Submission #552675

#	Time	Username	Problem	Language	Result	Execution time	Memory
552675		lethinh05	Combo (IOI18_combo)	C++11	100 / 100	37 ms	552 KiB

combo

#include <bits/stdc++.h>
#ifndef LOCALME
#include <combo.h>
#endif // LOCALME

#define oo 1000000007
#define ll long long
#define ld long double
#define ii pair<int, int>
#define pll pair<ll, ll>
#define ff first
#define ss second
#define mp make_pair
#define vi vector<int>
#define vii vector<ii>
#define sz(a) (int)(a.size())
#define pb push_back
#define fto(i, a, b) for (int i = (int)(a); i <= (int)(b); ++i)
#define fdto(i, a, b) for (int i = (int)(a); i >= (int)(b); --i)
#define bug(x) "["#x" = "<<(x)<<"] "
#define maxN 10005

using namespace std;

char chrs[] = {'A', 'B', 'X', 'Y'};

#ifdef LOCALME
int press(const string &p) {
    cout << p << "\n";
    fflush(stdout);
    int x; cin >> x;
    return x;
}
#endif // LOCALME

string guess_sequence(int n) {
    string s = "";
    int i = -1;
    int matches = press("AB");
    if (matches >= 1) {
        matches = press("A");
        if (matches == 1) s += "A", i = 0;
        else s += "B", i = 1;
    } else {
        matches = press("X");
        if (matches == 1) s += "X", i = 2;
        else s += "Y", i = 3;
    }

    fto(j, 2, n-1) {
        int len = s.length();
        matches = press(s+chrs[(i+1)%4] + s+chrs[(i+2)%4]+chrs[(i+1)%4] + s+chrs[(i+2)%4]+chrs[(i+2)%4] + s+chrs[(i+2)%4]+chrs[(i+3)%4]);
        if (matches == len) {
            s += chrs[(i+3)%4];
        } else if (matches == len+1) {
            s += chrs[(i+1)%4];
        } else {
            s += chrs[(i+2)%4];
        }
    }

    if (n >= 2) {
        int matches = press(s+"A" + s+"B");
        if (matches >= (int)s.length()+1) {
            matches = press(s + "A");
            if (matches == (int)s.length()+1) s += "A", i = 0;
            else s += "B", i = 1;
        } else {
            matches = press(s + "X");
            if (matches == (int)s.length()+1) s += "X", i = 2;
            else s += "Y", i = 3;
        }
    }

    return s;
}

#ifdef LOCALME
int main() {
    //ios_base::sync_with_stdio(false); cin.tie(NULL);

    int n; cin >> n;
    string s = guess_sequence(n);
    cout << s << "\n";

    return 0;
}
#endif

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