I am getting WA on Rectangle problem from DSA Series Week 2: ZCO15004
Here is my solution: https://www.codechef.com/viewsolution/33424069
Please clarify what is the issue here with my code/approach.
My approach:

Find the maximum difference between all xcoordinates. Multiply this by 500 (maximum height). Let this be ans1

Find the minimum ycoordinate and multiply it by 10^5 (maximum width). Lets call this ans2.

Find the result of 10^5  max(xcoordinates) * 500. (rectangle starting at max(xcoordinate) and ending at (100000, 500)) Lets call this ans3.

Find the result of min(xcoordinates) * 500 (Rectangle starting at (0, 0) and ending at (min(xcoordinates), 500)). Lets call this ans4.

Print max(ans1, ans2, ans3, ans4)