Submission #699855

#	Time	Username	Problem	Language	Result	Execution time	Memory
699855		sharaelong	Permutation (APIO22_perm)	C++17	91.33 / 100	2 ms	340 KiB

perm

#include "perm.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;

vector<int> construct_permutation(ll k) {
	int pow = 0;
    while ((1ll << pow) <= k) pow++;
    pow--;
    
    int cnt = pow;
    vector<int> arr(pow, -1);
    for (int i=pow-1; i>=0; --i) {
        if (k & (1ll << i)) {
            arr[i] = pow++;
        }
    }

    vector<int> ret;
    for (int i=0; i<arr.size(); ++i) {
        if (arr[i] != -1) ret.push_back(arr[i]);
        ret.push_back(i);
    }
    return ret;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(ll)':
perm.cpp:21:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for (int i=0; i<arr.size(); ++i) {
      |                   ~^~~~~~~~~~~
perm.cpp:12:9: warning: unused variable 'cnt' [-Wunused-variable]
   12 |     int cnt = pow;
      |         ^~~

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