Submission #690671

#	Time	Username	Problem	Language	Result	Execution time	Memory
690671		saayan007	Combo (IOI18_combo)	C++17	30 / 100	52 ms	448 KiB

combo

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

using ll = long long;
using pi = pair<int, int>;
using pl = pair<long long, long long>;
using vi = vector<int>;
using vl = vector<long long>;
using vpi = vector<pair<int, int>>;
using vpl = vector<pair<long long, long long>>;

#define fur(i, a, b) for(ll i = a; i <= (ll)b; ++i)
#define ruf(i, a, b) for(ll i = a; i >= (ll)b; --i)
#define fr first 
#define sc second
#define mp make_pair
#define pb emplace_back
#define nl "\n"
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()

string guess_sequence(int N) {
    char c[] = {'A', 'B', 'X', 'Y'};
    string ans, cur;
    if(1) {
        bool flag = 0;
        fur(i, 0, 2) {
            char u = c[i];
            cur.push_back(u);
            if(press(cur) == 1) {
                ans.push_back(u);
                flag = 1;
                break;
            }
            cur.pop_back();
        }
        if(!flag) {
            ans.push_back(c[3]);
            cur.push_back(c[3]);
        }
    }

    char d[] = {'A', 'B', 'X'};
    ll j = 0;
    fur(i, 0, 3) {
        if(ans[0] == c[i])
            continue;
        else
            d[j++] = c[i];
    }

    fur(i, 1, N - 1) {
        // for(auto u : d) {
        bool flag = 0;
        fur(j, 0, 1) {
            char u = d[j];
            cur.push_back(u);
            if(press(cur) == i + 1) {
                ans.push_back(u);
                flag = 1;
                break;
            }
            cur.pop_back();
        }
        if(!flag) {
            ans.push_back(d[2]);
            cur.push_back(d[2]);
        }
    }
    return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95