Submission #825243

#	Time	Username	Problem	Language	Result	Execution time	Memory
825243		benjaminkleyn	Counting Mushrooms (IOI20_mushrooms)	C++17	0 / 100	1 ms	208 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;

int count_mushrooms(int n)
{
    int A = 1, cnt = 0;
    int i = 0;

    for (; i + 4 < n; i += 4)
    {
        int x = use_machine({i+0, i+1, i+2, i+3, i+4});

        if (x == 0)
            cnt += (A ? 4 : 0);
        else if (x == 1)
        {
            int y = use_machine({i+0, i+3, i+1, i+4, i+2});

            if (y == 1)
                cnt += (A ? 1 : 3);
            else if (y == 2)
                cnt += (A ? 4 : 0);
            else if (y == 3)
                cnt += 2;
            else if (y == 4)
                cnt += (A ? 3 : 1);
        }
        else if (x == 2)
        {
            int y = use_machine({i+1, i+0, i+2, i+4, i+3});

            if (y <= 2)
                cnt += (A ? 3 : 1);
            else if (y == 3)
                cnt += 2;
            else if (y == 4)
                cnt += (A ? 1 : 3);
                  
        }
        else if (x == 3)
        {
            int y = use_machine({i+3, i+1, i+2, i+0, i+4});

            if (y == 2)
                cnt += 2;
            else if (y == 3)
                cnt += (A ? 3 : 1);
        }
        else if (x == 4)
            cnt += 2;
        A ^= (x % 2);
    }

    cnt += A;
    for (int j = i + 1; j < n; j++)
        cnt += 1 - use_machine({0, j});

    return cnt;
}

• Subtask 1: 0 / 100