M README.md => README.md +1 -1

**@@ 1,6 1,6 @@**
# Kattis Solutions
-My personal solutions to [Kattis](kattis) problems in various languages.
+My personal solutions to [Kattis][kattis] problems in various languages.
[kattis](https://open.kattis.com)

A cd/cd.py => cd/cd.py +49 -0

**@@ 0,0 1,49 @@**
+"""
+CD
+ Jack and Jill have decided to sell some of their Compact Discs, while they
+ still have some value. They have decided to sell one of each of the CD titles
+ that they both own. How many CDs can Jack and Jill sell?
+ Neither Jack nor Jill owns more than one copy of each CD.
+
+Input
+ The input consists of a sequence of test cases. The first line of each test
+ case contains two positive integers N and M, each at most one million,
+ specifying the number of CDs owned by Jack and
+ by Jill, respectively. This line is followed by N lines listing the catalog
+ numbers of the CDs owned by Jack in increasing order, and M more lines listing
+ the catalog numbers of the CDs owned by Jill in increasing
+ order. Each catalog number is a positive integer no greater than one
+ billion. The input is terminated by a line containing two zeros. This last line
+ is not a test case and should not be processed.
+
+Output
+ For each test case, output a line containing one integer, the number of CDs
+ that Jack and Jill both own.
+
+Algorithm
+ Until reading "0 0",
+ read the test case indicator
+ read all of Jack's CDs into a set s
+ read all of Jill's CDs out of the set s
+ print the result
+
+"""
+s = set()
+while True:
+ n_m = input()
+ if n_m == "0 0":
+ exit()
+ n_m = n_m.split(' ')
+
+ n = int(n_m[0])
+ m = int(n_m[1])
+
+ for i in range(n):
+ s.add(input())
+
+ print(f"Jack's CDS: {s}")
+ for i in range(m):
+ s.discard(input())
+ print(f"Jill's CDS: {s}")
+
+ print(len(s))