Submission #731437

#	Time	Username	Problem	Language	Result	Execution time	Memory
731437		ogibogi2004	Permutation (APIO22_perm)	C++17	91.33 / 100	4 ms	384 KiB

perm

#include "perm.h"
#include<bits/stdc++.h>
#define ll long long
using namespace std;
vector<int> construct_permutation(long long k)
{
    vector<int>ret;
    ll cur=1;
    for(int i=0;;i++)
    {
        ret.push_back(i);
        cur*=2;
        if(cur>k)
        {
            ret.pop_back();
            cur/=2;
            break;
        }
    }
    ll diff=k-cur;
    int cnt=-1;
    for(ll j=60;j>=0;j--)
    {
        if(diff&(1ll<<j))
        {
            //insert new number cnt where there will be j numbers after it
            vector<int>ret1;
            reverse(ret.begin(),ret.end());
            for(int l=0;l<j;l++)ret1.push_back(ret[l]);
            ret1.push_back(cnt);
            for(int l=j;l<ret.size();l++)ret1.push_back(ret[l]);
            cnt--;
            ret=ret1;
            reverse(ret.begin(),ret.end());
        }
    }
    for(int i=0;i<ret.size();i++)
    {
        ret[i]-=cnt+1;
    }
    /*for(auto xd:ret)cout<<xd<<" ";
    cout<<endl;*/
    return ret;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:31:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |             for(int l=j;l<ret.size();l++)ret1.push_back(ret[l]);
      |                         ~^~~~~~~~~~~
perm.cpp:37:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |     for(int i=0;i<ret.size();i++)
      |                 ~^~~~~~~~~~~

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