No.1020 Reverse
問題文最終更新日: 2020-03-18 02:40:20
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yukicoder contest 243
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Problem Statement
You are given a string $S$ of length $N$. Find the string obtained by performing the following operation in the order $i=1, 2, \ldots , N-K+1$.
- Reverse the part of $S$ from the $i$-th character to the $i+K-1$-th character.
Input
$N\ K$ $S$
- $2\leq K\leq N\leq 2\times 10^5$
- $N$ and $K$ are integers.
- $S$ is a string of length $N$ consisting of lowercase English letters.
Output
Output the string resulting from performing the operations on $S$.
Sample
Sample 1
Input
4 3 myon
Output
onmy
- First, reverse the $1$-st through $3$-rd characters of $S$. $S$ then becomes
oymn. - Next, reverse the $2$-nd through $4$-th characters of $S$. $S$ then becomes
onmy.
Sample 2
Input
9 4 ababababa
Output
bababaaba
Sample 3
Input
2 2 ac
Output
ca
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