This project contains data structure algorithms with Big O Notation

No more than pure Python 3 environment

How many different telephone numbers are there in the records?

Print a message: "There are different telephone numbers in the records."

Which telephone number spent the longest time on the phone during the period? Don't forget that time spent answering a call is also time spent on the phone.

Print a message: " spent the longest time, seconds, on the phone during September 2016.".

(080) is the area code for fixed line telephones in Bangalore. Fixed line numbers include parentheses, so Bangalore numbers have the form (080)xxxxxxx.)

Part A: Find all of the area codes and mobile prefixes called by people in Bangalore.

• Fixed lines start with an area code enclosed in brackets. The area codes vary in length but always begin with 0.
• Mobile numbers have no parentheses, but have a space in the middle of the number to help readability. The prefix of a mobile number is its first four digits, and they always start with 7, 8 or 9.
• Telemarketers' numbers have no parentheses or space, but they start with the area code 140.

Print the answer as part of a message: "The numbers called by people in Bangalore have codes:" The list of codes should be print out one per line in lexicographic order with no duplicates.

Part B: What percentage of calls from fixed lines in Bangalore are made to fixed lines also in Bangalore? In other words, of all the calls made from a number starting with "(080)", what percentage of these calls were made to a number also starting with "(080)"?

Print the answer as a part of a message:: " percent of calls from fixed lines in Bangalore are calls to other fixed lines in Bangalore." The percentage should have 2 decimal digits

The telephone company want to identify numbers that might be doing telephone marketing. Create a set of possible telemarketers: these are numbers that make outgoing calls but never send texts, receive texts or receive incoming calls.

Print a message: "These numbers could be telemarketers: " The list of numbers should be print out one per line in lexicographic order with no duplicates.