Educational Codeforces Round 135 (Rated for Div. 2) (B. Best Permutation)

Bismillahir Rahmanir Rahim

Bangla tutorial:https://www.youtube.com/watch?v=jJEXNroYls8&t=566s&ab_channel=AlgoBot

///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(NULL);

    ll tst,n,start;

    cin>>tst;

    while(tst--)

{

        cin>>n;

        if(n%2)

{

            cout<<n-3<<' '<<n-2<<' ';

            ll start=n-4;

            while(start--) cout<<start+1<<' ';

            cout<<n-1<<' '<<n<<endl;

}

        else

{

            ll start=n-2;

            while(start--) cout<<start+1<<' ';

            cout<<n-1<<' '<<n<<endl;

}

}

    return 0;

}

///Alhamdulillah

Problem Link: https://codeforces.com/problemset/problem/1728/B

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