InterviewBit Problems   Grid Unique Paths : Unsolved

My code is similar to the solution given here still getting error for A = 15 and (1)
The test cases are working correctly for custom input test, but my code is gettin (1)
When i am testing with custom input i am getting correct answer but when submitti (1)
How is the output 1 for a=1,b=1, it should be 0, as there is no path? (6)
Why there is so much problem in test cases ? The same test cases which are work (1)
Do we have to find the no. of shortest paths or All path?can there be input with (1)
Hi Anshuman, I am getting the output 319770 in my eclipse, but here 1 is being ad (2)