Submission #807100

#	Time	Username	Problem	Language	Result	Execution time	Memory
807100		wortelworm	Cave (IOI13_cave)	C++17	100 / 100	655 ms	460 KiB

cave

#include <bits/stdc++.h>

#include "cave.h"
// #include "grader.c"

using namespace std;


void exploreCave(int N) {
    vector<bool> do_not_change(N);
    int answers[N] = {};
    int state[N] = {};
    for (int door = 0; door < N; door++)
    {
        int lever_number = 0;

        // either (true -> open) or (false -> open)
        bool open_state;
        for (int i = 0; i < N; i++) {
            if (do_not_change[i]) {
                continue;
            }

            state[i] = true;
        }
        {
            int dist = tryCombination(state);
            open_state = (dist == -1) || dist > door;
        }

        // loop over every bit in the number of the levers
        for (int i = 4096; i > 0; i /= 2) {
        // for (int i = 2; i > 0; i /= 2) {
            
            // set the levers like this
            for (int j = 0; j < N; j++) {
                if (do_not_change[j]) {
                    continue;
                }

                state[j] = (((j & i) == 0) xor (open_state)) ? 1 : 0;
            }
            
            int dist = tryCombination(state);
            if (dist == -1 || dist > door) {
                // success
                lever_number += i;
            }
        }

        answers[lever_number] = door;
        state[lever_number] = open_state;
        do_not_change[lever_number] = true;
    }
    
    answer(state, answers);
}

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