Submission #987494

#	Time	Username	Problem	Language	Result	Execution time	Memory
987494		Zbyszek99	Cheerleaders (info1cup20_cheerleaders)	C++17	100 / 100	205 ms	4264 KiB

cheerleaders

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define size(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace std;
//mt19937 mt;void random(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll rand(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

ll poz[(1 << 18)+1];
ll zlicz_kombi[(1 << 18)+1];

pair<ll,string> solve2(int n, int m)
{
    string moves = "";
    ll inv = 0;
    rep(bit,m)
    {
        rep(bit2,(1 << (bit+1)))
        {
            zlicz_kombi[bit2] = 0;
        }
        ll w1 = 0, w2 = 0;
        rep(i,n)
        {
            
            ll kombi = poz[i] >> (m-bit-1);
         //   cout << poz[i] << " " << kombi << " " << w1 << " " << w2 << " poz\n";
            if(kombi & 1)
            {
                w1 += zlicz_kombi[kombi^1];
            }
            else
            {
                w2 += zlicz_kombi[kombi^1];
            }
            zlicz_kombi[kombi]++;
        }
      ///  cout << w1 << " " << w2 << " \n";
        if(w1 < w2) moves += '1';
        rep(i,m-1)moves += '2';
        inv += min(w1,w2);
    }
    return {inv,moves};
}

void solve()
{
    int n;
    cin >> n;
    //n--;
    if(n == 0)
    {
        cout << 0;
        return;
    }
    rep(i,(1 << n))
    {
        int a;
        cin >> a;
        poz[a] = i;
    }
   // cout << "xd\n";
    int m = (1 << n);
    pair<ll,string> wyn = {1e18,"xd"};
    rep(i,n)
    {
        pair<ll,string> wyn2;
        rep(j,i)
        {
            wyn2.ss += '2';
        }
        pair<ll,string> wyn3 = solve2(m,n);
        wyn2 = {wyn3.ff,wyn2.ss + wyn3.ss};
       //cout << "\n\n\n";
        wyn = min(wyn,wyn2);
        rep(k,m)
        {
            if(poz[k] & 1) poz[k] = (poz[k] >> 1) ^ (1 << (n-1));
            else poz[k] = (poz[k] >> 1);
        }
    }
    cout << wyn.ff << "\n" << wyn.ss ;
}

int main()
{
   // ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random();
    int t = 1;
   // cin >> t;
    while(t--) solve();
}

• Subtask 1: 16 / 16
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 21 / 21
• Subtask 5: 28 / 28