Question: The first line in the input file contains an integer N , the number of data sets to follow. Each set starts with two integers,

The first line in the input file contains an integer N, the number of data sets to follow. Each set starts with two integers, n, and ,0d150).n is the number of important places in the city that must have a subway station nearby, and d is the maximum distance allowed between an important place and a subway station. Then comes n lines, each line containing two integers x and
 The first line in the input file contains an integer N,

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