day 2 puzzle 1

progress.yaml

@@ -1,2 +1,4 @@
 1:
   stars: 2
+2:
+  stars: 1

res/examples/day2.txt

@@ -0,0 +1,6 @@
+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9

src/day1/puzzle1.typ

@@ -15,7 +15,7 @@
 }
 
 #show-puzzle(
-  1,
+  1, 1,
   solve,
   example: 11
 )

src/day1/puzzle2.typ

@@ -1,4 +1,5 @@
 #import "/src/utils.typ": *
+#import "@preview/cetz:0.3.1": canvas, draw
 
 #let solve(input) = {
   let lines = input.split("\n")
@@ -29,8 +30,57 @@
   return total
 }
 
-#show-puzzle(
-  1,
-  solve,
-  example: 31
+#let visualize(input) = {
+  let lines = input.split("\n")
+  let (l1, l2) = ((), ())
+  let reg = regex("^(\d+)\s+(\d+)$")
+  for line in lines {
+    let digits = line.match(reg)
+    l1.push(digits.captures.first())
+    l2.push(digits.captures.last())
+  }
+
+  let unique = l1.dedup()
+  let colors = (red,green)
+  canvas({
+    for (i, n) in l1.enumerate() {
+      let y = -0.9 * i
+      draw.circle(
+        (0, y),
+        radius: 0.35,
+        stroke: black,
+        name: "l" + str(i)
+      )
+      draw.content((0, y), n)
+    }
+    for (i, n) in l2.enumerate() {
+      let y = -0.9 * i
+      draw.circle(
+        (4, y),
+        radius: 0.35,
+        stroke: black,
+        name: "r" + str(i)
+      )
+      draw.content((4, y), n)
+    }
+    for (i, a) in l1.enumerate() {
+      for (j, b) in l2.enumerate() {
+        if a == b {
+          draw.line(
+            "l" + str(i),
+            "r" + str(j),
+            stroke: colors.at(unique.position(n => n == a)) + 1.5pt,
+            mark: (end: "straight")
+          )
+        }
+      }
+    }
+  })
+}
+
+#show-puzzle(
+  1, 2,
+  solve,
+  example: 31,
+  visualize: visualize
 )

src/day2/puzzle1.typ

@@ -0,0 +1,35 @@
+#import "/src/utils.typ": *
+
+#let solve(input) = {
+  let safe-cnt = 0
+  for line in input.split("\n") {
+    let nums = line.split(" ").map(n => int(n))
+
+    let increasing
+    let safe = true
+    for i in range(nums.len() - 1) {
+      let d = nums.at(i + 1) - nums.at(i)
+      let abs-d = calc.abs(d)
+      if abs-d < 1 or abs-d > 3 {
+        safe = false
+        break
+      }
+      if i == 0 {
+        increasing = d > 0
+      } else if (d > 0) != increasing {
+        safe = false
+        break
+      }
+    }
+    if safe {
+      safe-cnt += 1
+    }
+  }
+  return safe-cnt
+}
+
+#show-puzzle(
+  2, 1,
+  solve,
+  example: 2
+)

src/utils.typ

@@ -1,5 +1,7 @@
 #let star-state = state("stars", (:))
 
+#let star = text(font: "Twitter Color Emoji", emoji.star)
+
 #let get-input-path(day) = {
   return "/res/inputs/day" + str(day) + ".txt"
 }
@@ -13,8 +15,15 @@
   return read(get-input-path(day))
 }
 
-#let check-example(day, func, target-result, suffix: none) = {
-  let result = (func)(read(get-example-path(day, suffix: suffix)))
+#let check-example(
+  day,
+  func,
+  target-result,
+  suffix: none,
+  visualize: none
+) = {
+  let input = read(get-example-path(day, suffix: suffix))
+  let result = (func)(input)
   let passes = (result == target-result)
   let name = if suffix == none [Example] else [Example '#suffix']
   let badge = box(
@@ -38,6 +47,14 @@
   }
 
   [#badge #h(0.6em)]
+
+  if visualize != none {
+    linebreak()
+    figure(
+      visualize(input),
+      caption: [#name (visualization)]
+    )
+  }
 }
 
 #let show-result(result) = {
@@ -46,30 +63,35 @@
     radius: 1.2em,
     baseline: 35%,
     fill: blue.lighten(20%),
-    text(fill: white)[Result: #result]
+    text(fill: white)[Result: #raw(repr(result))]
   )
 }
 
-#let show-puzzle(puzzle, func, example: none) = {
+#let show-puzzle(day, puzzle, func, example: none, visualize: none) = {
+  let check-example = check-example.with(visualize: visualize)
   if example != none {
     if type(example) == dictionary {
       for (suffix, result) in example.pairs() {
-        check-example(puzzle, func, result, suffix: suffix)
+        check-example(day, func, result, suffix: suffix)
       }
     } else {
-      check-example(puzzle, func, example)
+      check-example(day, func, example)
     }
     linebreak()
   }
 
-  let input = get-input(1)
+  let input = get-input(day)
   let result = (func)(input)
   show-result(result)
 }
 
 #let day-template(day, puzzle1, puzzle2, stars: 0) = {
   pagebreak(weak: true)
-  let title = [Day #day] + ((emoji.star,)*stars).join()
+  let title = [Day #day] + box(
+    baseline: -1pt,
+    ((star,)*stars).join()
+  )
+  
   [
     = #title
     #label("day-" + str(day))
@@ -108,7 +130,7 @@
         dir: ttb,
         spacing: 0.2em,
         cell,
-        h(3pt) + ((emoji.star,)* stars.at(str(i))).join()
+        ((star,)* stars.at(str(i))).join()
       )
       if links {
         cell = link(label("day-" + str(i)), cell)