Coursera Algorithms Part 1 Hello World 练习答案

Submit a zip file named hello.zip that contains only the three source files HelloWorld.java, HelloGoodbye.java, and RandomWord.java.

Using algs4.jar. Under construction. Write a program RandomWord.java that reads a sequence of words from standard input and prints one of those words uniformly at random. Do not store the words in an array or list. Instead, use Knuth’s method: when reading the ith word, select it with probability 1/i to be the champion, replacing the previous champion. After reading all of the words, print the surviving champion.

100% 满分解答，第三题见RandomWord.java文件