Submission #957681

#	Time	Username	Problem	Language	Result	Execution time	Memory
957681		pragmatist	Permutation (APIO22_perm)	C++17	10 / 100	17 ms	1884 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;
		int mx = 0;
		for(int i = 60; i >= 1; --i) {
			long long cur = (1ll<<i)-1;
			if(cur <= k) {
				if(cur == k) {
					j = i;
					break;
				}
				int cnt = __builtin_popcountll(k-cur);
				if(cnt>mx) {
					mx = cnt;
					j = i;
				}
			}
		}
		int i = j;
		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: 0 / 90