Submission #1200462

#	Time	Username	Problem	Language	Result	Execution time	Memory
1200462		tamzid	Combo (IOI18_combo)	C++20	0 / 100	0 ms	408 KiB

combo

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

int best = 0;
string ans;
vector<char> ch{'A','B','X','Y'};

void backtrack(string p, int n, int i) {
    if (p.size() > 4 * n + 1) {
        return;
    }
    int a = press(p);
    if (a > best) {
        ans = p;
        best = a;
    }
    if (a == n) {
        return;
    }
    for (int j = 0; j < 4; ++j) {
        if (i != j) {
            backtrack(p + ch[j], n, i);
        }
    }
}

string guess_sequence(int N) {
    best = 0;
    ans = "";
    for (int i = 0; i < 4; ++i) {
        string p(1, ch[i]);
        backtrack(p, N, i);
    }
    return ans;
}

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