add day 4

.gitignore

@@ -1 +1,2 @@
 .vscode
+4-crazy-eights/gameBuilder.go

4-crazy-eights/Makefile

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+.PHONY: all
+all: go js php py
+
+.PHONY: go
+go:
+	@echo "go"
+	docker run --rm -it `docker build -q -f go.Dockerfile .`
+
+.PHONY: js
+js:
+	@echo "js"
+	docker run --rm -it `docker build -q -f js.Dockerfile .`
+
+.PHONY: php
+php:
+	@echo "php"
+	docker run --rm -it `docker build -q -f php.Dockerfile .`
+
+.PHONY: py
+py:
+	@echo "py"
+	docker run --rm -it `docker build -q -f py.Dockerfile .`

4-crazy-eights/README.md

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+# Day 4 - Crazy Eights
+
+Crazy Eights is a very popular game at the North Pole, but there are no playing
+cards and the rules are completely different...
+
+**Running `./newGame` in this directory outputs a new game of Crazy Eights.**
+
+One elf will write a [7x7] matrix of digits between 0 and 9. Each digit in the
+matrix has an equal chance of being any of the ten possible digits. Once the
+matrix is complete, competing elves must find the sum of the count of 8s for
+each row and each column then add the values of the two new [1x7] matrices.
+
+Write a function that can solve a game of Elven Crazy Eights.
+
+Example:
+```
+[2  4  8  2  0  4  1] -> 1
+[5  1  2  7  6  2  1] -> 0
+[0  0  0  3  2  4  4] -> 0
+[3  1  5  3  5  2  2] -> 0
+[8  2  4  6  3  1  4] -> 1
+[1  0  8  8  5  4  8] -> 3
+[0  4  2  2  6  1  6] -> 0
+ ↓  ↓  ↓  ↓  ↓  ↓  ↓     ↓
+[1  0  2  1  0  0  1]    |
+[1  0  0  0  1  3  0] <- ⌟
+          +
+          ⇓
+[2  0  2  1  1  3  1] Solution
+```

4-crazy-eights/go.Dockerfile

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+FROM golang:1-alpine
+COPY crazy-eights.go .
+CMD [ "go", "run", "crazy-eights.go" ]

4-crazy-eights/js.Dockerfile

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+FROM node:lts-alpine
+COPY crazy-eights.js .
+CMD [ "node", "crazy-eights.js" ]

4-crazy-eights/php.Dockerfile

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+FROM php:7-cli-alpine
+COPY crazy-eights.php .
+CMD [ "php", "crazy-eights.php" ]

4-crazy-eights/py.Dockerfile

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+FROM python:3-alpine
+COPY crazy-eights.py .
+CMD [ "python", "crazy-eights.py" ]