Why i am getting 2 test cases wrong please help me where i am doing worong

#1
#2

hello @kailash_01 ,
hello kailash,
after each iteration u need to update ur stack.
for example from a0 you will get a1 and b1
now u need to use a1 to get a2 and b2 and
then use a2 to get a3 b3 so on.

#3

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