Submission #647964

#	Time	Username	Problem	Language	Result	Execution time	Memory
647964		JANCARAPAN	Combo (IOI18_combo)	C++17	100 / 100	33 ms	532 KiB

combo

#include "combo.h"
//#include <bits/stdc++.h>
using namespace std;

string ch = "ABXY";

string guess_sequence(int n) {
    string s = "";
    string a = "";

    int block = -1;

    if (press("AB") >= 1) {
        if (press("A") == 1) block = 0;
        else block = 1;
    } else {
        if (press("X") == 1) block = 2;
        else block = 3;
    }

    s += ch[block];

    for (int i=0; i<4; i++) {
        if (block == i) continue;
        a += ch[i];
    }

    if (n == 1) return s;

    for (int i=1; i<n-1; i++) {
        int len = press(s+a[0]+s+a[1]+a[1]+s+a[1]+a[0]+s+a[1]+a[2]);

        if (len == i + 1) s += a[0];
        else if (len == i + 2) s += a[1];
        else s += a[2];
    }


    if (press(s+a[0]) == n) return s+a[0];
    else if (press(s+a[1]) == n) return s+a[1];
    else return s+a[2];
    
}

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