Submission #1002587

#	Time	Username	Problem	Language	Result	Execution time	Memory
1002587		fryingduc	Combo (IOI18_combo)	C++17	0 / 100	1 ms	344 KiB

combo

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

const int maxn = 2005;
const char buttons[] = {'A', 'B', 'X', 'Y'};
//int press(string s) {
//    cout << "? " << s << endl;
//    int x; cin >> x;
//    return x;
//}
string guess_sequence(int n) {
    string ans;
    string s;
    char ft = 'A';
    for(int i = 0; i < 4; ++i) {
        if(i == 3) {
            ft = buttons[i];
            break;
        }
        s = "";
        s += buttons[i];
        int x = press(s);
        if(x) {
            ft = buttons[i];
            break;
        } 
    }
    string other;
    for(int i = 0; i < 4; ++i) {
        if(buttons[i] != ft) {
            other += buttons[i];
        }
    }
    ans += ft;
    for(int len = 2; len <= n; len++) {
        s = ans + other[0];
        for(int j = 0; j < 4; ++j) {
            if(buttons[j] == ft) continue;
            s = s + ans + other[1] + buttons[j];
        }
        int x = press(s) - (int)ans.size();
        if(!x) ans += other[2];
        else if(x == 1) ans += other[0];
        else ans += other[1];
    }
    return ans;
}
//void solve() {
//    int n; cin >> n;
//    cout << guess_sequence(n);
//}
//signed main() {
//    ios_base::sync_with_stdio(0);
//    cin.tie(0);
//    
//    solve();
//    return 0;
//}

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