Submission #627333

#	Time	Username	Problem	Language	Result	Execution time	Memory
627333		PunnyBunny	Prisoner Challenge (IOI22_prison)	C++17	56 / 100	20 ms	1108 KiB

prison

#include "prison.h"

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

std::vector<std::vector<int>> devise_strategy(int n) {
    vector<vector<int>> res(27, vector<int>(n + 1));
    res[0][0] = 0;  // bag A
    for (int j = 1; j <= n; ++j) res[0][j] = 1 + (j >> 12 & 1);
    for (int i = 1; i <= 13; ++i) {
        int bag = i & 1;  // look bag BABA alternating
        for (int b = 0; b < 2; ++b) {
            int x = i * 2 - 1 + b;
            res[x][0] = bag;
            for (int j = 1; j <= n; ++j) {
                int c = j >> (13 - i) & 1;
                if (c < b) {
                    if (bag == 0) {  // looking A
                        res[x][j] = -1;
                    } else {
                        res[x][j] = -2;
                    }
                } else if (c > b) {
                    if (bag == 0) {
                        res[x][j] = -2;
                    } else {
                        res[x][j] = -1;
                    }
                } else if (i != 13) {
                    res[x][j] = i * 2 + 1 + (j >> (12 - i) & 1);
                }
            }
        }
    }
    return res;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 46 / 90