Submission #66166747

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
// #define int long long
#define rep(i,j,k) for(int i=(j);i<=(k);i++)
#define per(i,j,k) for(int i=(j);i>=(k);i--)
#define pb emplace_back
#define fi first
#define se second
using vi=vector<int>;
using pi=pair<int,int>;

template<typename T0, typename T1> bool chmin(T0 &x,const T1 &y){
	if(y<x){x=y; return true;} return false;
}
template<typename T0, typename T1> bool chmax(T0 &x,const T1 &y){
	if(y>x){x=y; return true;} return false;
}

namespace Debug{
	template<typename T> void _debug(char *s, T x){
		cerr<< s <<" = "<< x <<endl;
	}
	template<typename T, typename ...Ar> void _debug(char *s, T x, Ar... y){
		while(*s != ',') cerr<< *s++;
		cerr<< " = "<< x <<",";
		_debug(s+1, y...);
	}
}
using namespace Debug;
#define gdb(...) _debug((char*)#__VA_ARGS__, __VA_ARGS__)

signed main(){
	#ifdef LOCAL
	freopen(".in","r",stdin);
	freopen(".out","w",stdout);
	#endif
	ios::sync_with_stdio(0);cin.tie(0);
	
	int n;
	cin >> n;

	auto output = [&](vi S){
		cout << S.size() <<'\n';
		for(int x:S){
			cout << x <<' ';
		}
		cout <<'\n';
	};

	if(n == 1){
		output(vi{1});
	}
	else{
		vi ans;
		rep(i, 1, n / 2){
			ans.pb(i * 2);
		}
		output(ans);
	}
}

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