Submission #1256866

#	Time	Username	Problem	Language	Result	Execution time	Memory
1256866		kawhiet	Combo (IOI18_combo)	C++20	100 / 100	7 ms	484 KiB

combo

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

string guess_sequence(int n) {
    string s;
    if (press("AB")) {
        if (press("A")) s = "A";
        else s = "B";
    }
    else {
        if (press("X")) s = "X";
        else s = "Y";
    }
    if (n == 1) {
        return s;
    }
    string a = "ABXY";
    a.erase(remove(a.begin(), a.end(), s[0]), a.end());
    while (s.size() < n - 1) {
        string p = s + a[0] + s + a[1] + a[0] + s + a[1] + a[1] + s + a[1] + a[2];
        int res = press(p) - s.size();
        if (res == 0) {
            s += a[2];
        }
        else if (res == 1) {
            s += a[0];
        }
        else {
            s += a[1];
        }
    }
    if (press(s + a[0]) == n) {
        s += a[0];
    }
    else if (press(s + a[1]) == n) {
        s += a[1];
    }
    else {
        s += a[2];
    }
    return s;
}

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