A function that uses the binary search algorithm to search for a value in an arraya. repeatedly divides the elements into the number of segments you specify and discards the segments that don’t have the value until the value is found and a pointer to the element is returnedb. repeatedly divides the elements in half and discards the half that doesn't have the value until the value is found and a pointer to the element is returnedc. repeatedly divides the sorted elements in half and discards the half that doesn't have the value until the value is found and the index of the element is returnedd. repeatedly divides the elements into the number of segments you specify and discards the segments that don’t have the value until the value is found and the index of the element is returned

The idea that, for each pair of devices v and w, there’s a strict dichotomy between being “in range” or “out of range” is a simplified abstraction. more accurately, there’s a power decay function f (·) that specifies, for a pair of devices at distance δ, the signal strength f(δ) that they’ll be able to achieve on their wireless connection. (we’ll assume that f (δ) decreases with increasing δ.) we might want to build this into our notion of back-up sets as follows: among the k devices in the back-up set of v, there should be at least one that can be reached with very high signal strength, at least one other that can be reached with moderately high signal strength, and so forth. more concretely, we have values p1 ≥ p2 ≥ . . ≥ pk, so that if the back-up set for v consists of devices at distances d1≤d2≤≤dk, thenweshouldhavef(dj)≥pj foreachj. give an algorithm that determines whether it is possible to choose a back-up set for each device subject to this more detailed condition, still requiring that no device should appear in the back-up set of more than b other devices. again, the algorithm should output the back-up sets themselves, provided they can be found.\