Set Algebra From Input

Read two lines from standard input. The first line holds the integers of set A and the second line the integers of set B, separated by spaces. A line may repeat a value, and every line contains at least one integer.

Then print exactly three lines, in this order:

1. The label Union: followed by every value that is in A or B (or both), ascending.
2. The label Intersection: followed by every value that is in both A and B, ascending.
3. The label A only: followed by every value that is in A but not in B, ascending.

Each label is followed by one space, then the values separated by single spaces (a trailing space after the last value is fine). If a result has no values, print (none) in place of the values, for example A only: (none).

Example input:
1 2 3
2 3 4

The output for that input is shown in Expected Output.

Expected Output:

Union: 1 2 3 4↵
Intersection: 2 3↵
A only: 1↵
Union: 5 6↵
Intersection: 5 6↵
A only: (none)↵
Union: 1 4 9↵
Intersection: (none)↵
A only: 1 4↵

= newline. The output ends with a newline — print one after the last line.

Hints4 available

Topics:

STL ContainersSets

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