Submission #838774

#	Time	Username	Problem	Language	Result	Execution time	Memory
838774		arbuzick	Permutation (APIO22_perm)	C++17	91.33 / 100	2 ms	380 KiB

perm

#include <bits/stdc++.h>

using namespace std;

vector<int> construct_permutation(long long k) {
    k--;
    int len = 0;
    for (int i = 60; i > 0; --i) {
        if ((1LL << i) - 1 <= k) {
            k -= ((1LL << i) - 1);
            len = i;
            break;
        }
    }
    vector<int> count(len + 1);
    for (int i = 60; i >= 0; --i) {
        long long vl = (1LL << i);
        while (k >= vl) {
            count[i]++;
            k -= vl;
        }
    }
    vector<int> ans;
    int p = 0;
    for (int i = len; i > 0; --i) {
        p += count[i];
        ans.push_back(p);
        p++;
    }
    p = 0;
    reverse(ans.begin(), ans.end());
    for (int i = len; i >= 0; --i) {
        for (int j = 0; j < count[i]; ++j) {
            ans.push_back(p);
            p++;
        }
        p++;
    }
    reverse(ans.begin(), ans.end());
    return ans;
}

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