Submission #931291

#	Time	Username	Problem	Language	Result	Execution time	Memory
931291		djs100201	Permutation (APIO22_perm)	C++17	71.22 / 100	11 ms	1372 KiB

perm

#include<bits/stdc++.h>
#include "perm.h"
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx2")
#define all(v) v.begin(),v.end()
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
using PP = pair<ll, P>;
const ll n_ =4e5+100, inf = (ll)2e9 * (ll)1e9 + 7, mod = 998244353;
ll n, m, tc = 1, a, b, c, d, sum, x, y, z, base, ans, k;
ll gcd(ll x,ll y){
	if(!y)return x;
	return gcd(y,x%y);
}
vector<int> construct_permutation(long long k){
    vector<int>res,A;
    sum=0;
    x=k-1;
    while(x){
        bool flag=0;
        for(int i=59;i>=1;i--){
            a=(1ll<<i);
            if(x>=a-1){
                x-=a-1;
                A.push_back(i);
                sum+=i;
                break;    
            }
        }
    }
    for(auto nxt:A){
        sum-=nxt;
        for(int i=0;i<nxt;i++)res.push_back(sum+i);
    }
    return res;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:23:14: warning: unused variable 'flag' [-Wunused-variable]
   23 |         bool flag=0;
      |              ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 61.215384618 / 90