Submission #146585

#	Time	Username	Problem	Language	Result	Execution time	Memory
146585		karma	Combo (IOI18_combo)	C++11	100 / 100	67 ms	568 KiB

combo

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

using namespace std;

string guess_sequence(int n)
{
    string res = "";
    char c[] = {'A', 'B', 'X', 'Y'};
    if(press("AB")) {
       if(press("A")) res.pb('A');
       else res.pb('B'), swap(c[0], c[1]);
    } else {
       if(press("X")) res.pb('X'), swap(c[0], c[2]);
       else res.pb('Y'), swap(c[0], c[3]);
    }
    for(int i = 2; i < n; ++i) {
        int len = press(res + c[1] + c[1] + res + c[1] + c[2] + res + c[1] + c[3] + res + c[2]);
        if(len == i + 1) res.pb(c[1]);
        else if(len == i) res.pb(c[2]);
        else res.pb(c[3]);
    }
    if(n - 1) {
        if(press(res + c[1]) == n) res.pb(c[1]);
        else if(press(res + c[2]) == n) res.pb(c[2]);
        else res.pb(c[3]);
    }
    return res;
}

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