Submission #233795

#	Time	Username	Problem	Language	Result	Execution time	Memory
233795		Toirov_Sadi	Combo (IOI18_combo)	C++17	100 / 100	42 ms	688 KiB

combo

#include<bits/stdc++.h>
#include "combo.h"

using namespace std;

string guess_sequence(int N){

    string res = "A";

    vector<char> a = {'B', 'X', 'Y'};
    if(press("AB")){
        if(press("B")) res = "B", a = {'A', 'X', 'Y'};
    }
    else{
        if(press("X")) res = "X", a = {'A', 'B', 'Y'};
        else res = "Y", a = {'A', 'B', 'X'};
    }

    for(int i = 1; i < N - 1; i ++){

        string t;
        t += (res + a[0]);

        t += (res + a[1] + a[0]);
        t += (res + a[1] + a[1]);
        t += (res + a[1] + a[2]);

        int x = press(t);
        int sz = (int)res.size();

        if(x == sz + 1) res += a[0];
        else if(x == sz + 2) res += a[1];
        else res += a[2];
    }
    if(N > 1){
        string t;
        t += res + a[0];
        t += res + a[1];
        if(press(t) == N){
            t = res + a[0];
            if(press(t) == N) res += a[0];
            else res += a[1];
        }
        else{
            res += a[2];
        }
    }
    return res;
}

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