Submission #151509

#	Time	Username	Problem	Language	Result	Execution time	Memory
151509		Linca_Robert	Combo (IOI18_combo)	C++14	5 / 100	3 ms	296 KiB

combo

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

std::string guess_sequence( int N ) {
    std::string p = "";
    std::string S = "";
    char c[] = {'A', 'B', 'X', 'Y'};
    p.push_back( 'A' );
    p.push_back( 'B' );

    if( press(p) != 0 ){
        p.clear(); p.push_back( 'A' );
        if( press(p) == 1 )
            S.push_back( 'A' );
        else
            S.push_back( 'B' ), std::swap( c[0], c[1] );
    }else{
        p.clear(); p.push_back( 'X' );
        if( press(p) == 1 )
            S.push_back( 'X' ), std::swap( c[0], c[2] );
        else
            S.push_back( 'Y' ), std::swap( c[0], c[3] );
    }

    for( int i = 2; i < N; i++ ){
        p.clear();
        p.append( S ); p.push_back( c[1] );
        p.append( S ); p.push_back( c[2] ); p.push_back( c[1] );
        p.append( S ); p.push_back( c[2] ); p.push_back( c[2] );
        p.append( S ); p.push_back( c[2] ); p.push_back( c[3] );
        ///std::cout << p << "\n";
        int ans = press( p );
        if( ans == i )
            S.push_back( c[1] );
        else
            if( ans == i + 1 )
                S.push_back( c[2] );
            else
                S.push_back( c[3] );
    }

    p.clear();
    p = S;
    p.push_back( c[1] );
    if( press(p) == N ){
        S = p;
    }else{
        p.back() = c[2];
        if( press(p) == N )
            S = p;
        else
            S.push_back( c[3] );
    }

    return S;
}

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