Your first task is to add code to the stage$\_$one function to read the POI records. You need to define a

struct named poi$\_$t to represent a POI, and an array of this struct type to store all POI records. This

stage outputs $(1)$ the number of POI records read, $(2)$ the POI with the largest number of categories, and

$(3)$ the categories of this POI. If there is a tie, print out the POI with the smallest ID among the tied ones.