Submission #821033

#	Time	Username	Problem	Language	Result	Execution time	Memory
821033		Hanksburger	Permutation (APIO22_perm)	C++17	10 / 100	155 ms	262144 KiB

perm

#include "perm.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> construct_permutation(long long k)
{
    if (k&1)
    {
        for (long long i=2; ; i*=2)
        {
            if (i<k && i*2>k)
            {
                vector<int> res1=construct_permutation(i);
                vector<int> res2=construct_permutation(k-i+1);
                for (long long j=0; j<res1.size(); j++)
                    res1[j]+=res2.size();
                for (long long j=0; j<res2.size(); j++)
                    res1.push_back(res2[j]);
                return res1;
            }
        }
    }
    long long cnt=0;
    while (k%2==0)
    {
        k/=2;
        cnt++;
    }
    if (k==1)
    {
        vector<int> res;
        for (long long i=0; i<cnt; i++)
            res.push_back(i);
        return res;
    }
    vector<int> res1=construct_permutation(1<<cnt);
    vector<int> res2=construct_permutation(k);
    for (long long j=0; j<res2.size(); j++)
        res2[j]+=res1.size();
    for (long long j=0; j<res2.size(); j++)
        res1.push_back(res2[j]);
    return res1;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:14:38: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |                 for (long long j=0; j<res1.size(); j++)
      |                                     ~^~~~~~~~~~~~
perm.cpp:16:38: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |                 for (long long j=0; j<res2.size(); j++)
      |                                     ~^~~~~~~~~~~~
perm.cpp:37:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |     for (long long j=0; j<res2.size(); j++)
      |                         ~^~~~~~~~~~~~
perm.cpp:39:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for (long long j=0; j<res2.size(); j++)
      |                         ~^~~~~~~~~~~~

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