Submission #982880

#	Time	Username	Problem	Language	Result	Execution time	Memory
982880		vjudge1	Permutation (APIO22_perm)	C++17	91.33 / 100	2 ms	600 KiB

perm

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

vector<int> construct_permutation(long long k) {
	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 = 0;

	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:24:20: 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++)
      |                  ~~^~~~~~~~~~~~

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