without pre-given code its very hectic to write all code from starting
There is no pre-given code to write
@Narasimha,
Its a small code only. You only have to write code for input and leftview itself. For using queue you can use inbuilt methods in java.
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It’s a good practice to write the whole code. Its gives us the freedom of choosing the data structure we want to store. Sometimes its useful in coding competitions as well. If you already have practice of taking inputs in different ways, in some cases it may be hectic due to redundancy. so try to save all these standard codes(link creating tree from given input, creating linked list from given input etc. ) somewhere. and you just need to reuse them when needed.
Thanks
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