Submission #985490

#	Time	Username	Problem	Language	Result	Execution time	Memory
985490		Ghetto	Permutation (APIO22_perm)	C++17	91.33 / 100	8 ms	440 KiB

perm

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

vector<int> normalise(vector<int> x, int n_pos) {
	int diff = x.size() - n_pos - 1;
	for (int& y : x) y += diff;
	return x; 
}
vector<int> construct_permutation(lint k) {
	int max_bit = 0;
	for (int i = 0; i <= 60; i++) 
		if (k & (lint) powl(2, i)) max_bit = i;
	assert(max_bit != 0);

	vector<int> ans;
	for (int i = 1; i <= max_bit; i++) ans.push_back(i);
	int prev = 1;
	for (int bit = 60; bit >= 0; bit--) {
		if (!(k & (lint) powl(2, bit))) continue;
		if (bit == max_bit) continue;
		prev--;
		int diff = max_bit - bit;
		for (auto it = ans.begin(); it != ans.end(); it++) {
			if (*it != diff) continue;
			ans.insert(next(it, 1), prev);	
			break;
		}
	}
	
	// for (int x : ans) cout << x << " ";
	// cout << endl;

	ans = normalise(ans, max_bit);
	return ans;
}

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