Submission #989954

#	Time	Username	Problem	Language	Result	Execution time	Memory
989954		Acanikolic	Combo (IOI18_combo)	C++14	0 / 100	1 ms	344 KiB

combo

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

using namespace std;

std::string guess_sequence(int N) {
    string sol;
    if(press(sol + 'A' + 'B')) {
        if(press(sol + 'A')) sol += 'A';
        else sol += 'B';
    }else {
        if(press(sol + 'X')) sol += 'X';
        else sol += 'Y';
    }
    if(N == 1) {
        return sol;
    }
    vector<char>vec;
    if(sol[0] != 'A') vec.pb('A');
    if(sol[0] != 'B') vec.pb('B');
    if(sol[0] != 'X') vec.pb('X');
    if(sol[0] != 'Y') vec.pb('Y');
    for(int i = 2; i <= N - 1; i++) {
        int X = press(sol + vec[0] + sol + vec[1] + vec[0] + sol + vec[1] + vec[1] + sol + vec[1] + vec[2]);
        int siz = (int)sol.size();
        if(X == siz + 1) {
            sol += vec[0];
        }else if(X == siz + 2) {
            sol += vec[1];
        }else {
            sol += vec[2];
        }
    }
    if(press(sol + "AB") == N) {
        if(press(sol + 'A') == N) sol += 'A';
        else sol += 'B';
    }else {
        if(press(sol + 'X') == N) sol += 'X';
        else sol += 'Y';
    }
    //cout << sol << endl;
    return sol;
}
//4 * (n - 2) + 7 = 4n - 1

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95