Submission #957680

#	Time	Username	Problem	Language	Result	Execution time	Memory
957680		pragmatist	Permutation (APIO22_perm)	C++17	55.43 / 100	17 ms	2024 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) {
		int j = -1;
		for(int i = 60; i >= 0; --i) {
			long long cur = (1ll<<i)-1;
			if(cur <= k) {
				j = i;
				break;
			}
		}
		int x = rng()%3;
		int i = max(0, j-x);
		n += i;
		v.push_back({n-i, n-1});
		long long cur = (1ll<<i)-1;
		k -= cur;
	}
	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: 45.430769231999996 / 90