Submission #1084007

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084007		vladilius	Combo (IOI18_combo)	C++17	100 / 100	25 ms	2004 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second
#define ins insert

vector<string> f = {"A", "B", "X", "Y"};

string guess_sequence(int n){
    int x; string s;
    if (press("AB")){
        if (press("A")){
            x = 0; s = "A";
        }
        else {
            x = 1; s = "B";
        }
    }
    else {
        if (press("X")){
            x = 2; s = "X";
        }
        else {
            x = 3; s = "Y";
        }
    }
    
    if (n == 1) return s;
    
    f.erase(f.begin() + x);

    for (int i = 1; i < n - 1; i++){
        string p = s + f[1];
        for (int j = 0; j < 3; j++){
            p += (s + f[2] + f[j]);
        }
        int k = press(p) - (int) s.size();
        s += f[k];
    }
    
    string p = s + f[0];
    if (press(p) == n){
        s += f[0];
    }
    else {
        p = s + f[1];
        if (press(p) == n){
            s += f[1];
        }
        else {
            s += f[2];
        }
    }
    return s;
}

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