Submission #303676

#	Time	Username	Problem	Language	Result	Execution time	Memory
303676		rocks03	Combo (IOI18_combo)	C++14	100 / 100	45 ms	692 KiB

combo

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

string c[] = {"A", "B", "X", "Y"};

int press(string);

string guess_sequence(int N){
    string s = "";
    if(press(c[0] + c[1])){
        if(press(c[0])){
            s = c[0];
            swap(c[0], c[3]);
        }
        else{
            s = c[1];
            swap(c[1], c[3]);
        }
    } else if(press(c[2])){
            s = c[2];
            swap(c[2], c[3]);
    } else{
        s = c[3];
    }
    for(int i = 1; i < N; i++){
        if(i == N-1){
            if(press(s + c[0]) == N){
                s += c[0];
                break;
            }
            if(press(s + c[1]) == N){
                s += c[1];
                break;
            }
            s += c[2];
            break;
        }
        string toask = (s + c[0] + c[0]) + (s + c[0] + c[1]) + (s + c[0] + c[2]) + (s + c[1]);
        int cur = press(toask);
        if(cur == i + 2){
            s += c[0];
        } else if(cur == i + 1){
            s += c[1];
        } else if(cur == i){
            s += c[2];
        }
    }
    return s;
}

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