Submission #547130

#	Time	Username	Problem	Language	Result	Execution time	Memory
547130		beedle	Combo (IOI18_combo)	C++17	100 / 100	36 ms	580 KiB

combo

#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <set>
#include <iterator>
#include <stack>
#include <map>
#include <math.h>
#include <bitset>
#include <deque>
#include <string>
#include <tuple>
#include <queue>
#include <numeric>
#include <unordered_set>
#include <unordered_map>
#define pi 3.141592653589793238
#define ll long long
#define ld long double
#define rep(i, a, b) for (long long i = a; i <= b; i++)
#define mod 1000000007ll
#define INF 1000000000000000000
#define pb push_back
#define ff first
#define ss second
#define endl '\n'
#define all(x) (x).begin (), (x).end ()
#define sz(x) (ll) (x).size ()
#define reunique(v) v.resize(std::unique(v.begin(), v.end()) - v.begin())
#define rank rnk
#define log lg
#define fast                                                                  \
    ios_base::sync_with_stdio (false);                                        \
    cin.tie (NULL);                                                           \
    cout.tie (NULL)
 
using namespace std;

int press(string p);

vector <char> pos={'A','B','X','Y'};
vector <char> p1={'A','B'};
vector <char> p2={'X','Y'};

string setup(string ans)
{
    int out=press(ans+p1[0]+ans+p1[1]);
    if(out>=sz(ans)+1)
    {
        out=press(ans+p1[0]);
        if(out==sz(ans)+1)
        ans.pb('A');
        else
        ans.pb('B');
    }
    else
    {
        out=press(ans+p2[0]);
        if(out==sz(ans)+1)
        ans.pb('X');
        else
        ans.pb('Y');
    }
    return ans;
}

string guess_sequence(int n)
{
    string ans="";
    ans=setup(ans);

    vector <char> avail;
    for(auto c:pos)
    if(c!=ans[0])
    avail.pb(c);

    rep(i,1,n-2)
    {
        int out=press(ans+avail[0]+ans+avail[1]+avail[0]+ans+avail[1]+avail[1]+ans+avail[1]+avail[2]);
        if(out==sz(ans))
        ans.pb(avail[2]);
        else if(out==sz(ans)+1)
        ans.pb(avail[0]);
        else
        ans.pb(avail[1]);
    }

    if(sz(ans)!=n)
    ans=setup(ans);

    return ans;
}

// signed main()
// {
    // fast;

    // freopen("milkorder.in","r",stdin);
    // freopen("milkorder.out","w",stdout);

//     string s=guess_sequence(1);
//     cout<<s<<endl;

//     return 0;
// }

// int press(string p)
// {
//     cout<<p<<endl;
//     fflush(stdout);
//     int x;
//     cin>>x;
//     return x;
// }

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