day1: don't keep calories array

day1/day1.jl

@@ -7,23 +7,23 @@ println("infile = ", infile)
 N = parse(Int64, Ns)
 
 max_calories = zeros(Int64, N)
-elf_calories = zeros(Int64, 1)
+elf_calories = 0
 i = 1
 
 io = open(infile, "r")
 for line in eachline(io)
   global i, max_calories, max_elf_idx, elf_calories
   if length(line) == 0
-    if elf_calories[i] > max_calories[1]
-      max_calories[1] = elf_calories[i]
+    if elf_calories > max_calories[1]
+      max_calories[1] = elf_calories
       sort!(max_calories)
     end
     i += 1
-    push!(elf_calories, 0)
+    elf_calories = 0
     continue
   end
   snack_calories = parse(Int64, line)
-  elf_calories[i] += snack_calories
+  elf_calories += snack_calories
 end
 
 println(max_calories)