[Solution] Confusing Concatenations CodeChef Solution

Problem

Chef initially had two non-empty arrays $A$ and $B$, where both arrays contain distinct elements. Moreover, there is no common element in the arrays $A$ and $B$.

Chef forms another array $C$ from the arrays $A$ and $B$ using the following process :

• Let $X$ denote the leftmost element of array $A$ and $Y$ denote the leftmost element of array $B$.
• If $Y$ is smaller than $X$, delete $Y$ from $B$ and append it to the end of $C$.
• If $X$ is smaller than $Y$, delete $X$ from $A$ and append it to the end of $C$.
• If either array $A$ or $B$ becomes empty, append all the remaining elements of the other array to the end of $C$.

Chef forgot the arrays $A$ and $B$ but remembers the array $C$. Find any two valid non-empty arrays $A$ and $B$ that will yield the given array $C$. If it is not possible, print $-1$.

Input Format

• The first line of input will contain a single integer $T$, denoting the number of test cases.
• Each test case consists of multiple lines of input.
• The first line of each test case contains a space-separated integer $N$ — the number of elements in array $C$.
• The next line contains $N$ space-separated integers denoting the elements of the array $C$.

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Output Format

For each test case, if a solutions exists, print any two valid arrays $A$ and $B$ along with their lengths respectively . For example, if $A= [1,7]$ and $B =[4,10,2]$, then print it as :

Explanation:

Test case $1$: We have $A = [7,6,3]$ and $B = [8,2,9]$.

• Move $1$: $X = 7$ and $Y = 8$. Since $X\lt Y$, we delete $X$ and append it to $C$. Thus, $A = [6, 3], B = [8, 2, 9],$ and $C = [7]$.
• Move $2$: $X = 6$ and $Y = 8$. Since $X\lt Y$, we delete $X$ and append it to $C$. Thus, $A = [3], B = [8, 2, 9],$ and $C = [7, 6]$.
• Move $3$: $X = 3$ and $Y = 8$. Since $X\lt Y$, we delete $X$ and append it to $C$. Thus, $A = [], B = [8, 2, 9],$ and $C = [7, 6, 3]$.
• Now, since $A$ is empty, append all elements of $B$ to $C$. Thus, $C = [7, 6, 3, 8, 2, 9]$.

Test case $2$: It can be shown that there exist no valid non-empty arrays $A$ and $B$.