Submission #1307923

#	Time	Username	Problem	Language	Result	Execution time	Memory
1307923		yusifm	Cheerleaders (info1cup20_cheerleaders)	C++20	13 / 100	2103 ms	157704 KiB

cheerleaders

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include <bits/extc++.h>
#define ll long long
#define str string
#define pb push_back
#define pf push_front
#define in insert
#define all(v) v.begin(),v.end()
const int sz=1000000,INF=1000000;
using namespace std;
using namespace __gnu_pbds;
ll n,num,cnt,minRes=INF;
vector<ll>res,res1,res2,Nums;
map<vector<ll>,ll>dist;
ll f(vector<ll>nums)
{
    ll res=0;
    tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>numS;
    for(int i=nums.size()-1;i>=0;i--)
    {
        res+=numS.order_of_key(nums[i]),numS.in(nums[i]);
    }
    return res;
}
vector<ll>f1(vector<ll>nums)
{
    vector<ll>nums1,nums2,res;
    for(int i=0;i<nums.size()/2;i++)
    {
        nums1.pb(nums[i]);
    }
    for(int i=nums.size()/2;i<nums.size();i++)
    {
        nums2.pb(nums[i]);
    }
    for(int i=0;i<nums2.size();i++)
    {
        res.pb(nums2[i]);
    }
    for(int i=0;i<nums1.size();i++)
    {
        res.pb(nums1[i]);
    }
    return res;
}
vector<ll>f2(vector<ll>nums)
{
    vector<ll>nums1,nums2,res;
    for(int i=0;i<nums.size();i++)
    {
        if(i%2==0)
        {
            nums1.pb(nums[i]);
        }
        else
        {
            nums2.pb(nums[i]);
        }
    }
    for(int i=0;i<nums1.size();i++)
    {
        res.pb(nums1[i]);
    }
    for(int i=0;i<nums2.size();i++)
    {
        res.pb(nums2[i]);
    }
    return res;
}
void bfs(vector<ll>nums)
{
    queue<vector<ll>>numS;
    numS.push(nums);
    dist[nums]=0,minRes=f(nums),Nums=nums,cnt=0;
    while(numS.size()!=0 && cnt<INF)
    {
        res=numS.front(),cnt++;
        numS.pop();
        if(f(res)<minRes)
        {
            minRes=f(res),Nums=res;
        }
        res1=f1(res);
        if(dist.find(res1)==dist.end())
        {
            numS.push(res1),dist[res1]=dist[res]+1;
        }
        res2=f2(res);
        if(dist.find(res2)==dist.end())
        {
            numS.push(res2),dist[res2]=dist[res]+1;
        }
    }
}
void solve()
{
    cin>>n;
    vector<ll>nums;
    for(int i=0;i<pow(2,n);i++)
    {
        cin>>num;
        nums.pb(num);
    }
    bfs(nums);
    cout<<f(Nums);
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr),cout.tie(nullptr);
    ll t=1;
    //cin>>t;
    while(t--)
    {
        solve();
    }
}

• Subtask 1: 8 / 16
• Subtask 2: 5 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 21
• Subtask 5: 0 / 28