n; ++j)
            {
                if (x & (1 << j))
                {
                    int newNr = x ^ (1 << j);

                    for (int k = 0; k < n; ++k)
                    {
                        if (newNr & (1 << k))
                        {
                            dp[x][j] = std::min(dp[x][j], dp[newNr][k] + std::max(0, t[k] - s[j]));
                        }
                    }
                }
            }
        }
    }
/*
    for (int x = 1; x < val; ++x)
    {
        for (int j = 0; j < n; ++j)
        {
            std::cout << x << " " << j << " " << dp[x][j] << "\n";
        }
    }
*/
    --val;
    long long int ans = 1e15;
    for (int i = 0; i < n; ++i)
    {
        ans = std::min(ans, dp[val][i]);
    }

    return ans;
}

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