Upper_bound and lower_bound function

#1

Is it necessary that the upper_bound and lower_bound should be applied only on the ascending order sorted arrays?

#2

Yes they work only on sorted arrays. By default they work on ascending order sorted array.
If array is sorted in descending ordered, then you would have to pass an extra parameter

low = lower_bound(v.begin(), v.end(), 3, greater<int>());          `
up = upper_bound(v.begin(), v.end(), 5, greater<int>());   `
#3

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