Submission #968397

#	Time	Username	Problem	Language	Result	Execution time	Memory
968397		12345678	Permutation (APIO22_perm)	C++17	0 / 100	0 ms	348 KiB

perm

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

using namespace std;

#define ll long long

int mx, cnt;
ll p[62];
vector<int> res, l;

std::vector<int> construct_permutation(long long k)
{
    p[0]=1;
    for (int i=1; i<62; i++) p[i]=p[i-1]*2;
    if (k==1) return vector<int> {};
    mx=cnt=0;
    res.clear();
    l.clear();
    ll tmp=k;
    while (tmp>0)
    {
        if (tmp%2==1) mx=max(mx, cnt);
        tmp/=2;
        cnt++;
    }
    ll vl=k-p[mx];
    for (int i=0; i<mx; i++) res.push_back(i);
    if (vl==0) return res;
    vl--;
    cnt=0;
    while (vl>0)
    {
        if (vl%2==1) l.push_back(cnt);
        vl/=2;
        cnt++;
    }
    for (auto x:l) res[x]--;
    for (int i=0; i<mx; i++) res[i]++;
    res.push_back(l.size());
	return res;
}

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