Submission #203396

#	Time	Username	Problem	Language	Result	Execution time	Memory
203396		0gnjen	Combo (IOI18_combo)	C++14	100 / 100	55 ms	552 KiB

combo

#include "combo.h"
 
using namespace std;
 
std::string guess_sequence(int N) {
    string ret = "";
    string chs = "ABXY";
 
    if( press("XY") )
    {
        if(press("X"))ret = "X" , chs = "ABY";
        else ret = "Y" , chs = "ABX";
    }
    else
    {
        if(press("A"))ret = "A" , chs = "BXY";
        else ret = "B" , chs ="AXY";
    }
 
    for(int i = 1;i<N;i++)
    {
        if(i+1==N)
        {
            string ask1 = ret;ask1+=chs[0];
            string ask2 = ret;ask2+=chs[1];
            string ask3 = ret;ask3+=chs[2];
            if(press(ask1) ==i+1 )ret = ask1;
            else if(press(ask2) ==i+1 )ret = ask2;
            else ret = ask3;
        }
        else
        {
            string ask1 = ret ;
            ask1+=chs[0];
 
            ask1+=ret;
            ask1+=chs[1];
            ask1+=chs[0];
 
            ask1+=ret;
            ask1+=chs[1];
            ask1+=chs[1];
 
            ask1+=ret;
            ask1+=chs[1];
            ask1+=chs[2];
 
            int ans =press(ask1);
            if(ans==i)ret+=chs[2];
            else if(ans==i+1)ret+=chs[0];
            else ret+=chs[1];
        }
    }
    return ret;
}

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