Submission #979047

#	Time	Username	Problem	Language	Result	Execution time	Memory
979047		sunnat	Permutation (APIO22_perm)	C++17	0 / 100	1 ms	348 KiB

perm

#include <iostream>
#include <vector>
using namespace std;
int count_zeros(long long k){
    return k ? ((k&1)^1) + count_zeros(k>>1) : 0;
}
vector<int> construct_permutation(long long k){
    --k;
    vector<int> a;
    while(count_zeros(k - ((1LL<<a.size())-1)) > a.size())
        a.push_back(a.size());
    k -= (1LL<<a.size()) - 1;
    for(int i = 0; k > 0; ++ i){
        if((k>>i)&1){
            a.insert(a.begin()+i, a.size());
            k -= 1ll<<i;
        }
    }
    return a;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:10:48: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     while(count_zeros(k - ((1LL<<a.size())-1)) > a.size())
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~

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