Submission #623820

#	Time	Username	Problem	Language	Result	Execution time	Memory
623820		iomoon191	Permutation (APIO22_perm)	C++17	100 / 100	4 ms	340 KiB

perm

#include <perm.h>
using ll = long long;
//#define int ll
using namespace std;

#define sz(x) (int)(x).size()
#define foru(i, l, r) for(int i = l; i <= r; i++)
#define ford(i, l, r) for(int i = l; i >= r; i--)
#define fi first
#define se second
#define mod 998244353

#define db(x) cerr << __LINE__ << " " << #x << " " << x << "\n"
using vi = vector<int>;
using pi = pair<int, int>;

const ll N = 200005;
const ll inf = 1e18;

vi construct_permutation(ll k){
	if(k == 1) return {};
	if(k == 2) return {0};
	if(k == 3) return {1, 0};
	vi d = construct_permutation(k >> 2);
	int s = sz(d);
	if(k % 4 == 0){
		d.push_back(s);
		d.push_back(s + 1);
		return d;
	}
	if(k % 4 == 1){
		d.push_back(s);
		d.push_back(s + 1);
		d.push_back(-1);
		for(auto &i : d) i++;
		return d;
	}
	if(k % 4 == 2){
		d.push_back(s);
		d.push_back(-1);
		d.push_back(s + 1);
		for(auto &i : d) i++;
		return d;
	}
	vi _d = d;
	d.push_back(s);
	d.push_back(s + 1);
	for(auto &i : d) if(i > 1) i++;
	d.push_back(2);
	vector<ll> f(sz(d));
	ll sum = 1;
	foru(i, 0, sz(d) - 1){
		f[i] = 1;
		foru(j, 0, i - 1){
			if(d[j] < d[i]) f[i] += f[j];
			f[i] = min(f[i], inf);
		}
		sum += f[i];
		sum = min(sum, inf);
	}
	if(sum == k) return d;
	for(auto &i : _d) i += 2;
	_d.push_back(s + 2);
	_d.push_back(1);
	_d.push_back(s + 3);
	_d.push_back(0);
	return _d;
}

• Subtask 1: 10 / 10
• Subtask 2: 90 / 90