Submission #766889

#	Time	Username	Problem	Language	Result	Execution time	Memory
766889		canadavid1	Combo (IOI18_combo)	C++14	100 / 100	32 ms	608 KiB

combo

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

#define pb push_back



int press_internal(string p)
{
    //cout << p << "\n";
    return press(p);
}

string guess_sequence(int N)
{
    mt19937 rng(12345);
    string answer = "";
    string letters = "";
    int a = (press_internal("XY")>0)*2 + (press_internal("BY")>0);
    char first_letter = "ABXY"[a];
    for(auto i : "ABXY") if (i!=first_letter) letters.pb(i);
    answer.pb(first_letter);
    while(answer.size() < N-1)
    {
        string query = "";
        query += answer;
        query.pb(letters[1]);
        for(int i = 0; i < 3; i++)
        {    
            query += answer;
            query.pb(letters[2]); query.pb(letters[i]);
        }
        answer.pb(letters[press_internal(query)-answer.size()]);       
    }
    if (N == 1) return answer;
    
    answer.pb(letters[0]);
    if(press_internal(answer)==N) return answer;
    answer.pop_back();
    answer.pb(letters[1]);
    if(press_internal(answer)==N) return answer;
    answer.pop_back();
    answer.pb(letters[2]);
    return answer;
    
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:24:25: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |     while(answer.size() < N-1)
      |           ~~~~~~~~~~~~~~^~~~~

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