Submission #1217986

#	Time	Username	Problem	Language	Result	Execution time	Memory
1217986		islam_2010	Combo (IOI18_combo)	C++20	0 / 100	19 ms	408 KiB

combo

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

int press(string s);

string guess_sequence(int n) {
    string s;
    vector<char> candidates = {'A', 'B', 'X', 'Y'};

    string first_try = "AB";
    if (press(first_try) == 1) {
        if (press("A") == 1) {
            s = "A";
            candidates = {'B', 'X', 'Y'};
        } else {
            s = "B";
            candidates = {'A', 'X', 'Y'};
        }
    } else {
        if (press("X") == 1) {
            s = "X";
            candidates = {'A', 'B', 'Y'};
        } else {
            s = "Y";
            candidates = {'A', 'B', 'X'};
        }
    }

    while (s.size() < n) {
        bool found = false;
        for (char c : candidates) {
            int res = press(s + c);
            if (res == s.size() + 1) {
                s += c;
                found = true;
                break;
            }
        }
        if (!found && s.size() == n - 1) {
            for (char c : candidates) {
                if (press(s + c) == n) {
                    s += c;
                    break;
                }
            }
        }
    }

    return s;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95