commit b2fd306d964d4386e1e8dae54637fd93a0e35071 (patch) parent bcf06921c3260c3d37e5d933c2c344e1c1b09102 Author: Alex Karle <alex@alexkarle.com> Date: Thu, 8 Dec 2022 21:11:50 -0500 day8: Add part 1, unoptimized Diffstat:
| A | 2022/08/input | | | 99 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2022/08/sample | | | 5 | +++++ |
| A | 2022/08/sol.scm | | | 62 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
3 files changed, 166 insertions(+), 0 deletions(-)
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+35390 diff --git a/2022/08/sol.scm b/2022/08/sol.scm @@ -0,0 +1,62 @@ +#!/usr/local/bin/chicken-csi -ss +(import (chicken string) + (chicken io)) + +(define (char->digit c) + (- (char->integer c) 48)) + +(define (lines->grid lines) + (let* ((vecs (map (lambda (l) (list->vector (map char->digit l))) + (map string->list lines)))) + (list->vector vecs))) + +(define (grid-get grid r c) + (vector-ref (vector-ref grid r) c)) + +(define (neg? x) (< x 0)) + +(define (max-in-dir? grid r c dr dc) + (let ((tree (grid-get grid r c)) + (n (vector-length grid))) + (let loop ((r r) (c c)) + (let ((nr (+ r dr)) (nc (+ c dc))) + (if (or (neg? nr) (neg? nc) + (>= nr n) (>= nc n)) + #t ; made it off the map + (and (> tree (grid-get grid nr nc)) + (loop nr nc))))))) + +(define (is-visible? grid r c) + ; (print "visiting " r " " c) + (let ((n (sub1 (vector-length grid)))) + (if (or (equal? r 0) (equal? c 0) + (equal? r n) (equal? c n)) + #t + (or (max-in-dir? grid r c 0 1) + (max-in-dir? grid r c 1 0) + (max-in-dir? grid r c -1 0) + (max-in-dir? grid r c 0 -1))))) + +(define (range n) + (if (equal? n 0) + '(0) + (append (range (sub1 n)) (list n)))) + +(define (main args) + (let* ((lines (read-lines)) + (grid (lines->grid lines)) + (n (sub1 (length lines)))) + (let ((visible (map + (lambda (r) + (map (lambda (c) (if (is-visible? grid r c) 1 0)) + (range n))) + (range n)))) + ; (for-each print visible) + (print (apply + (map (lambda (l) (apply + l)) visible)))))) + +;; for repl exploration +(define gd '#(#(3 0 3 7 3) + #(2 5 5 1 2) + #(6 5 3 3 2) + #(3 3 5 4 9) + #(3 5 3 9 0)))