Serialize And Deserialize Binary Tree

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1. Serialization is to store tree in a file so that it can be later restored.
2. The structure of tree must be maintained. Deserialization is reading tree back from file.
Input Format
Input is managed for you.
Output Format
Output is managed for you.
Question Video
Constraints
0 <= Number of Nodes <= 10^5
-1000 <= value of Node data <= 1000
Sample Input
15
1
1
-1
1
1
-1
1
-1
-1
1
-1
-1
1
-1
-1
Sample Output
1 -> 1 <- 1
. -> 1 <- 1
1 -> 1 <- 1
. -> 1 <- 1
. -> 1 <- .
. -> 1 <- .
. -> 1 <- .


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