add 02

day02/day02.ps1

@@ -0,0 +1,43 @@
+param(
+    [parameter(mandatory=$true)]
+    $path
+)
+
+$commands = gc $path | % {
+    if ($_ -match '(?<command>forward|up|down) (?<amt>\d+)') {
+        [pscustomobject] @{
+            command = $Matches["command"];
+            amt = [int]$Matches["amt"];
+        }
+    }
+}
+
+echo "question 1"
+
+$position = 0
+$depth = 0
+
+foreach ($c in $commands) {
+    switch ($c.command) {
+        "forward" { $position += $c.amt }
+        "up"      { $depth -= $c.amt }
+        "down"    { $depth += $c.amt }
+    }
+}
+
+echo "position: $position, depth: $depth, answer: $($position * $depth)"
+
+echo "question 2"
+
+$position = 0
+$depth = 0
+$aim = 0
+
+foreach ($c in $commands) {
+    switch ($c.command) {
+        "forward" { $position += $c.amt; $depth += $aim * $c.amt }
+        "up"      { $aim -= $c.amt }
+        "down"    { $aim += $c.amt }
+    }
+}
+echo "position: $position, depth: $depth, answer: $($position * $depth)"

day02/test.txt

@@ -0,0 +1,6 @@
+forward 5
+down 5
+forward 8
+up 3
+down 8
+forward 2