Submission #434737

#	Time	Username	Problem	Language	Result	Execution time	Memory
434737		OttoTheDino	Combo (IOI18_combo)	C++17	100 / 100	48 ms	628 KiB

combo

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

#define rep(i,s,e)                  for (int i = s; i <= e; ++i)
#define rrep(i,s,e)                 for (int i = s; i >= e; --i)
#define pb                          push_back
#define pf                          push_front
#define fi                          first
#define se                          second
#define all(a)                      a.begin(), a.end()
typedef long long ll;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<string> vs;
typedef vector<char> vc;
typedef vector<ll> vll;

string guess_sequence(int n) {
    int ab = press("AB"), ax = press("AX");
    string a = "ABXY";
    if (ab>0 && ax==0) a = "BAXY";
    else if (ab==0 && ax>0) a = "XABY";
    else if (ab==0 && ax==0) a = "YABX";
    string ans(1,a[0]);
    if (n==1) return ans;
    rep (i,1,n-2) {
        string s;
        rep (j,1,3) s += ans+a[1]+a[j];
        s += ans+a[2];
        int val = press(s);
        if (val==(int)ans.size()) ans += a[3];
        else if (val==(int)ans.size()+1) ans += a[2];
        else ans += a[1];
    }
    if (press(ans+a[1]+ans+a[2])==n) {
        if (press(ans+a[1])==n) return ans+a[1];
        return ans+a[2];
    }
    return ans+a[3];
}

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