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2021/four.nim

@@ -1,11 +1,61 @@
-import std/[strutils, sequtils, options, math, parseutils]
+import std/[strutils, sequtils, options, math, parseutils, sets]
 import ./common
 
+type Board = object
+  entries: seq[string]
+  checked: seq[int]
+
+let winningSets = [
+  [0, 1, 2, 3, 4],
+  [5, 6, 7, 8, 9],
+  [10, 11, 12, 13, 14],
+  [15, 16, 17, 18, 19],
+  [20, 21, 22, 23, 24],
+  [0, 5, 10, 15, 20],
+  [1, 6, 11, 16, 21],
+  [2, 7, 12, 17, 22],
+  [3, 8, 13, 18, 23],
+  [4, 9, 14, 19, 24]
+].mapIt(it.toHashSet())
+
+proc isBoardWinning(b: ref Board): bool =
+  let s = b.checked.toHashSet()
+  for w in winningSets:
+    if w < s:
+      return true
+  return false
+
+
 proc squidBingo(inputLines: seq[string]): int =
   var input: seq[string] = inputLines
-  let calledNumbers: seq[string] = input[0].split(',')
-  input.delete(0..1)
+  let calledNumbers: seq[string] = input[0].split ','
+  input.delete 0..1
+
   echo calledNumbers
+
+  # construct boards
+  var boards: seq[Board]
+  var board: Board = Board(entries: @[], checked: @[])
+  for l in input:
+    echo l
+    if l.strip() == "":
+      boards.add board
+      echo board.entries
+      board = Board(entries: @[], checked: @[])
+      continue
+    board.entries.add [l[0..1], l[3..4], l[6..7], l[9..10], l[12..13]].mapIt(it.strip())
+    
+  for n in calledNumbers:
+    for b in boards:
+      for i, e in b.entries:
+        if n == e:
+          # TODO: why can't I add here but I can add on 46?!
+          b.checked.add i
+      if b.isBoardWinning():
+        # TODO: get unchecked entries
+        # TODO: multiple their sum with last .checked
+        return 9
+
   return 0
 
 let input = 4.loadInput()
@@ -13,8 +63,7 @@ time("squidBingo part 1"): echo input.squidBingo()
 
 when not defined(release):
   static:
-    let testInput = """
-    7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+    let testInput = """7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
 
 22 13 17 11  0
  8  2 23  4 24
@@ -32,6 +81,5 @@ when not defined(release):
 10 16 15  9 19
 18  8 23 26 20
 22 11 13  6  5
-     2  0 12  3  7
-    """.strip().split('\n')
+ 2  0 12  3  7""".split('\n')
     doAssert testInput.squidBingo() == 4512