Connect All Level Order Siblings

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Are you struggling with connecting all level order siblings? If yes, then you have landed on the right page. In this article, we will provide you with tips and tricks to connect all level order siblings with ease.

What are Level Order Siblings?

Before we dive into the ways of connecting level order siblings, let's understand what level order siblings actually are. In a binary tree, level order siblings are the nodes that are present at the same level and have the same parent. For example, consider the binary tree below:

Here, the level order siblings are (2, 3) and (6, 7).

Connecting Level Order Siblings using Pointers

One of the ways to connect level order siblings is by using pointers. We can maintain a pointer to the previous node at the same level while traversing the tree in a level order manner. Let's see how we can implement this:

void connect(Node* root) { if(!root) return; queue q; q.push(root); while(!q.empty()){ int n = q.size(); Node* prev = NULL; for(int i=0;i Node* curr = q.front(); q.pop(); if(prev) prev->nextRight = curr; prev = curr; if(curr->left) q.push(curr->left); if(curr->right) q.push(curr->right); } prev->nextRight = NULL; } }

In this implementation, we are using a queue to traverse the binary tree in a level order manner. We are maintaining a pointer to the previous node at the same level and connecting it with the current node.

Connecting Level Order Siblings using Recursion

Another way to connect level order siblings is by using recursion. We can pass the pointer to the next node at the same level while traversing the tree in a level order manner. Let's see how we can implement this:

void connect(Node* root) { if(!root) return; if(root->left) root->left->nextRight = root->right; if(root->right) root->right->nextRight = root->nextRight ? root->nextRight->left : NULL; connect(root->left); connect(root->right); }

In this implementation, we are using recursion to traverse the binary tree in a level order manner. We are passing the pointer to the next node at the same level while traversing the tree and connecting it with the current node.

Conclusion

Connecting all level order siblings in a binary tree can be achieved using pointers or recursion. Both the approaches are efficient and can be implemented easily. We hope that this article has provided you with the necessary tips and tricks to connect all level order siblings with ease. Happy coding!