Submission #872721

#	Time	Username	Problem	Language	Result	Execution time	Memory
872721		salmon	Permutation (APIO22_perm)	C++17	0 / 100	1 ms	348 KiB

perm

#include "perm.h"

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

vector<int> construct_permutation(long long k){
    vector<int> v;
    deque<int> dq;
    vector<int> bits;

    int cont = 0;
    int ze = 1;

    while(k != 0){
        bits.push_back(k % 2);
        k /= 2;
    }

    bits.pop_back();

    reverse(bits.begin(),bits.end());

    for(int i = 0; i < bits.size(); i++){
        if(bits[i] == 1 && i < bits.size() - 1 && bits[i + 1] == 1){
            dq.push_front(cont - 1);
            dq.push_front(ze);
            dq.push_front(cont);
            ze++;
            cont -= 2;

            i++;
        }
        else if(bits[i] == 1){
            dq.push_front(cont);
            dq.push_back(cont - 1);
            cont -= 2;
        }
        else{
            dq.push_front(cont);
            cont--;
        }
    }

    cont++;

    for(int i : dq){
        v.push_back(i - cont);
    }

    return v;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for(int i = 0; i < bits.size(); i++){
      |                    ~~^~~~~~~~~~~~~
perm.cpp:24:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |         if(bits[i] == 1 && i < bits.size() - 1 && bits[i + 1] == 1){
      |                            ~~^~~~~~~~~~~~~~~~~

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