Adding initial files

6 files changed, 4102 insertions, 0 deletions

diff --git a/inputs/01.txt b/inputs/01.txt
new file mode 100644
index 0000000..56f4f8b
--- /dev/null
+++ b/inputs/01.txt
@@ -0,0 +1,2000 @@
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diff --git a/src/01.lisp b/src/01.lisp
new file mode 100644
index 0000000..9646e40
--- /dev/null
+++ b/src/01.lisp
@@ -0,0 +1,24 @@
+(load "~/quicklisp/setup.lisp")
+(ql:quickload "uiop")
+
+(defun get-file-lines (name)
+  (uiop:read-file-lines name))
+
+;; Turn the input file into whatever form you will use for both parts
+;; (get-file-lines) and (get-file-string) will be useful
+(defun parse-input (input-file)
+  (mapcar 'parse-integer (get-file-lines input-file)))
+
+;; Loops through two item windows on input and counts each time the first is less than the second
+(defun part-a (parsed-input)
+  (let ((sum 0) (prev 0))
+    (dolist (i parsed-input)
+      (if (> i prev) (progn (incf sum 1) (setf prev i))))
+    sum))
+
+;; Similar to part a, but with four item windows, comparing the sum of the first 3 with the next 3
+(defun part-b (parsed-input)
+  (loop for (w x y z) on parsed-input until (null z) if (< (+ w x y) (+ x y z)) count w))
+
+(time (format t "part 1: ~a~%" (part-a (parse-input "../inputs/01.txt"))))
+(time (format t "part 1: ~a~%" (part-b (parse-input "../inputs/01.txt"))))
diff --git a/src/02.lisp b/src/02.lisp
new file mode 100644
index 0000000..970e363
--- /dev/null
+++ b/src/02.lisp
@@ -0,0 +1,33 @@
+(load "~/quicklisp/setup.lisp")
+(ql:quickload 'uiop :silent t)
+(ql:quickload 'cl-ppcre :silent t)
+
+(defun get-file-lines (name)
+  (uiop:read-file-lines name))
+
+;; Turn the input file into whatever form you will use for both parts
+;; (get-file-lines) and (get-file-string) will be useful
+(defun parse-input (input-file)
+  (let ((input (mapcar (lambda (s) (cl-ppcre:split " " s)) (get-file-lines input-file))))
+    (mapcar (lambda (x) (cons (intern (string-upcase (CAR x))) (parse-integer (CADR x)))) input)))
+
+(defun part-a (parsed-input)
+  (let ((h 0) (v 0))
+    (dolist (i parsed-input)
+      (case (car i)
+        (forward (incf h (cdr i)))
+        (up (decf v (cdr i)))
+        (down (incf v (cdr i)))))
+    (* h v)))
+
+(defun part-b (parsed-input)
+  (let ((h 0) (v 0) (a 0))
+    (dolist (i parsed-input)
+      (case (car i)
+        (forward (progn (incf v (* (cdr i) a)) (incf h (cdr i))))
+        (up (decf a (cdr i)))
+        (down (incf a (cdr i)))))
+    (* h v)))
+
+(time (format t "part 2: ~a~%" (part-a (parse-input "../inputs/02.txt"))))
+(time (format t "part 2: ~a~%" (part-b (parse-input "../inputs/02.txt"))))
diff --git a/src/03.lisp b/src/03.lisp
new file mode 100644
index 0000000..ae2f0bd
--- /dev/null
+++ b/src/03.lisp
@@ -0,0 +1,45 @@
+(load "~/quicklisp/setup.lisp")
+(ql:quickload "uiop")
+
+(defun get-file-lines (name)
+  (uiop:read-file-lines name))
+
+(defun parse-bin-char (x) (case x (#\1 1) (#\0 0)))
+
+;; Turn the input file into whatever form you will use for both parts
+;; (get-file-lines) and (get-file-string) will be useful
+(defun parse-input (input-file)
+  (mapcar (lambda (x) (mapcar #'parse-bin-char (coerce x 'list))) (get-file-lines input-file)))
+
+;; Loops through two item windows on input and counts each time the first is less than the second
+(defun partial (func &rest args1)
+  (lambda (&rest args2)
+    (apply func (append args1 args2))))
+
+(defun is-less (h l)
+  (mapcar (lambda (x) (if (< x h) 0 1)) l))
+
+(defun not-list (l)
+  (mapcar (lambda (x) (if (= x 0) 1 0)) l))
+
+(defun range (max &key (min 0) (step 1))
+   (loop :for n :from (- max 1) :above (- min 1) :by step
+      :collect n))
+
+(defun to-dec (l)
+  (apply #'+ (mapcar (lambda (a b) (* a (expt 2 b))) l (range (list-length l)))))
+
+(defun part-a (parsed-input)
+  (let* ((half-length (/ (list-length parsed-input) 2))
+         (l (is-less half-length (apply (partial #'mapcar #'+) parsed-input)))
+         (gamma (to-dec l))
+         (epsilon (to-dec (not-list l))))
+    (* epsilon gamma)))
+
+;; Similar to part a, but with four item windows, comparing the sum of the first 3 with the next 3
+(defun part-b (parsed-input)
+  (loop for (w x y z) on parsed-input until (null z) if (< (+ w x y) (+ x y z)) count w))
+
+(time (format t "part 1: ~a~%" (part-a (parse-input "../inputs/03.txt"))))
+;;(time (format t "part 1: ~a~%" (part-a (parse-input "test.txt"))))
+;;(time (format t "part 1: ~a~%" (part-b (parse-input "../inputs/01.txt"))))