Pocket Gems Software Developer interview questions

n new students at college with no friends, as the semester progresses, circles of friends start to form and grow. 2 types of queries are defined: add friend and return number of friends. an input file contains multiple queries and also indicates on which students the queries should be performed. implement a function which returns an array of integers where the value at each index j denotes the answer for the jth query of type "return number of friends"