A simple test project to explore maximum of Java 8 functional features

First variant:

$ echo -e "5\n1 G 2 G\n1 M 3 M" | java -jar target/paintshop-root-<version>.jar -stdin [-v]

Different variant:

java -jar target/paintshop-root-<version>.jar <path to file> [-v]

Run

mvn clean verify

That will compile, test, gather code coverage and shade classes into 1 executable jar file that can be used to run via java -jar command

Will be here

You want to mix the colors, so that:

• There is just one batch for each color, and it's either gloss or matte.
• For each customer, there is at least one color they like.
• You make as few mattes as possible (because they are more expensive).

1. Consider that we generate bounded stream of potential solutions, that will record a singular combination of colours, per variant of customer's preference.
2. A resulting solution will have a seen-by of users, correct solution have to satisfy all users.
3. A generator will emit solutions in price increasing order (it will use up all possible combinations of GLOSS paints, and then mattes).
4. A correct cheapest solution will see all users satisfied in it and being first generated.
5. Solution will not exist when all possible combinations of paints have been exhausted.