Amazon Interview Question


Country: India




Comment hidden because of low score. Click to expand.
1
of 1 vote

public void buildDLstWrapper( Node root)
{
    Node prev = null;
    buildDLst(root,prev);
}

public void buildDLst( Node root, Node prev)
{
    if(root!=null)
    {
        buildDLst(root.left,prev);
        if(prev!=null)
            prev.right = root;
        root.left = prev;
        prev = root;
        buildDLst(root.right, prev);
    }
}

- sankarmail February 05, 2012 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 votes

The above one is for BST

- sankarmail February 05, 2012 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 vote

Copy all the elements into array O(n) space O(n) time
Sort the array O(nlogn) time
make a doubly linked list O(n) time
Complexity upper bound: O(n)space O(nlogn) time


If the tree were binary search tree then there exist algorithm to convert the same tree in to sorted doubly linked list
thealgorithmist.com/showthread.php/476-BinaryTreeTemplate-All-BST-problems?p=2257&viewfull=1#post2257

- zino January 29, 2012 | Flag Reply


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