In a network of straight-line tunnels, emergency lights will be installed at select intersections, points where several tunnels meet. The goal is that from every intersection, at least one light should be visible. You can see the light at the intersection where you are standing, and any light at the other end of a tunnel. You are given the network with n intersections, and asked whether installing k lights is enough. Required:
Prove this problem is NP-complete.

Apython programming question: assume s is a string of lower case characters. write a program that prints the number of times the string 'bob' occurs in s. for example, if s = 'azcbobobegghakl', then your program should print number of times bob occurs is: 2

The basic work area of the computer is it screen that you when you first fire up your computer

Report all segments of identity by descent longer than 20 polymorphisms between pairs of individuals in the following cohort of 15 individuals across 49 polymorphisms: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 numeric input 2 points possible (graded) you have 2 attempts to complete the assignment below. for example if the sequence is "bcd", which occurs in "abcdef" , the starting point would be 2 (b), and the finishing point would be 4(d). individuals 7,10 between positions