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Codeforces Round #764 (Div. 3) (C. Division by Two and Permutation)

 


Bismillahir Rahmanir Rahim
///Author: Tanvir Ahmmad
///CSE,Islamic University,Bangladesh

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<sstream>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<iterator>
#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array
/*every external angle sum=360 degree
  angle find using polygon hand(n) ((n-2)*180)/n*/
///Floor[Log(b)  N] + 1 = the number of digits when any number is represented in base b
using namespace std;
typedef long long ll;

int main()
{
    ios_base :: sync_with_stdio(false);
    cin.tie(nullptr);
    ll tst,n,num;
    cin>>tst;
    while(tst--)
    {
        cin>>n;
        ll cnt=0,vis[n+3],arr[n+3];
        for(ll i=1;i<=n;i++) vis[i]=0;
        for(ll i=1;i<=n;i++)
        {
            cin>>arr[i];
            if(arr[i]<=n && vis[arr[i]]==0) vis[arr[i]]=1,arr[i]=0,cnt++;
        }
        sort(arr+1,arr+(n+1));
        for(ll i=1;i<=n;i++)
        {
            ll num=arr[i],flag=0;
            while(num!=0&&flag==0)
            {
                for(ll j=1;j<=n;j++)
                {
                    if(vis[j]==0 && num==j)
                    {
                        vis[j]=1;
                        cnt++;
                        flag=1;
                        break;
                    }
                }
                num/=2;
            }
        }
        if(cnt!=n)
            cout<<"NO"<<endl;
        else
            cout<<"YES"<<endl;
    }
    return 0;
}

Problem Link: https://codeforces.com/contest/1624/problem/C
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