1- Implement in JAVA a method in class binary tree of integer tocopy the tree in post-order into a singly linked list.
2- Implement in JAVA a recursive method to check that a binarytree of integer numbers is a heap.
3- Implement a JAVA method by adding attribute parent to eachnode in a binary tree, starting from an existing binary tree usingin-order method, assign a reference to each parent of any node ofthe tree. Example the parent of the root is equal to null.
4- Implement in JAVA a method to calculate the sum of all valuesin a binary tree of integers.
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