Submission #982865

#	Time	Username	Problem	Language	Result	Execution time	Memory
982865		vjudge1	Permutation (APIO22_perm)	C++17	0 / 100	0 ms	600 KiB

perm

#include "perm.h"
#include <bits/stdc++.h>
using namespace std;

vector <int> construct_permutation(long long k) {

    vector <int> arr;

    for (long long i = 1, j = 0; k; j++ , i*= 2) {
        if (k % 2 == 1) {
            arr.push_back(1);
            k /= 2;
        } else {
            arr.push_back(2);
            k -= 2;
            k /= 2;
        }
    }

    //for(auto it: arr) cout<<it<<' ';

    int x;

    for(int i=0; i<arr.size(); i++, x++)
            if(arr[i] == 2) x++;

    vector <int> ans(x);

    for(int j=0, k=x-1, l=0, p = 0; j<x; j++, p++){

        if(arr[p] == 1){
            ans[j] = l;
            l++;
        } else {
            ans[j] = k;
            ans[j+1] = l;
            k--;
            l++;
            j++;
        }

    }

    return ans;

}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:24:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for(int i=0; i<arr.size(); i++, x++)
      |                  ~^~~~~~~~~~~
perm.cpp:29:38: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   29 |     for(int j=0, k=x-1, l=0, p = 0; j<x; j++, p++){
      |                                     ~^~

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