Reorganize 2019 solutions

1 files changed, 63 insertions, 0 deletions

diff --git a/2019/nim/day05.nim b/2019/nim/day05.nim
new file mode 100644
index 0000000..87c359e
--- /dev/null
+++ b/2019/nim/day05.nim
@@ -0,0 +1,63 @@
+# Day Five: Sunny with a Chance of Asteroids
+import os, strutils, sequtils
+
+let input: string = paramStr(1)
+var program: seq[int] = map(split(strip(readFile(input)), ','), parseInt)
+
+var i: int = 0
+while i < len(program):
+  let opcode: int = program[i] mod 100
+
+  var
+    mode:  int = program[i] div 100
+    one:   int = i+1
+    two:   int = i+2
+    three: int = i+3
+  if len(program)-i > 1 and mode mod 10 == 0:
+    one = program[one]
+  if len(program)-i > 2 and mode div 10 mod 10 == 0:
+    two = program[two]
+  if len(program)-i > 3 and mode div 100 == 0:
+    three = program[three]
+
+  case opcode
+  of 1:   # adds
+    program[three] = program[one] + program[two]
+    i += 4
+  of 2:   # multiplies
+    program[three] = program[one] * program[two]
+    i += 4
+  of 3:   # input
+    write(stdout, "Input: ")
+    program[one] = parseInt(readLine(stdin))
+    i += 2
+  of 4:   # output
+    echo program[one]
+    i += 2
+  of 5:   # jump-if-true
+    if program[one] != 0:
+      i = program[two]
+    else:
+      i += 3
+  of 6:   # jump-if-false
+    if program[one] == 0:
+      i = program[two]
+    else:
+      i += 3
+  of 7:   # less than
+    if program[one] < program[two]:
+      program[three] = 1
+    else:
+      program[three] = 0
+    i += 4
+  of 8:   # equals
+    if program[one] == program[two]:
+      program[three] = 1
+    else:
+      program[three] = 0
+    i += 4
+  of 99:  # terminate
+    break
+  else:
+    echo("Unsupported code ", program[i], " at ", i)
+    quit(QuitFailure)