534A codeforces - Exam

534A codeforces - Exam

Link ; http://codeforces.com/contest/534/problem/A

Solution in C++

#include <bits/stdc++.h>

using namespace std;

typedef long long int lli;

#define pii pair<int,int>

int n;

int main()

{

    ios::sync_with_stdio(0);

    cin.tie(0);cout.tie(0);

    cin>>n;

    if(n==3)cout<<"2\n1 3";

    else if(n<=2)cout<<"1\n1";

    else

    {

        cout<<n<<"\n";

        for(int i=((n%2)?n:n-1);i>0;i-=2)cout<<i<<" ";

        for(int i=((n%2)?n-1:n);i>0;i-=2)cout<<i<<" ";

    }

    return 0;

}

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About Mohamed Sobhi

My name is Mo.Sobhy ,I study at School excelling high school in Ain Shams ,Cairo
My hobbies is programming ,and web development ,playing chess and writing horror stories.