codeforce - Two Shuffled Frequnces

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
    int ara[n+1],inc[n+1],dec[n+1],in=0,de=0;
    map<int,int>mp;
    bool ok=false;
    for(int i=0;i<n;i++)
    {
        cin>>ara[i];
        mp[ara[i]]++;
    }
    sort(ara,ara+n);
    for(int i=0;i<n;i++)
    {
        if(mp[ara[i]]==1)dec[de++]=ara[i];
        else if(mp[ara[i]]==2)
        {
            dec[de++]=ara[i];
            inc[in++]=ara[i];
            i++;
        }
        else
        {
            ok=true;
            break;
        }
    }
    if(ok)
    {
        printf("NO\n");
    }
    else
    {
        printf("YES\n");
        if(in==0)
        {
            printf("0\n");
        }
        else
        {
            sort(inc,inc+in);
            printf("%d\n",in);
            for(int i=0;i<in;i++)
                printf("%d ",inc[i]);
            printf("\n");
        }
        sort(dec,dec+de);
        printf("%d\n",de);
        for(int i=de-1;i>=0;i--)
        {
            printf("%d ",dec[i]);
        }
        printf("\n");
    }
    return 0;
}