AtCoder Beginner Contest 066
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Problem Statement
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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 $b$.
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The $i$-th operation is as follows:
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- Append
$a_i$to the end of$b$. - Reverse the order of the elements in
$b$.
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Find the sequence $b$ obtained after these $n$ operations.
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Constraints
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$1 \leq n \leq 2\times 10^5$$0 \leq a_i \leq 10^9$$n$and$a_i$are integers.
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Input
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Input is given from Standard Input in the following format:
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n
a_1 a_2 ... a_n
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Output
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Print $n$ integers in a line with spaces in between. The $i$-th integer should be $b_i$.
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样例
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
题目信息
题面与样例版权归 AtCoder 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。