2022/10/both.nim

@@ -0,0 +1,77 @@
+import
+  std/strutils
+
+import
+  ../../adventofcode
+
+when not defined(second):
+  import
+    std/strformat
+
+let input = adventofcode.getInput()
+let instructions = input.splitLines()
+
+var registerX = 1
+var currOpIdx = 0
+var currOp = ""
+var currOpArg = 0
+var sameOpN = 0
+proc endOp() =
+  reset currOp
+  reset currOpArg
+  reset sameOpN
+  currOpIdx.inc()
+
+when not defined(second):
+  const rangeEnd = 220
+  var answer = 0
+else:
+  const rangeEnd = high(int)
+  var crtOutput = ""
+
+for n in 1 .. rangeEnd:
+  when not defined(second):
+    if (n + 20) mod 40 == 0:
+      when not defined(release):
+        echo fmt"{ n = }, { registerX = }"
+      answer += n * registerX
+  else:
+    # Because the cycle count `n` starts at 1
+    let a = n - 1
+
+    # Only generate a 40x6 image
+    if a < 40 * 6:
+      if a mod 40 == 0:
+        crtOutput.add '\n'
+
+      if a mod 40 in registerX - 1 .. registerX + 1:
+        crtOutput.add '#'
+      else:
+        crtOutput.add '.'
+
+  if currOp == "":
+    if currOpIdx > high instructions:
+      break
+    let opArgs = splitWhitespace instructions[currOpIdx]
+    currOp = opArgs[0]
+    if opArgs.len() == 2:
+      currOpArg = parseInt opArgs[1]
+
+  case currOp
+  of "addx":
+    if sameOpN == 1:
+      registerX += currOpArg
+      endOp()
+  of "noop":
+    endOp()
+  else:
+    discard
+
+  if currOp != "":
+    sameOpN.inc()
+
+
+when not defined(second):
+  echo fmt"Answer: {answer}"
+else:
+  echo crtOutput