Submission #730760

#	Time	Username	Problem	Language	Result	Execution time	Memory
730760		alextodoran	Permutation (APIO22_perm)	C++17	91.33 / 100	2 ms	340 KiB

perm

/**
 _  _   __  _ _ _  _  _ _
 |a  ||t  ||o    d | |o  |
| __    _| | _ | __|  _ |
| __ |/_  | __  /__\ / _\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

vector <int> construct_permutation (ll k) {
    int bits = 63 - __builtin_clzll(k);
    int len = bits + __builtin_popcountll(k) - 1;
    if (true) {
        vector <int> p;
        int l = 0, r = len - 1;
        for (int e = 0; e < bits; e++) {
            if ((k >> e) & 1) {
                p.push_back(r--);
            }
            p.push_back(l++);
        }
        return p;
    } else {
        vector <int> p = construct_permutation(k / 3);
        int len = (int) p.size();
        vector <int> q;
        for (int i = len + k % 3 + 1; i > len + 1; i--) {
            q.push_back(i);
        }
        for (int x : p) {
            q.push_back(x);
        }
        q.push_back(len + 1);
        q.push_back(len);
        return q;
    }
}

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