day2

day2/day2.jl

@@ -0,0 +1,35 @@
+#!/usr/bin/env julia
+
+infile = size(ARGS, 1) > 0 ? ARGS[1] : "day2input.txt"
+println("infile = ", infile)
+
+a_move_value = Dict("A"=>1, "B"=>2, "C"=>3)
+x_move_value = Dict("X"=>1, "Y"=>2, "Z"=>3)
+function score(opponent, self)
+  global a_move_value, x_move_value
+  oval = a_move_value[opponent]
+  sval = x_move_value[self]
+
+  diff = sval - oval
+
+  if diff == 0
+    # tie
+    return 3 + sval
+  elseif (diff == 1 || diff == -2)
+    # win
+    return 6 + sval
+  else
+    # loss
+    return sval
+  end
+end
+
+io = open(infile, "r")
+total = 0
+for line in eachline(io)
+  global total
+  o, s = split(line)
+  total += score(o, s)
+end
+
+println(total)

day2/day2b.jl

@@ -0,0 +1,33 @@
+#!/usr/bin/env julia
+
+infile = size(ARGS, 1) > 0 ? ARGS[1] : "day2input.txt"
+println("infile = ", infile)
+
+a_move_value = Dict("A"=>1, "B"=>2, "C"=>3)
+function score(opponent, self)
+  oval = a_move_value[opponent]
+
+  if self == "X"
+    # need to lose
+    sval = 1 + mod(oval - 2, 3)
+    return sval
+  elseif self == "Y"
+    # need to tie
+    sval = oval
+    return 3 + sval
+  else
+    # need to win
+    sval = 1 + mod(oval, 3)
+    return 6 + sval
+  end
+end
+
+io = open(infile, "r")
+total = 0
+for line in eachline(io)
+  global total
+  o, s = split(line)
+  total += score(o, s)
+end
+
+println(total)