Submission #1212217

#	Time	Username	Problem	Language	Result	Execution time	Memory
1212217		NValchanov	Prisoner Challenge (IOI22_prison)	C++20	38 / 100	11 ms	1608 KiB

prison

#include "prison.h"
#include <iostream>
#include <vector>

using namespace std;

vector < vector < int > > devise_strategy(int n)
{
    int lg = 1;
    int cur = 2;

    while(cur <= n)
    {
        lg++;
        cur *= 2;
    }

    vector < vector < int > > ans;

    ans.resize(3 * lg);

    for(int reads = 0; reads < 3 * lg; reads++)
    {
        ans[reads].resize(n + 1, 0);
    }

    for(int reads = 0; reads < 3 * lg; reads++)
    {
        int whole = reads / 3;
        int remainder = reads % 3;

        if(remainder == 0)
        {
            ans[reads][0] = 0; // cheta A

            for(int sees = 1; sees <= n; sees++)
            {
                int which = lg - whole - 1; 
                bool bitb = (bool)(sees & (1 << which));
                int writes = reads + bitb + 1; // pri A % 2 == 0 -> napisanoto + 1 (ostatuk 1), pri A % 2 == 1 -> napisanoto + 2 (ostatuk 2)

                ans[reads][sees] = writes;
            }
        }
        else
        {
            ans[reads][0] = 1; // cheta B

            for(int sees = 1; sees <= n; sees++)
            {
                bool bita = remainder - 1; // ostatuk na napisanoto 1 -> A % 2 == 0, pri ostatuk na napisanoto 2 -> A % 2 == 1
                int which = lg - whole - 1;
                bool bitb = (bool)(sees & (1 << which));

                if(bita < bitb) // A < B
                    ans[reads][sees] = -1;
                else if(bita > bitb) // A > B
                    ans[reads][sees] = -2;
                else // nqmame dostatuchno info
                {
                    if(whole == lg - 1)
                        ans[reads][sees] = 0;
                    else
                        ans[reads][sees] = 3 * (whole + 1); 
                }
            }
        }
    }

    return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 28 / 90