Submission #673588

#	Time	Username	Problem	Language	Result	Execution time	Memory
673588		tbzard	Combo (IOI18_combo)	C++14	100 / 100	35 ms	572 KiB

combo

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

int press(string s);
string guess_sequence(int n){
    string ans = "";
    string s[4] = {"A", "B", "X", "Y"};

    int sum = press(s[0]+s[1]);
    if(sum == 0){
        sum = press(s[2]);
        if(sum == 1) ans += s[2], swap(s[2], s[3]);
        else ans += s[3];
    }
    else if(sum == 1){
        sum = press(s[0]);
        if(sum == 1) ans += s[0], swap(s[0], s[3]);
        else ans += s[1], swap(s[1], s[3]);
    }
    else{
        ans += s[0]+s[1];
        swap(s[0], s[3]);
    }
    while((int)ans.length() != n){
        int m = ans.length();
        if(m+1 == n){
            sum = press(ans+s[0] + ans+s[1]);
            if(sum != n) ans += s[2];
            else{
                sum = press(ans+s[0]);
                if(sum == n) ans += s[0];
                else ans += s[1];
            }
        }
        else{
            sum = press(ans+s[0] + ans+s[1]+s[0] + ans+s[1]+s[1] + ans+s[1]+s[2]);
            if(sum == m+1) ans += s[0];
            else if(sum == m+2) ans += s[1];
            else ans += s[2];
        }
    }

    return ans;
}

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