#include <iostream>
using namespace std;
int main() {
int arr[6] = { 0 };
int len = sizeof(arr) / sizeof(int);
for (int i = 0; i < len; i++) {
cin >> arr[i];
}
cout << "[";
for (int i = 0; i < len; i++) {
if (i == len - 1) {
cout << arr[i] << "]" << endl;
break;
}
cout << arr[i] << ", ";
}
// write your code here......
// 双指针
int left = 0;
int right = len - 1;
while (left <= right) {
int temp = arr[left];
arr[left] = arr[right];
arr[right] = temp;
left ++;
right --;
}
cout << "[";
for (int i = 0; i < len; i++) {
if (i == len - 1) {
cout << arr[i] << "]" << endl;
break;
}
cout << arr[i] << ", ";
}
return 0;
}