Submission #1012872

#	Time	Username	Problem	Language	Result	Execution time	Memory
1012872		mindiyak	Combo (IOI18_combo)	C++14	100 / 100	23 ms	1984 KiB

combo

#include "combo.h"

#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<int, int> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<long long>> vvl;
typedef vector<ld> vd;
typedef vector<long long> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (ll i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int MOD = 1000000007;

int vpress(string a){
    // cout << a << " ";
    int val = press(a);
    // cout << val << endl;
    return val;
}

string guess_sequence(int N) {
    vector<char> chars = {'A','B','X','Y'};
    string ans = "";


    if(vpress("AB") >= 1){
        if(vpress("A") >= 1){
            ans = "A";
            chars.erase(chars.begin()+0);
        }else{
            ans = "B";
            chars.erase(chars.begin()+1);
        }
    }else{
        if(vpress("X") >= 1){
            ans = "X";
            chars.erase(chars.begin()+2);
        }else{
            ans = "Y";
            chars.erase(chars.begin()+3);
        }
    }

    if(N == 1)return ans;

    FOR(i,ans.size()+1,N){
        string temp = ans + chars[0];
        string temp2;
        FOR(j,0,3)temp2 += ans + chars[1] + chars[j];
        int val = vpress(temp+temp2);
        if(val == i){
            ans += chars[0];
        }else if(val == i+1){
            ans += chars[1];
        }else{
            ans += chars[2];
        }
    }

    FOR(j,0,2){
        string temp = ans + chars[j];
        if(vpress(temp) == N)return temp;
    }

    return ans + chars[2];
}

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