Submission #1210074

#	Time	Username	Problem	Language	Result	Execution time	Memory
1210074		That_Salamander	Combo (IOI18_combo)	C++20	100 / 100	7 ms	484 KiB

combo

#include "combo.h"

#include <vector>
#include <iostream>

using namespace std;

char chars[] = "ABXY";

string guess_sequence(int N) {
    string curr = "";

    if (press(curr + "A" + curr + "B") >= 1) {
        if (press(curr + "A") >= 1) {
            curr += "A";
        } else {
            curr += "B";
        }
    } else {
        if (press(curr + "X") >= 1) {
            curr += "X";
        } else {
            curr += "Y";
        }
    }

    vector<char> other;

    for (int i = 0; i < 4; i++) {
        if (chars[i] != curr[0]) other.push_back(chars[i]);
    }

    for (int i = 1; i < N-1; i++) {
        string guess = curr + other[1] + curr + other[2] + other[0]  + curr + other[2] + other[1]  + curr + other[2] + other[2];
        int res = press(guess);
        if (res == i) {
            curr += other[0];
        } else if (res == i + 1) {
            curr += other[1];
        } else {
            curr += other[2];
        }
    }

    if (N > 1) {
        if (press(curr + "A" + curr + "B") >= N) {
            if (press(curr + "A") >= N) {
                curr += "A";
            } else {
                curr += "B";
            }
        } else {
            if (press(curr + "X") >= N) {
                curr += "X";
            } else {
                curr += "Y";
            }
        }
    }

    //cout << "Guessing " << curr << "\n";

    return curr;
}

/*
ABYBX
ABYBYB
ABYBYX
ABYBYY
*/

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95