#include <iostream>
using namespace std;

int main() {
 int arr[] = {1, 2, 3, 4, 5};
 int left = 0, right = 4;
 while (left < right) {
  while (arr[left] % 2 == 1 && left < right) left++;
  ————————————————————————————————————————————————
  if (left < right) {
   swap(arr[left], arr[right]);
  }
 }
 for (int i = 0; i < 5; i++) {
  cout << arr[i] << " ";
 }
 return 0;
}