Design an O(nlogn)-timealgorithm for computing the upper envelope of S.
C-5.8 Let a set of intervals S lao,bo(a1,b1..an-1,b-1l) of the interval (o, 1) be given, with 0 S ai < bi 1, for i 0, ,n-1. Suppose further that we assign a height hi to each interval [ai, bil in S. The upper envelope of S is defined to be a list of pairs [(xo, co), (xi,c1), (x2,C2),.. (xm, Cm),
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