Submission #525333

#	Time	Username	Problem	Language	Result	Execution time	Memory
525333		Khizri	Cheerleaders (info1cup20_cheerleaders)	C++17	26 / 100	2087 ms	30544 KiB

cheerleaders

#include <bits/stdc++.h>
using namespace std;
//------------------------------DEFINE------------------------------
//******************************************************************
#define IOS ios_base::sync_with_stdio(false); cin.tie(0),cout.tie(0)
#define ll long long
#define pb push_back
#define F first
#define S second
#define INF 1e18
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pii pair<int,int>
#define pll pair<ll,ll>
#define OK cout<<"Ok"<<endl;
#define MOD (ll)(1e9+7)
#define endl "\n"
//******************************************************************
//----------------------------FUNCTION------------------------------
//******************************************************************
ll gcd(ll a,ll b){
    if(a>b) swap(a,b);
    if(a==0) return a+b;
    return gcd(b%a,a);
}
ll lcm(ll a,ll b){
    return a/gcd(a,b)*b;
}
bool is_prime(ll n){
    ll k=sqrt(n);

    if(n==2) return true;
    if(n<2||n%2==0||k*k==n) return false;
    for(int i=3;i<=k;i+=2){
        if(n%i==0){
            return false;
        }
    }
    return true;
}
//*****************************************************************
//--------------------------MAIN-CODE------------------------------
const int mxn=2e5+5;
int t=1,n,say=1e7;
map<vector<int>,bool>mp;
vector<int>ans;
void f1(vector<int>&vt){
    for(int i=0;i<vt.size()/2;i++){
        swap(vt[i],vt[i+(vt.size()/2)]);
    }
}
vector<int>f2(vector<int>&vt){
    vector<int>ans;
    for(int i=0;i<vt.size();i+=2){
        ans.pb(vt[i]);
    }
    for(int i=1;i<vt.size();i+=2){
        ans.pb(vt[i]);
    }
    return ans;
}
int calc(vector<int>&vt){
    int ans=0;
    for(int i=0;i<vt.size();i++){
        for(int j=i+1;j<vt.size();j++){
            if(vt[i]>vt[j]){
                ans++;
            }
        }
    }
    return ans;
}
void funk(vector<int>vt,vector<int>res,int x){
    if(x==1){
        f1(vt);
        res.pb(1);
    }
    else if(x==2){
        vt=f2(vt);
        res.pb(2);
    }
    if(mp[vt]) return;
    mp[vt]=1;
    int xx=calc(vt);
    if(xx<say){
        say=xx;
        ans=res;
    }
    funk(vt,res,1);
    funk(vt,res,2);
}
void solve(){
    vector<int>vt;
    cin>>n;
    for(int i=1;i<=(1<<n);i++){
        int x;
        cin>>x;
        vt.pb(x);
    }
    funk(vt,{},-1);
    cout<<say<<endl;
    for(int v:ans){
        cout<<v;
    }
    cout<<endl;
}
int main(){
    IOS;
    //cin>>t;
    while(t--){
        solve();
    }
    return 0;
}

Compilation message (stderr)

cheerleaders.cpp: In function 'void f1(std::vector<int>&)':
cheerleaders.cpp:48:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |     for(int i=0;i<vt.size()/2;i++){
      |                 ~^~~~~~~~~~~~
cheerleaders.cpp: In function 'std::vector<int> f2(std::vector<int>&)':
cheerleaders.cpp:54:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for(int i=0;i<vt.size();i+=2){
      |                 ~^~~~~~~~~~
cheerleaders.cpp:57:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for(int i=1;i<vt.size();i+=2){
      |                 ~^~~~~~~~~~
cheerleaders.cpp: In function 'int calc(std::vector<int>&)':
cheerleaders.cpp:64:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |     for(int i=0;i<vt.size();i++){
      |                 ~^~~~~~~~~~
cheerleaders.cpp:65:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         for(int j=i+1;j<vt.size();j++){
      |                       ~^~~~~~~~~~

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