Submission #1230750

#	Time	Username	Problem	Language	Result	Execution time	Memory
1230750		riddles	Combo (IOI18_combo)	C++20	0 / 100	0 ms	408 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
typedef long long ll;
typedef map<ll, ll> mp;
typedef pair<ll, ll> pll;
typedef queue<ll> qi;
typedef vector<ll> vi;
typedef vector<bool> vb;
typedef vector<vi> vvi;
typedef vector<pll> vpl;
typedef vector<string> vs;
#define YES cout << "YES\n"
#define Yes cout << "Yes\n"
#define NO cout << "NO\n"
#define No cout << "No\n"
#define F first
#define S second
#define pb push_back
#define all(x) begin(x), end(x)

ll go() {
    ll q = press("AB");
    if (q >= 1) {
        q = press("A");
        if (q == 1) return 0;
        else return 1;
    } else {
        q = press("X");
        if (q == 1) return 2;
        else return 3;
    }
}

string guess_sequence(int N) {
    string ans = "";
    vector<char> idx = {'A', 'B', 'X', 'Y'};
    ll a = go();
    ans += idx[a];
    for (int i = 1; i < N; i++) {
        string test = ans;
        if (ans[0] == 'A') {
            test += "B" + ans + "X" + ans + "Y";
        } else if (ans[0] == 'B') {
            test += "A" + ans + "X" + ans + "Y";
        } else if (ans[0] == 'X') {
            test += "A" + ans + "B" + ans + "Y";
        } else {
            test += "A" + ans + "B" + ans + "X";
        }
        
        ll k = press(test);
        if (i == N - 1) { 
            if (k == i) ans += (ans[0] == 'A' ? 'Y' : 'X');
            else if (k == i + 1) ans += (ans[0] == 'A' ? 'B' : 'A');
            else ans += (ans[0] == 'A' ? 'X' : 'B');
        } else {
            if (k == i + 1) ans += (ans[0] == 'A' ? 'B' : 'A');
            else if (k == i + 2) ans += (ans[0] == 'A' ? 'X' : 'B');
            else ans += (ans[0] == 'A' ? 'Y' : 'X');
        }
    }
    return ans;
}

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