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Topic: width and diameter of a binary tree (Read 4909 times) |
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birbal
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width and diameter of a binary tree
« on: Mar 12th, 2011, 8:21pm » |
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What is meant by width and diameter of a binary tree?
How to find it ?
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towr
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Re: width and diameter of a binary tree
« Reply #1 on: Mar 13th, 2011, 1:18am » |
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It seems that it varies what is meant. One definition for diameter is the longest path between two leaves; but that's also been called width occasionally. Another definition for width is the maximum number of nodes in the same level of a tree.
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birbal
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Re: width and diameter of a binary tree
« Reply #2 on: Mar 13th, 2011, 3:36am » |
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on Mar 13th, 2011, 1:18am, towr wrote:| It seems that it varies what is meant. One definition for diameter is the longest path between two leaves; but that's also been called width occasionally. Another definition for width is the maximum number of nodes in the same level of a tree. |
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Max number of nodes at any level are very easy to find by doing a level order BFS traversal.
What about longest path b/w two leaf nodes?
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towr
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Re: width and diameter of a binary tree
« Reply #3 on: Mar 13th, 2011, 9:46am » |
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For that you can do a depth first search. If you know how deep the left and right tree are, you know the longest path over that node in that subtree. So once you've passed through the whole tree, you'll know the longest path over any node.
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birbal
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Re: width and diameter of a binary tree
« Reply #4 on: Mar 13th, 2011, 11:46am » |
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This should work i guess
Code:
int GetDiameter(Node *n)
{
if(n == NULL)
return -1;
int leftDiameter = GetDiameter(n->left);
int rightDiameter = GetDiameter(n->right);
if(leftDiameter+rightDiameter+2 > max)
max = leftDiameter+rightDiameter+2;
if(leftDiameter > rightDiameter)
return leftDiameter+1;
return rightDiameter+1;
}
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| « Last Edit: Mar 13th, 2011, 11:47am by birbal » |
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henrikk
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Re: width and diameter of a binary tree
« Reply #5 on: Feb 19th, 2012, 7:15am » |
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diameter (T) = max ( diameter(T->left), diameter(T->right) , 1 + height(T->left) + height(T->right) );
Width(T) = maximum of nodes in a level
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frankrizal
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Re: width and diameter of a binary tree
« Reply #6 on: Feb 19th, 2012, 4:48pm » |
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The diameter of a tree (sometimes called the width) is the number of nodes on the longest path between two leaves in the tree.
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