Submission #896980

#	Time	Username	Problem	Language	Result	Execution time	Memory
896980		vjudge1	Permutation (APIO22_perm)	C++17	63.23 / 100	38 ms	1620 KiB

perm

#include "perm.h"
#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int N = 5e3+3, M = 1e2+2;
const ll L = 62;


vector<int> construct_permutation(ll k)
{	
	vector<int> p;
	if (!k) return p;

	for (int i = 1; i <= M; i++) {
		// cojo i subsequences
		// he de sumar k+i-1
		ll nwK = k+i-1;
		int cnt[L+1];
		for (int j = L; j >= 0; j--) {
			cnt[j] = (((nwK >> j) & 1) ? 1 : 0);
		}
		
		int c = __builtin_popcountl(nwK);
		while (c < i) {
			bool b = 0;
			for (int j = L; j > 0; j--) {
				if (cnt[j]) {
					cnt[j-1] += 2;
					cnt[j]--;
					c++;
					b = 1;
					break;
				}
			}

			if (!b) break;
		}

		if (c != i) continue;
//cerr << "cojo " << i << endl;
		int r = N;
		vector<int> p2;
		for (int j = L; j >= 0; j--) {
			while (cnt[j]--) {
				for (int l = 1; l <= j; l++) {
					p2.push_back(r-j+l);
					//cerr << r-j+l << endl;
				}
				r -= j;
			}
		}

		if (p.empty() || p2.size() < p.size()) swap(p, p2);
	}

	int sz = p.size();
	for (int i = 0; i < sz; i++) {
		p[i] -= N-sz+1;
	}

	return p;
}

• Subtask 1: 10 / 10
• Subtask 2: 53.230769235 / 90