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1. Create a BST of 2nd list- himanshu.rawal19 December 09, 2014
2. Now, for each point( let it x) of first list, get two values, x-radius(A) and x+radius(B)
3. Now, get points greater than A and less than B.
This can be done by reading left subtree of B in right subtree of A for each X.
nlogn ( creation of tree)+
n ( calculation of A and B) +
nlogn (locate A) +
nloga where a is number of elements in right subtree of A (locate B in right subtree of A) +
traverse left subtree of B.