Submission #828601

#	Time	Username	Problem	Language	Result	Execution time	Memory
828601		Liudas	Prisoner Challenge (IOI22_prison)	C++17	65 / 100	18 ms	1108 KiB

prison

#include "prison.h"
#include <cmath>
#include <cassert>
#include <cstdio>
#include <string>
#include <vector>
#include <iostream>
using namespace std;
static constexpr int kNumPrisoners = 500;
vector<vector<int>> devise_strategy(int N){
    int x = 24;
    vector<vector<int>> strat(x + 1, vector<int>(N+1));
    // base 3;
    for(int i = 0; i <= x; i ++){
        if(i % 2){
            strat[i][0] = 0;
        }
        else{
            strat[i][0] = 1;
        }
        if(i == 0){
            strat[i][0] = 0;
            int bit = 7;
            for(int j = 1; j <= N; j ++){
                int bits = j % (int)pow(3, bit + 1) / (int)pow(3, bit);
                strat[i][j] = 1 + bits * 8 + bit;
            }
        }
        else if(i % 2){
            int sett = (i >= 9) + (i >= 17);
            int bit = i - 1 - sett * 8;
            for(int j = 1; j <= N; j ++){
                int bits = j % (int)pow(3, bit + 1) / (int)pow(3, bit);
                if(sett > bits){
                    strat[i][j] = -1;
                }
                else if(bits > sett){
                    strat[i][j] = -2;
                }
                else{
                    bits = j % (int)pow(3, bit) / (int)pow(3, (bit?bit-1:0));
                    strat[i][j] = bits * 8 + bit;
                }
            }
        }
        else if(i % 2 == 0){
            int sett = (i >= 9) + (i >= 17);
            int bit = i - 1 - sett * 8;
            for(int j = 1; j <= N; j ++){
                int bits = j % (int)pow(3, bit + 1) / (int)pow(3, bit);
                if(sett > bits){
                    strat[i][j] = -2;
                }
                else if(bits > sett){
                    strat[i][j] = -1;
                }
                else{
                    bits = j % (int)pow(3, bit) / (int)pow(3, (bit ? bit-1 : 0));
                    strat[i][j] = bits * 8 + bit;
                }
            }
        }
    }
    return strat;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 55 / 90