Submission #957687

#	Time	Username	Problem	Language	Result	Execution time	Memory
957687		pragmatist	Permutation (APIO22_perm)	C++17	71.22 / 100	17 ms	1584 KiB

perm

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

using namespace std;

mt19937 rng(time(NULL));

std::vector<int> construct_permutation(long long k)
{
	vector<int> ans;
	k--;
	int n = 0;
	vector<pair<int, int> > v;
	while(k>0) {
		long long mx = 0;
		int x = -1, y = -1;
		for(int i = 1; i <= 60; ++i) {
			long long cur = (1ll<<i)-1;
			if(cur <= k) {
				if(cur>mx) {
					mx = cur;
					x = i;
					y = -1;
				}
			}
			for(int j = 1; j <= 60; ++j) {
				long long ruc = cur+(1ll<<j)-1;
				if(ruc<=k) {
					if(ruc>mx) {
						mx = ruc;
						x = i;
						y = j;
					}
				}
			}
		}
		if(y == -1) {
			long long cur = (1ll<<x)-1;
			k -= cur;
			n += x;
			v.push_back({n-x, n-1});
			continue;
		}
		long long c1 = (1ll<<x)-1;
		long long c2 = (1ll<<y)-1;
		k -= c1;
		k -= c2;
		n += x;
		v.push_back({n-x, n-1});
		n += y;
		v.push_back({n-y, n-1});
	}
	reverse(v.begin(), v.end());
	for(auto e : v) {
		int l = e.first;
		int r = e.second;
		for(int i = l; i <= r; ++i) {
			ans.push_back(i);
		}
	}
	return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 61.215384618 / 90