Submission #89694

#	Time	Username	Problem	Language	Result	Execution time	Memory
89694		Shafin666	Combo (IOI18_combo)	C++14	5 / 100	3 ms	256 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
#define mp make_pair
#define pb push_back
#define pii pair<int, int>
typedef long long ll;
typedef long double ld;
using namespace std;

char f[4];

void scramble(string str) {
    for(int i = 0; i < 3; i++) f[i] = str[i];
}

std::string guess_sequence(int N) {
    string str = "AB";
    int k = press(str);
    if(k >= 1) {
        str = "A";
        k = press(str);
        if(k == 1) f[3] = 'A', scramble("BXY");
        else f[3] = 'B', scramble("AXY");
    } else {
        str = "Y";
        k = press(str);
        if(k == 1) f[3] = 'Y', scramble("ABX");
        else f[3] = 'X', scramble("ABY");
    }

    string S; S += f[3];
    int len = 1;
    
    while(len < N-1) {
        string tmp = S+f[0]+f[1] + S+f[0]+f[2] + S+f[0]+f[0] + S+f[2];
        k = press(tmp);
        if(k == len+1) S += f[2], len++;
        else if(k == len+2) S += f[0], len++;
        else S += f[1], len++; 
    }

    string tmp = S + f[0] + S + f[1];
    k = press(tmp);
    if(k == len+1) {
        tmp = S + f[0];
        k = press(tmp);
        if(k == len+1) return S + f[0];
        else return S + f[1];
    } return S + f[2];
}

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