Submission #295498

#	Time	Username	Problem	Language	Result	Execution time	Memory
295498		arayi	Combo (IOI18_combo)	C++17	100 / 100	35 ms	568 KiB

combo

#include "combo.h"
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#define ad push_back
using namespace std;

string ans;
vector <char> a;
void frst()
{
    int sm = press("AB");
    
    if (sm == 2)
    {
        ans = "AB";
        a.ad('B'), a.ad('X'), a.ad('Y');
        return;
    }
    if (sm == 1)
    {
        sm = press("A");
        if (sm) ans = "A", a.ad('B'), a.ad('X'), a.ad('Y');
        else ans = "B", a.ad('A'), a.ad('X'), a.ad('Y');
        return;
    }
    if (sm == 0)
    {
        sm = press("X");
        if (sm) ans = "X", a.ad('B'), a.ad('A'), a.ad('Y');
        else ans = "Y", a.ad('B'), a.ad('X'), a.ad('A');
        return;
    }
}
string guess_sequence(int n) {
    frst();
    string p;
    while ((int)ans.length() <= n - 2)
    {
        p = "";
        p += ans + a[0] + a[0];
        p += ans + a[0] + a[1];
        p += ans + a[1] + a[1];
        int sm = press(p);
        if (sm == (int)ans.length())
        {
            ans += a[2];
        }
        else if (sm == 2 + (int)ans.length())
        {
            p = "";
            p += ans + a[0] + a[0];
            sm = press(p);
            if (sm == (int)ans.length()) ans += a[1], ans += a[1];
            else if (sm == (int)ans.length() + 1) ans += a[0], ans += a[1];
            else ans += a[0], ans += a[0];
        }
        else
        {
            p = "";
            p += ans + a[1] + a[0];
            sm = press(p);
            if (sm == (int)ans.length()) ans += a[0], ans += a[2];
            else if (sm == (int)ans.length() + 1) ans += a[1], ans += a[2];
            else ans += a[1], ans += a[0];
        }
    }
    if ((int)ans.length() == n - 1)
    {
        p = "";
        p += ans + a[0];
        p += ans + a[1];
        int sm = press(p);
        if (sm == (int)ans.length()) ans += a[2];
        else
        {
            p = ans + a[0];
            sm = press(p);
            if (sm == (int)ans.length() + 1) ans += a[0];
            else ans += a[1];
        }
    }
   // cout << ans << endl;
    return ans;
}

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