Submission #705617

#	Time	Username	Problem	Language	Result	Execution time	Memory
705617		garyye	Combo (IOI18_combo)	C++14	0 / 100	0 ms	208 KiB

combo

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

using namespace std;

std::string guess_sequence(int N) {
    vector<char> c = {'A', 'B', 'X', 'Y'};

    string f = "";
    if(press("XY") > 0) {
        f = press("X") > 0 ? "X" : "Y";
    } else {
        f = press("A") > 0 ? "A" : "B";
    }

    c.erase(find(c.begin(), c.end(), f[0]));

   // A.   -> 1
   // BA.  -> 2
   // BB.  -> 2
   // BC.  -> 2


   // B. -> 1
   // CA -> 2
   // CB -> 2
    for(int i = 1; i < N - 1; ++i) {
        string s = "";
        s += f + c[0];
        s += f + c[1] + c[0];
        s += f + c[1] + c[1];
        s += f + c[1] + c[2];
        int g = press(s) == 0;
        if(g == 0) f += c[2];
        if(g == 1) f += c[0];
        if(g == 2) f += c[1];
    }

    // 2 + (N - 2) calls done
    if(press(f + c[0]) == N)  return f + c[0];
    if(press(f + c[1]) == N)  return f + c[1];
    return f + c[2];
}

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