Submission #980631

#	Time	Username	Problem	Language	Result	Execution time	Memory
980631		Nexus	Permutation (APIO22_perm)	C++17	91.33 / 100	1 ms	560 KiB

perm

#include <bits/stdc++.h>
#define ll long long

using namespace std;

const ll N=1e6+9,M=2e18+9,mod=1e9+7;

ll a[66],q,k,x,y,z;
vector<int>v;

ll po(ll X,ll Y)
{
	if(!Y)return 1;
	if(Y&1)return X*po(X,Y-1);
	ll ret=po(X,Y/2);
	return ret*ret;
}

ll log2(ll k)
{
	ll g=0;
	while(k>1)k/=2,++g;
	return g;
}

vector<int>construct_permutation(ll k)
{
    x=log2(k);
    v.clear();
    y=x-1;
    k-=po(2,x);
    for(ll i=62;i>=0;--i)
    {
        if(k>=po(2,i))k-=po(2,i),a[i]=1,++y;else a[i]=0;
    }
    for(ll i=0;i<x;++i)
    {
        if(a[i])v.push_back(y),--y;
        v.push_back(i);
    }
    return v;
}

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