Submission #1168158

#	Time	Username	Problem	Language	Result	Execution time	Memory
1168158		wii	Permutation (APIO22_perm)	C++17	0 / 100	0 ms	320 KiB

perm

#include <bits/stdc++.h>
#include "perm.h"

using namespace std;

void dnc(deque<int> &v, int id, long long u) {
    if (id < 0) return;

    if (u & 1) {
        dnc(v, id - 1, u >> 1);
        v.push_back(id);
    } else {
        dnc(v, id - 1, u - 1);
        v.push_front(id);
    }
}

vector<int> construct_permutation(long long k) {
    k -= 1;

    int cnt = 0;
    for (long long x = k; x > 0; x = (~x & 1 ? --x : x >> 1), ++cnt);

    deque<int> ans;
    dnc(ans, cnt - 2, k);

    return vector<int>(ans.begin(), ans.end());
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 90