Submission #336601

#	Time	Username	Problem	Language	Result	Execution time	Memory
336601		ljuba	Combo (IOI18_combo)	C++17	100 / 100	48 ms	544 KiB

combo

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

using namespace std;

string guess_sequence(int n) {
    string ans;
    if(press("AB")) {
        if(press("A"))
            ans += 'A';
        else
            ans += 'B';
    } else if(press("X")) {
        ans += 'X';
    } else {
        ans += 'Y';
    }

    if(n <= 1)
        return ans;
    vector<char> kar;
    if(ans != "A")kar.push_back('A');
    if(ans != "B")kar.push_back('B');
    if(ans != "X")kar.push_back('X');
    if(ans != "Y")kar.push_back('Y');

    for(int i = 1; i < n-1; ++i) {
        string s = ans + kar[0] + ans + kar[1] + kar[0] + ans + kar[1] + kar[1] + ans + kar[1] + kar[2];
        int x = press(s);
        if(x == i) {
            ans += kar[2];
        } else if(x == i+1) {
            ans += kar[0];
        } else {
            ans += kar[1];
        }
    }

    if(press(ans+kar[0]) == n) {
        ans += kar[0];
    } else if(press(ans+kar[1]) == n) {
        ans += kar[1];
    } else {
        ans += kar[2];
    }

    return ans;
}

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