Submission #574046

#	Time	Username	Problem	Language	Result	Execution time	Memory
574046		Stickfish	Permutation (APIO22_perm)	C++17	100 / 100	2 ms	340 KiB

perm

#include "perm.h"
#include <algorithm>
using ll = long long;
using namespace std;

const int MAXVAL = 50001;

vector<int> construct_permutation(ll k) {
    int mxlast = MAXVAL;
    int mnlast = -1;
    vector<int> ans;
    while (k > 1) {
        if (k % 2 == 0) {
            ans.push_back(++mnlast);
            k /= 2;
        } else if (k % 3 == 0) {
            ans.push_back(mnlast + 2);
            ans.push_back(mnlast + 1);
            k /= 3;
            mnlast += 2;
        } else if (k % 5 == 0) {
            ans.push_back(mnlast + 3);
            ans.push_back(mnlast + 1);
            ans.push_back(mnlast + 2);
            k /= 5;
            mnlast += 3;
        } else if (k % 23 == 0) {
            //2 3 5 1 6 4
            ans.push_back(mnlast + 2);
            ans.push_back(mnlast + 3);
            ans.push_back(mnlast + 5);
            ans.push_back(mnlast + 1);
            ans.push_back(mnlast + 6);
            ans.push_back(mnlast + 4);
            k /= 23;
            mnlast += 6;
        } else {
            ans.push_back(--mxlast);
            --k;
        }
    }
    vector<int> cmp;
    for (auto x : ans)
        cmp.push_back(x);
    sort(cmp.begin(), cmp.end());
    for (auto& x : ans)
        x = lower_bound(cmp.begin(), cmp.end(), x) - cmp.begin();
    return ans;
}

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