Submission #199527

#	Time	Username	Problem	Language	Result	Execution time	Memory
199527		johutha	Cave (IOI13_cave)	C++14	100 / 100	1229 ms	640 KiB

cave

#include "cave.h"
#include <iostream>
#include <vector>
#include <set>

using namespace std;

void exploreCave(int n)
{
    vector<int> defined(n, -1);
    vector<int> perm(n, -1);

    int mv = tryCombination(vector<int>(n, 0).data());

    for (int i = 0; i < n; i++)
    {
        int left = n - i;
        int ft = 0;
        
        for (; left > 1;)
        {
            int op = left / 2;
            vector<int> q = defined;
            int nds = 0;

            for (int i = 0; i < n; i++)
            {
                if (q[i] == -1 && op > 0 && nds >= ft)
                {
                    nds++;
                    op--;
                    q[i] = 1;
                }
                else if (q[i] == -1)
                {
                    q[i] = 0;
                    nds++;
                }
            }

            int res = tryCombination(q.data());
            if ((res == i) == (mv == i))
            {
                ft += left / 2;
                left = left - (left / 2);
            }
            else left /= 2;
        }

        for (int j = 0; j < n; j++)
        {
            if (defined[j] == -1 && ft == 0)
            {
                defined[j] = (mv == i);
                perm[j] = i;
                // cout << "Found " << i << ": Switch " << j << " on " << (mv == i) << "\n";
                break;
            }
            if (defined[j] == -1) ft--;
        }
        vector<int> ov = defined;
        for (int i = 0; i < n; i++) if (ov[i] == -1) ov[i] = 0;
        mv = tryCombination(ov.data());
    }
    answer(defined.data(), perm.data());
}

• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24