The green bay packers laugh at the chicago bears and decide to one-up them by finding triples (instead of pairs). you are given an input file containing information from an asymmetrical social network (e. g., twitter) about which users "follow" which other users. if user a follows b, the entry line is (a, b). write a mapreduce program (map and reduce separately) that outputs all "triples", i. e., sets of users (a, b,c) such that a follows b, b follows c, and c follows a (there might be other follows-relationships among the triple). you can chain mapreduces if you want (but only if you must, and even then, only the least number). be sure to output each triple at most once (e. g., in sorted order). you don’t need to write code – pseudocode is fine as long as it is understandable. hint: think about the "key" in map output.

Peripherals are part of the main computer. true false

Ihave a music player on my phone. i can buy songs, add them to playlists and play them. obviously it would be redundant to store each song in each playlist; each playlist is just a list of pointers to the songs. for this lab you will simulate this behavior. your program will need to have options to: add songs to the system library (you will store the text of the first line of the song, rather than the audio) add playlists add songs to a playlist list playlists play a playlist list all of the songs in the library with a count of how many times each song has been played remove a song from a playlist remove a playlist remove a song from the library (and thus from all playlists that contain it) note that we will not be checking many error cases. in real programming this would be bad, you should usually try to recognize and respond to as many types of errors as you can. in the context of class we are trying to acquaint you with as many concepts as possible, so for the sake of educational efficiency we will not be checking most errors in this lab, you may assume that your user provides correct input. you may add all appropriate error testing if you wish, but we will not be testing for it.

The “rule of 72” is used to approximate the time required for prices to double due to inflation. if the inflation rate is r%, then the rule of 72 estimates that prices will double in 72/r years. for instance, at an inflation rate of 6%, prices double in about 72/6 or 12 years. write a program to test the accuracy of this rule. for each interest rate from 1% to 20%, the program should display the rounded value of 72/r and the actual number of years required for prices to double at an r% inflation rate. (assume prices increase at the end of each year.)