Data Structures and Algorithms in Java
6th Edition
ISBN: 9781118771334
Author: Michael T. Goodrich
Publisher: WILEY
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Chapter 3, Problem 39P
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Python
The Dan Cipher works like this: shift the first lowercase character to the right by 1, the second lowercase character to the right by 2, and so on. Characters that are not lowercase characters are not changed.
Write a program that takes a string and prints the result of applying the Dan Cipher.
Write a python program that scans in a large number of tweets from a file, and prints the top 5 hashtags.
Approach
Parse each word in the file
Find a way to isolate the hashtags from the rest of the tweet
Compute the frequency of each unique hashtag.
Find the top 5 hashtags.
Caveats
1. Because this is public dataset, there are many tweets that use special characters that may cause issues during reading in your file. To avoid this, explicitly specify the encoding mode in open when reading in the file.
with open('twitter_data.txt', 'r', encoding='utf8') as f:
2. When parsing hashtags be sure to change everything to lowercase. There are cases in the file where two hashtags are the same but differ in case.
3. There is no standard way of sorting a dictionary based on the values. Python gives you access to a sorted function where you can pass in a collection and also specify a comparator which outlines how you want to sort the values. This can be done with a one line lambda function.
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Chapter 3 Solutions
Data Structures and Algorithms in Java
Ch. 3 - Prob. 1RCh. 3 - Write a Java method that repeatedly selects and...Ch. 3 - Prob. 3RCh. 3 - The TicTacToe class of Code Fragments 3.9 and 3.10...Ch. 3 - Prob. 5RCh. 3 - Prob. 6RCh. 3 - Prob. 7RCh. 3 - Prob. 8RCh. 3 - Prob. 9RCh. 3 - Prob. 10R
Ch. 3 - Prob. 11RCh. 3 - Prob. 12RCh. 3 - Prob. 13RCh. 3 - Prob. 14RCh. 3 - Prob. 15RCh. 3 - Prob. 16RCh. 3 - Prob. 17CCh. 3 - Prob. 18CCh. 3 - Prob. 19CCh. 3 - Give examples of values for a and b in the...Ch. 3 - Suppose you are given an array, A, containing 100...Ch. 3 - Write a method, shuffle(A), that rearranges the...Ch. 3 - Suppose you are designing a multiplayer game that...Ch. 3 - Write a Java method that takes two...Ch. 3 - Prob. 25CCh. 3 - Prob. 26CCh. 3 - Prob. 27CCh. 3 - Prob. 28CCh. 3 - Prob. 29CCh. 3 - Prob. 30CCh. 3 - Prob. 31CCh. 3 - Prob. 32CCh. 3 - Prob. 33CCh. 3 - Prob. 34CCh. 3 - Prob. 35CCh. 3 - Write a Java program for a matrix class that can...Ch. 3 - Write a class that maintains the top ten scores...Ch. 3 - Prob. 38PCh. 3 - Write a program that can perform the Caesar cipher...Ch. 3 - Prob. 40PCh. 3 - Prob. 41PCh. 3 - Prob. 42PCh. 3 - Prob. 43P
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- A simple and very old method of sending secret messages is the substitution cipher. You might have used this cipher with your friends when you were a kid. Basically, each letter of the alphabet gets replaced by another letter of the alphabet. For example, every 'a' get replaced with an 'X', and every 'b' gets replaced with a 'Z', etc. Write a program thats ask a user to enter a secret message. Encrypt this message using the substitution cipher and display the encrypted message. Then decryped the encrypted message back to the original message. You may use the 2 strings below for your subsitition. For example, to encrypt you can replace the character at position n in alphabet with the character at position n in key. To decrypt you can replace the character at position n in key with the character at position n in alphabet. Have fun! And make the cipher stronger if you wish! Currently the cipher only substitutes letters - you could easily add digits, puncuation, whitespace and so forth.…arrow_forwardA Caesar cipher is a simple substitution cipher based on the idea of shiftingeach letter of the plaintext message a fixed number (called the key) ofpositions in the alphabet. For example, if the key value is 2, the word"Sourpuss" would be encoded as "Uqwtrwuu." The original message canbe recovered by "reencoding" it using the negative of the key.Write a program that can encode and decode Caesar ciphers. The input to the program will be a string of plaintext and the value of the key.The output will be an encoded message where each character in the original message is replaced by shifting it key characters in the Unicode character set. For example, if ch is a character in the string and key is theamount to shift, then the character that replaces ch can be calculated as:chr (ord(ch) + key) .arrow_forwardImplement the first round of AES ( Advanced Encryption Standard ) in python. Given a message with 128 bits, two subkeys subkey0 and subkey1, your program should be able to perform one AddKey before Round 1 and the corresponding operations (SubBytes, ShiftRows, Mix-Columns, and AddKey) in Round 1, and output the result of the encryption after Round 1.arrow_forward
- Substitution ciphers are encryption/decryption algorithms that replace one letter or number with another. The first attested use of a substitution cipher in military affairs was by Julius Caesar, described by him in Gallic Wars (cf. Kahn pp83-84). In caesar cipher , you replace each letter by 3rd letter on. If it is out of bound (later than Z), then round to the head (letter A) and continue the shift. For example:meet me after the toga party PHHW PH DIWHU WKH WRJD SDUWB Please write a program in Java to implement the Caesar Cipher: a. Implement the encryption algorithm. Ask the user to input one all lower case normal sentence (called plaintext) using the nextLine method, and then output the encrypted text (called ciphertext). b. Implement the decryption algorithm. Ask the user to input one encrypted sentence (i.e. ciphertext) using the nextLine method, and then output the decrypted text (i.e. plaintext).arrow_forwardwrite a program in python as implementation of decryption of affine cipher. output should be:encrypted message is:....decrypted message is:..... plaint text: cryptologya coefficient: 3b coefficient: 1arrow_forwardcould you please code this on notepade.arrow_forward
- Write a python program that takes a string as an input from the user and checks if there are any groups of THREE consecutive vowels. The input string will be a random combination of small letter and capital letter characters. Then replace all the three consecutive vowels with “#” character. So, the presence of such a group is ensuredarrow_forwardExample 2 Enter message to be encrypted: Dèyè mòn, gen mòn. Enter step size: -1 ORIGINAL MESSAGE Dèyè mòn, gen mòn. ENCRYPTED MESSAGE Cçxç lim, fdm lim. Enter message to be encrypted: Dèyè mòn, gen mòn. Enter step size: 0 ORIGINAL MESSAGE Dèyè mòn, gen mòn. ENCRYPTED MESSAGE Dèyè mòn, gen mòn. Enter message to be encrypted: QUIT Example 3 Enter message to be encrypted: Perfer et obdura, dolor hic tib: proderit olim. Enter step size: 8 ORIGINAL MESSAGE Perfer et obdura, dolor hic tibi proderit olim. ENCRYPTED MESSAGE Xmznmz m| wjl)zi, lwtwz pąk |qją xzwlmzą| wtqu. Enter message to be encrypted: QUITarrow_forwardSolving this problem in the Java languagearrow_forward
- Python question Simple python programarrow_forwardWrite a Python program that declares a string and returns key-value pairs of the letters in alphabetical order which occur in the string together with the number of times each letter occurs. Case should be ignored.arrow_forwardWrite a Program using any programming language you are comfortable with to implement Ceasar Shift cipher technique. The algorithm should take “plaint text” and key as input and gives the cipher text as output.arrow_forward
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