Please explain the approach for this problem

#1
#2

hello @nidhigupta847
approach they already explained .
if any step is clear then pls let me know i will try to explain

#3

if (big - subtract <= add - small)

small = subtract;

else

big = add;

This part

#4

this part is just for updating the slab.
we have two way of updation either we update our small or big.
now which one to update ? it is based on the new difference we will get. we will update to that slab which will give less difference.
and this is what they are doing . they are comparing the two possible slab and choosing that slab which is giving less difference
if big - subtract <= add -small then that means the new range
[ subtract…big] is producing less result compared to [small…add] hence we need to update or small value to subtract.

if this condition not satisfies then we need to update our big to add

#5

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