why are we subtracting 1 even after adding compare function to lower_bound. after adding the compare parameter it will return element <=168 . then why subtract 1
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to access the value at index the value is actually at
with lower_bound - vec[0] u get index which is not 0 based
so access the value make it 0 based by subtracting 1 from it
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But in Binary search lecture, we did not do -1 in the lower bound, but still it was 0 based.