Urkupillit

#include <iostream>
#include <cmath>

using namespace std;

#define ll long long

int main(int argc, char ** argv) {
	cin.sync_with_stdio(false);

	ll n;
	cin >> n;
	ll k;
	cin >> k;
	if (k < 0) k = 0;
	
	if (n%2 == 0) {
		ll g = n;
		ll h = 0;
		if (g>k*2) {
			h=(g-(k*2));
			g=k*2;
		}
		bool s = false;
		for (int i=0;i<g;i+=2) {
			if (!s) s = true;
			else cout << " ";
			cout << (i+2) << " " << (i+1);
		}
		for (int i=0;i<h;i++) {
			if (!s) s = true;
			else cout << " ";
			cout << g+i+1;
		}
	} else {
		bool f = (n-1)/2==k;
		ll g = (n-2);
		ll h = 0;
		if (g>k*2) {
			h=(g-(k*2))+1;
			g=k*2;
		}
		bool s = false;
		for (int i=0;i<g;i+=2) {
			if (!s) s = true;
			else cout << " ";
			cout << (i+2) << " " << (i+(i+3==n&&!f?3:1));
		}
		for (int i=0;i<h;i++) {
			if (!s) s = true;
			else cout << " ";
			cout << g+i+1;
		}
		if (!s) s = true;
		else cout << " ";
		if (h == 0 && !f) cout << abs(n-2);
		else cout << n;
	}
	cout << "\n";
	return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: WRONG ANSWER

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: WRONG ANSWER

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: WRONG ANSWER

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER