Submission #706868

#	Time	Username	Problem	Language	Result	Execution time	Memory
706868		grossly_overconfident	Permutation (APIO22_perm)	C++17	91.33 / 100	2 ms	340 KiB

perm

#include "perm.h"
#include <bits/stdc++.h>
using namespace std;
set<long long> p;

vector<int> construct_permutation(long long k)
{
	int q = 1;
	if (p.empty()){
		while (true){
			p.insert(pow(2, q));
			if (q == 62){
				break;
			}
			q++;
			
		}
	}
	long long remaining = k;
	if (k % 2 != 0){
		remaining -= 1;
	}
	vector<int> out;
	vector<long long> found;
	int os = 0;
	if (k % 2 != 0){
		out.push_back(INT_MAX);
		os++;
	}
	int fs = 0;
	while (remaining > 0){
		long long t = *(--p.upper_bound(remaining));
		fs++;
		remaining -= t;
		found.push_back(t);
	}
	for (int i = 0; i < log2(found[0]); ++i){
		out.push_back(i * 2);
		os++;
	}
	for (int i = 1; i < fs; ++i){
		out.push_back((log2(found[i]) - 1) * 2 + 1);
		os++;
	}

	vector<int> outsorted = out;
	sort(outsorted.begin(), outsorted.end());

	for (int i = 0; i < os; ++i){
		for (int j = 0; j < os; ++j){
			if (outsorted[i] == out[j]){
				out[j] = i;
				break;
			}
		}
	}
	
	return out;
}
/*

long long validator(vector<long long>& dpcache, vector<int>& k, int i){
	if (dpcache[i] != -1){
		return dpcache[i];
	}
	long long count = 1;
	for (int j = i + 1; j < k.size(); ++j){
		if (k[j] > k[i]){
			count += validator(dpcache, k, j);
		}
	}
	return dpcache[i] = count;
}
int main(){
	long long n;
	cin >> n;
	auto g = construct_permutation(n);
	for (auto h : g){
		cout << h << endl;
	}
	long long count = 1;
	vector<long long> dpcache(g.size() + 10, -1);
	for (int i = 0; i < g.size(); ++i){
		count += validator(dpcache, g, i);
	}
	cout << endl << count << endl << g.size();
	return 0;
}
*/

• Subtask 1: 10 / 10
• Subtask 2: 81.333333333 / 90