Error in code...Overflow Issue

#1

I am not able to identify where I am making a mistakeā€¦ How can I prevent the overflow issue

#2
#3

Do you have a C++ code for this?

#4

Here is your corrected code https://ide.codingblocks.com/s/184969, you donā€™t need to handle overflow issue in python, instead you had to print
C(n-1,n-k)

#5

but in the video it was said that the answer is C(n-1,k-1)