Submission #846093

#	Time	Username	Problem	Language	Result	Execution time	Memory
846093		jamkel19	Cheerleaders (info1cup20_cheerleaders)	C++14	84 / 100	2052 ms	76036 KiB

cheerleaders

#include <bits/stdc++.h>
using namespace std;
#define st first
#define nd second
typedef long long ll;
ll n;
ll k;

void liczenie(vector<ll>a,ll q,vector<ll>&x,vector<ll>&y)
{
    if(q==-1)
    {
        return;
    }
    ll jeden=0, zero=0,ifnie=0,iftak=0;
    vector<ll>b;
    vector<ll>c;
    for(ll i=0;i<a.size();i++)
    {
        if(a[i]&(1<<q))
        {
            jeden++;
            iftak+=zero;
            b.push_back(a[i]);
        }
        else
        {
            zero++;
            ifnie+=jeden;
            c.push_back(a[i]);
        }
    }
    x[q]+=ifnie;
    y[q]+=iftak;
    liczenie(b,q-1,x,y);liczenie(c,q-1,x,y);
}
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    cin>>k;
    n=pow(2,k);
    if(k==0)
    {
        cout<<0<<endl;
        cout<<"2222"<<endl;;
    }
    vector<ll>a(n);
    for(ll i=0;i<n;i++)
    {
        ll w;
        cin>>w;
        a[w]=i;
    }
    ll wynik=9999999999999;
    ll wy;
    ll wynik2;
    for(ll i=0;i<k;i++)
    {   
        vector<ll>x(k);
        vector<ll>y(k);
        liczenie(a,k-1,x,y);
        ll r=0,u=0;
        for(ll j=0;j<k;j++)
        {
            if(x[j]>y[j])
            {
                r+=(1<<j);
            }
            u+=min(x[j],y[j]);
        }
        if(u<wynik)
        {
            wynik2=i;
            wy=r;
            wynik=u;
        }
        for(ll j=0;j<n;j++)
        {
            ll e=a[j]%2;
            a[j]/=2;
            a[j]+=(e<<(k-1));
        }
    }
    cout<<wynik<<endl;
    //cout<<wy<<endl;
    for(ll i=0;i<wynik2;i++)
    {
        cout<<2;
    }
    if((1<<(k-1))&wy)
    {
        cout<<1;
    }
    cout<<2;
    for(ll i=0;i<k-1;i++)
    {
        if(wy&(1<<i))
        {
            cout<<1;
        }
        cout<<2;
    }
    cout<<endl;
}

Compilation message (stderr)

cheerleaders.cpp: In function 'void liczenie(std::vector<long long int>, ll, std::vector<long long int>&, std::vector<long long int>&)':
cheerleaders.cpp:18:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for(ll i=0;i<a.size();i++)
      |                ~^~~~~~~~~
cheerleaders.cpp: In function 'int main()':
cheerleaders.cpp:86:17: warning: 'wynik2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   86 |     for(ll i=0;i<wynik2;i++)
      |                ~^~~~~~~
cheerleaders.cpp:90:18: warning: 'wy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   90 |     if((1<<(k-1))&wy)
      |        ~~~~~~~~~~^~~

• Subtask 1: 0 / 16
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 21 / 21
• Subtask 5: 28 / 28