All test cases wrong for Container Containing Most Water

#1

The code I written is correct I think, does there any other problem here ?

#2

My solution passing all test-cases on leetcode - https://leetcode.com/submissions/detail/479339676/

But not a single test case on CodingBlocks

#3

If it is accepted by leetcode, then I think that there are some faulty test cases on hackerblocks. I will report this to the staff. Your code is right.