Submission #745385

#	Time	Username	Problem	Language	Result	Execution time	Memory
745385		Patrick	Permutation (APIO22_perm)	C++17	91.33 / 100	2 ms	340 KiB

perm

#include "perm.h"

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

std::vector<int> construct_permutation(long long k) {
    ll v = 1;
    ll a = 0;
    while (v * 2 <= k) {
        v *= 2;
        a++;
    }
    k -= v;
    vector<int> inc(a);
    while (k > 0) {
        ll s = 0;
        while ((1LL << (s + 1)) <= k) {
            s++;
        }
        inc[s] = a++;
        k -= (1LL << s);
    }
    vector<int> ans;
    for (int i = 0; i < inc.size(); i++) {
        if (inc[i] != 0) ans.push_back(inc[i]);
        ans.push_back(i);
    }
    return ans;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:25:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for (int i = 0; i < inc.size(); i++) {
      |                     ~~^~~~~~~~~~~~

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