Submission #638477

#	Time	Username	Problem	Language	Result	Execution time	Memory
638477		TranGiaHuy1508	Permutation (APIO22_perm)	C++17	89.88 / 100	2 ms	340 KiB

perm

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

namespace {
	vector<int> primes = {2, 3, 5};

	deque<int> q;
	int lim;

	void mult(int x){
		for (int i = lim + x - 2; i >= lim; i--){
			q.push_back(i);
		}
		lim += x - 1;
	}

	void add(int x){
		for (int i = 0; i < x; i++) q.push_front(lim++);
	}

	void solve(ll k){
		if (k == 1) return;
		for (int i = (int)primes.size() - 1; i >= 0; i--){
			if (k % primes[i] == 0){
				solve(k / primes[i]);
				mult(primes[i]);
				return;
			}
		}
		if (k > 2 && (k - 2) % 5 == 0){
			solve(k - 2);
			add(2);
		}
		else{
			solve(k - 1);
			add(1);
		}
		return;
	}
}

vector<int> construct_permutation(ll k){
	lim = 0;
	solve(k);
	vector<int> v;
	while (!q.empty()){
		v.push_back(q.front());
		q.pop_front();
	}
	return v;
}

• Subtask 1: 10 / 10
• Subtask 2: 79.876923075 / 90