1 files changed, 85 insertions, 0 deletions

diff --git a/day8/solution.nim b/day8/solution.nim
new file mode 100644
index 0000000..f2c4f23
--- /dev/null
+++ b/day8/solution.nim
@@ -0,0 +1,85 @@
+import std/strutils
+import std/strformat
+import std/sequtils
+import std/algorithm
+import std/sugar
+
+type
+  Tree = tuple
+    height: int
+    found: bool
+
+proc scanTree(tree: Tree, answer: var int, maxHeight: var int): Tree =
+  result = tree
+  if tree.height > maxHeight:
+    maxHeight = tree.height
+    if not tree.found:
+      answer += 1
+      result = (tree.height, true)
+
+proc calculate(row: var seq[Tree], reved = false): int =
+  var
+    answer = 0
+    maxHeight = -1
+    newRow: seq[Tree]
+
+  if reved:
+    newRow = row.reversed()
+  else:
+    newRow = row
+
+  for i, r in newRow:
+    newRow[i] = scanTree(r, answer, maxHeight)
+  row = newRow
+
+  return answer
+
+func part1(content: seq[string]): int =
+  var grid = map(
+    content,
+    (row) => zip(map(row, (c) => ord(c) - ord('0')), newSeq[bool](row.len()))
+  )
+  var answer = 0
+
+  for row in grid.mitems():
+    answer += calculate(row)
+    answer += calculate(row, true)
+
+  for i in 0 ..< grid.len():
+    var col = map(grid, (row) => row[i])
+    answer += calculate(col)
+    answer += calculate(col, true)
+
+  return answer
+
+func checkVisibility(line: seq[int], height: int): int =
+  result = 0
+  for h in line:
+    result += 1
+    if h >= height:
+      return result
+
+  return result
+
+proc part2(content: seq[string]): int =
+  let grid = map(content, (row) => map(row, (c) => ord(c) - ord('0')))
+  result = 0
+
+  for i, row in grid:
+    for j, h in row:
+      var col = map(grid, (row) => row[j])
+      var count = 
+        checkVisibility(row[j+1 .. ^1], h) *
+        checkVisibility(row[0 .. j-1].reversed(), h) *
+        checkVisibility(col[i+1 .. ^1], h) *
+        checkVisibility(col[0 .. i-1].reversed(), h)
+      
+      # echo fmt"{i}, {j} = {count}"
+      result = max(result, count)
+
+  return result
+  
+let content = readFile("./input.txt").strip().splitLines()
+
+echo part1(content)
+echo part2(content)