72.
A treap is a cartesian tree with . . . . . . . .

74.
What must be the missing logic in place of missing lines for finding sum of nodes of binary tree in alternate levels?
//e.g:-consider -complete binary tree:-height-3, [1,2,3,4,5,6,7]-answer must be 23
n=power(2,height)-1; //assume input is height and a[i] contains tree elements
for(i=1;i<=n;)
{
      //present level is initialized to 1 and sum is initialized to  0
      for(j=1;j<=pow(2,currentlevel-1);j++) 
      {
         sum=sum+a[i];
         i=i+1;
      }
   //missing logic
}

i=i+pow(2,currentlevel);
currentlevel=currentlevel+2;
j=1;

i=i+pow(2,currentlevel);
currentlevel=currentlevel+2;
j=0;

i=i-pow(2,currentlevel);
currentlevel=currentlevel+2;
j=1;

i=i+pow(2,currentlevel);
currentlevel=currentlevel+1;
j=1;

77.
Advantages of linked list representation of binary trees over arrays?

80.
What is wrong with below code for inorder traversal of inorder threaded binary tree:
inordertraversal(threadedtreenode root):
threadedtreenode q = inorderpredecessor(root)
while(q!=root):
q=inorderpredecessor(q)
print q.data

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