Height of Binary Tree

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1) If node is null then return 0.
2) Else we call the recursive function, height for left and right subtree and choose their maximum.
3) We also add 1 to the result which indicates height of root of the tree.

int height(struct Node* root)
    {
        if(root==0)
        return 0;
        else
        return 1+max(height(root->right),height(root->left));
    }

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