CRANCRD - Editorial

Level: Cakewalk

Concepts: Basic Geometry

Problem Link:

Johny measures the distance between P1(x1,y1) and P2(x2,y2) as :
D(P1,P2) = |x1 - x2| + |y1 – y2|

A circle according to Johny’s understanding will actually be a square with diagonals parallel to the x and y axes.
Follow the second page of this doc for a pictorial explanation.

Hence the answer is 2*r^2.