I think this problem is not very hard and it's interesting.↵
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Description:↵
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You are given $2$ arrays $a$ and $b$ and the length of them is $n$.↵
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- $1$, $3$, $5$, ......, $2 * n - 1$ is in $a$.↵
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-2, 4, 6$2$, $4$, $6$, ......, $2 * n$ is in b$b$.↵
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Description:↵
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- $1$, $3$, $5$, ......, $2 * n - 1$ is in $a$.↵
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