Submission #213173

#	Time	Username	Problem	Language	Result	Execution time	Memory
213173		_Ice_Tea_	Combo (IOI18_combo)	C++14	100 / 100	42 ms	660 KiB

combo

#include<bits/stdc++.h>

#include "combo.h"

#define de(x) if( x && x == MODE)
#define MODE 0
using namespace std;

string cht;
string dic[4];

std::string guess_sequence(int N) {

    string S;
    int i, j;

    string p;
    p = "AB";
    if( press(p) )
    {
        p = "A";
        if( press(p) )
            S = "A";
        else
            S = "B";
    }
    else
    {
        p = "X";
        if( press(p) )
            S = "X";
        else
            S = "Y";
    }

    if( N == 1)
        return S;

    if( S == "A")
    {
        dic[0] = "BB";
        dic[1] = "BX";
        dic[2] = "BY";
        dic[3] = "X";
        cht = "BXY";
    }
    else if( S == "B")
    {
        dic[0] = "AA";
        dic[1] = "AX";
        dic[2] = "AY";
        dic[3] = "X";
        cht = "AXY";
    }
    else if( S == "X")
    {
        dic[0] = "AA";
        dic[1] = "AB";
        dic[2] = "AY";
        dic[3] = "B";
        cht = "ABY";
    }
    else if( S == "Y")
    {
        dic[0] = "AA";
        dic[1] = "AB";
        dic[2] = "AX";
        dic[3] = "B";
        cht = "ABX";
    }

    for( i=1; i<N-1; i++)
    {
        p = S + dic[0] + S + dic[1] + S + dic[2] + S + dic[3];
        de(1) cout<<"ask>> "<<p<<"\n";
        int q = press(p);
        if( q == i + 2)
            S.push_back(cht[0]);
        else if( q == i + 1)
            S.push_back(cht[1]);
        else
            S.push_back(cht[2]);

        de(1) cout << "S = " << S << "\n";
    }

    p = S + cht[0] + S + cht[1];
    if( press(p) == N)
    {
        p = S + cht[0];
        if( press(p) == N)
            S.push_back(cht[0]);
        else
            S.push_back(cht[1]);
    }
    else
    {
        S.push_back(cht[2]);
    }

    de(1) cout << "ans = " << S << "\n";
    // assert( S.size() == N);
    return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:15:12: warning: unused variable 'j' [-Wunused-variable]
   15 |     int i, j;
      |            ^

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