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-rw-r--r--2019/nim/day01.nim16
-rw-r--r--2019/nim/day02.nim37
-rw-r--r--2019/nim/day04.nim37
-rw-r--r--2019/nim/day05.nim63
-rw-r--r--2019/nim/day08.nim30
5 files changed, 183 insertions, 0 deletions
diff --git a/2019/nim/day01.nim b/2019/nim/day01.nim
new file mode 100644
index 0000000..63c1219
--- /dev/null
+++ b/2019/nim/day01.nim
@@ -0,0 +1,16 @@
+# Day One: The Tyranny of the Rocket Equation
+import os, strutils
+
+let input: string = paramStr(1)
+var sum, fuelsum: int = 0
+
+for mass in lines(input):
+ var fuel = parseInt(mass) div 3 - 2
+ sum += fuel
+ fuelsum += fuel
+ while fuel > 0:
+ fuel = fuel div 3 - 2
+ fuelsum += max(0, fuel)
+
+echo sum
+echo fuelsum
diff --git a/2019/nim/day02.nim b/2019/nim/day02.nim
new file mode 100644
index 0000000..c0bfb9b
--- /dev/null
+++ b/2019/nim/day02.nim
@@ -0,0 +1,37 @@
+# Day Two: 1202 Program Alarm
+import os, strutils, sequtils
+
+let input: string = paramStr(1)
+var program: seq[int] = map(split(strip(readFile(input)), ','), parseInt)
+program[1] = 12
+program[2] = 2
+
+proc execute(program: seq[int]): int =
+ var program: seq[int] = program
+ var i: int = 0
+ while i < len(program):
+ case program[i]
+ of 1:
+ program[program[i+3]] = program[program[i+1]] + program[program[i+2]]
+ i += 4
+ of 2:
+ program[program[i+3]] = program[program[i+1]] * program[program[i+2]]
+ i += 4
+ of 99:
+ break
+ else:
+ echo("Unsupported code ", program[i], " at ", i)
+ quit(QuitFailure)
+ return program[0]
+
+proc grammar(program: seq[int]): int =
+ var program: seq[int] = program
+ for noun in 0 ..< len(program):
+ for verb in 0 ..< len(program):
+ program[1] = noun
+ program[2] = verb
+ if execute(program) == 19690720:
+ return 100 * noun + verb
+
+echo execute(program)
+echo grammar(program)
diff --git a/2019/nim/day04.nim b/2019/nim/day04.nim
new file mode 100644
index 0000000..eb6d933
--- /dev/null
+++ b/2019/nim/day04.nim
@@ -0,0 +1,37 @@
+# Day Four: Secure Container
+import os, strutils, sequtils
+
+let input: string = paramStr(1)
+let bounds: seq[int] = map(split(strip(readFile(input)), '-'), parseInt)
+var valid, details: int = 0
+
+proc criteria(password: int): bool =
+ var password: string = $password
+ for digit in 0 .. 4:
+ if password[digit] > password[digit+1]:
+ return false
+ for digit in 0 .. 4:
+ if password[digit] == password[digit+1]:
+ return true
+ return false
+
+proc extracriteria(password: int): bool =
+ var password: string = $password
+ for digit in 0 .. 4:
+ if password[digit] > password[digit+1]:
+ return false
+ for digit in 0 .. 4:
+ if password[digit] == password[digit+1]:
+ if digit == 0 or password[digit] != password[digit-1]:
+ if digit == 4 or password[digit] != password[digit+2]:
+ return true
+ return false
+
+for password in bounds[0] .. bounds[1]:
+ if criteria(password): inc(valid)
+
+for password in bounds[0] .. bounds[1]:
+ if extracriteria(password): inc(details)
+
+echo valid
+echo details
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)
diff --git a/2019/nim/day08.nim b/2019/nim/day08.nim
new file mode 100644
index 0000000..ecf291e
--- /dev/null
+++ b/2019/nim/day08.nim
@@ -0,0 +1,30 @@
+# Day Eight: Space Image Format
+import os, strutils, sequtils
+
+let
+ input: string = paramStr(1)
+ digits: string = strip(readFile(input))
+ width: int = 25
+ height: int = 6
+ depth: int = len(digits) div (width * height)
+
+var min, product: int = width * height
+for layer in distribute(@digits, depth):
+ if count(layer, '0') < min:
+ min = count(layer, '0')
+ product = count(layer, '1') * count(layer, '2')
+echo product
+
+for column in 0 ..< height:
+ for row in 0 ..< width:
+ for layer in 0 ..< depth:
+ case digits[(layer * height * width) + (column * width) + row]
+ of '0':
+ write(stdout, ' ')
+ break
+ of '1':
+ write(stdout, 'X')
+ break
+ else:
+ discard
+ write(stdout, '\n')