How to take input in the tree problems?

[Shivam-Yadav-690558511135586 (Shivam Yadav)]

I am not able to understand the way input is given. Can somebody help me out on how to construct the tree from given input in tree section?

[Abhishek-Vanjani-1385688111468238 (Abhishek Vanjani)]

It is specified in the problem itself. I have encountered two types of problems.

1. Given n nodes and parent of n-1 nodes with 1 being the root. In such case, you know the parent of each node along with the root, and you can continue approaching problem with it.

2. Given n nodes and n-1 edges. In such a problem, you can use the graph approach to make the tree, using adjacency list technique.