Submission #987142

#	Time	Username	Problem	Language	Result	Execution time	Memory
987142		LucaIlie	Combo (IOI18_combo)	C++17	100 / 100	16 ms	1960 KiB

combo

#include "combo.h"
#include <iostream>

using namespace std;

char ch[4] = {'A', 'B', 'X', 'Y' };
char alf[3];
string s, g;
string guess_sequence( int n ) {
    int coins, i, first_letter = -1, j, verific;
    if( n == 1 ) {
        for( i = 0; i < 3; i++ ) {
            s = ch[i];
            if( press(s) == 1 )
                first_letter = i;
        }
        if( first_letter == -1 )
            first_letter = 3;
        s = ch[first_letter];
        return s;
    }
    g = "AB";
    coins = press( g );
    if( coins == 0 ) {
        g = 'X';
        coins = press( g );
        if( coins == 0 )
            first_letter = 3;
        else
            first_letter = 2;
    } else {
        g = 'A';
        coins = press( g );
        if( coins == 0 )
            first_letter = 1;
        else
            first_letter = 0;
    }
    //cout << first_letter;
    j = 0;
    for( i = 0; i < 4; i++ ) {
        if( i != first_letter ) {
            alf[j] = ch[i];
            j++;
        }
    }

    s = ch[first_letter];
    for( i = 1; i < n - 1; i++ ) {
        //cout << s << "\n";
        g = s + alf[0] + alf[0] + s + alf[0] + alf[1] + s + alf[0] + alf[2] + s + alf[1];
        coins = press( g );
        if( coins == i + 2 )
            s = s + alf[0];
        else if( coins == i + 1 )
            s = s + alf[1];
        else
            s = s + alf[2];
    }
    for ( i = 0; i < 2; i++ ) {
        if ( press(s + alf[i] ) == n) {
            s = s + alf[i];
            break;
        }
    }
    if ( s.size() < n )
        s = s + alf[2];
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:66:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   66 |     if ( s.size() < n )
      |          ~~~~~~~~~^~~
combo.cpp:10:41: warning: unused variable 'verific' [-Wunused-variable]
   10 |     int coins, i, first_letter = -1, j, verific;
      |                                         ^~~~~~~

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