pushpush

AtCoder

IDarc077_a

Time2000ms

Memory256MB

Difficulty—

You are given an integer sequence of length $n$, $a_1, ..., a_n$. Let us consider performing the following $n$ operations on an empty sequence $b$. The $i$\-th operation is as follows: 1. Append $a_i$ to the end of $b$. 2. Reverse the order of the elements in $b$. Find the sequence $b$ obtained after these $n$ operations. ## Constraints * $1 \leq n \leq 2\times 10^5$ * $0 \leq a_i \leq 10^9$ * $n$ and $a_i$ are integers. ## Input Input is given from Standard Input in the following format: $n$ $a_1$ $a_2$ $...$ $a_n$ [samples]

Samples

Input #1

4
1 2 3 4

Output #1

4 2 1 3

*   After step 1 of the first operation, $b$ becomes: $1$.
*   After step 2 of the first operation, $b$ becomes: $1$.
*   After step 1 of the second operation, $b$ becomes: $1, 2$.
*   After step 2 of the second operation, $b$ becomes: $2, 1$.
*   After step 1 of the third operation, $b$ becomes: $2, 1, 3$.
*   After step 2 of the third operation, $b$ becomes: $3, 1, 2$.
*   After step 1 of the fourth operation, $b$ becomes: $3, 1, 2, 4$.
*   After step 2 of the fourth operation, $b$ becomes: $4, 2, 1, 3$.

Thus, the answer is `4 2 1 3`.

Input #2

3
1 2 3

Output #2

3 1 2

As shown above in Sample Output 1, $b$ becomes $3, 1, 2$ after step 2 of the third operation. Thus, the answer is `3 1 2`.

Input #3

1
1000000000

Output #3

1000000000

Input #4

6
0 6 7 6 7 0

Output #4

0 6 6 0 7 7

API Response (JSON)

{
  "problem": {
    "name": "pushpush",
    "description": {
      "content": "You are given an integer sequence of length $n$, $a_1, ..., a_n$. Let us consider performing the following $n$ operations on an empty sequence $b$. The $i$\\-th operation is as follows: 1.  Append $a_",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "arc077_a"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You are given an integer sequence of length $n$, $a_1, ..., a_n$. Let us consider performing the following $n$ operations on an empty sequence $b$.\nThe $i$\\-th operation is as follows:\n\n1.  Append $a_...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments