All test cases not satisfying plz correct this

#1
#2


A small change in line 20 was required. Please check it.

#3

Sir I am not getting why i-1 and j-1
Plz tell

#4

i=0, j=0 indicate empty respective strings.
We start from i=1 till i=s1.length()
And indices in a string are from from 0 till s1.length()-1. That’s why we subtract 1 while checking.

#5

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