From 568fb62cdf41e13e6cbf7fcdb2c8632e7dbbe317 Mon Sep 17 00:00:00 2001
From: Bryce Allen <bdallen@uchicago.edu>
Date: Mon, 6 Dec 2021 16:13:02 -0500
Subject: [PATCH] add day6, day4 inputs

---
 day4input.txt | 601 ++++++++++++++++++++++++++++++++++++++++++++++++++
 day4test.txt  |  19 ++
 day6.jl       |  76 +++++++
 day6input.txt |   1 +
 day6test.txt  |   1 +
 5 files changed, 698 insertions(+)
 create mode 100644 day4input.txt
 create mode 100644 day4test.txt
 create mode 100755 day6.jl
 create mode 100644 day6input.txt
 create mode 100644 day6test.txt

diff --git a/day4input.txt b/day4input.txt
new file mode 100644
index 0000000..09cab01
--- /dev/null
+++ b/day4input.txt
@@ -0,0 +1,601 @@
+93,49,16,88,4,92,23,38,44,98,97,8,5,69,41,70,19,11,29,40,90,43,79,96,68,10,31,35,34,32,0,67,83,33,2,76,24,87,99,77,82,66,12,15,28,59,64,95,91,71,62,22,53,46,39,81,75,86,74,56,50,18,17,73,13,54,60,48,21,51,52,55,85,80,30,36,47,3,26,57,84,25,63,27,37,94,7,45,58,9,78,65,72,6,14,61,20,1,42,89
+
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diff --git a/day4test.txt b/day4test.txt
new file mode 100644
index 0000000..669a51d
--- /dev/null
+++ b/day4test.txt
@@ -0,0 +1,19 @@
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+22 13 17 11  0
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
diff --git a/day6.jl b/day6.jl
new file mode 100755
index 0000000..4e3f4f6
--- /dev/null
+++ b/day6.jl
@@ -0,0 +1,76 @@
+#!/usr/bin/env julia
+
+using DelimitedFiles
+
+infile = size(ARGS, 1) > 0 ? ARGS[1] : "day6input.txt"
+println("infile = ", infile)
+
+fish = vec(readdlm(infile, ',', Int))
+
+function simulate_lanternfish(fish, days)
+    fish = copy(fish)
+    for day in 1:days
+        newfish = 0
+        for i in 1:length(fish)
+            fish[i] -= 1
+            if fish[i] < 0
+                fish[i] = 6
+                newfish += 1
+            end
+        end
+        append!(fish, repeat([8], newfish))
+    end
+    return fish
+end
+
+fish18 = simulate_lanternfish(fish, 18)
+fish80 = simulate_lanternfish(fish18, 80-18)
+
+println("18 : ", length(fish18))
+println("80 : ", length(fish80))
+
+using OffsetArrays
+
+function simulate2(fish, days)
+    fish_map = OffsetVector(zeros(Int, 9), 0:8)
+    for i in 1:length(fish)
+        fish_map[fish[i]] += 1
+    end
+    for day in 1:days
+        add_next = 0
+        for c in 8:-1:0
+            tmp = fish_map[c]
+            fish_map[c] = add_next
+            add_next = tmp
+        end
+        fish_map[8] = add_next
+        fish_map[6] += add_next
+    end
+    return sum(fish_map)
+end
+
+function simulate3(fish, days)
+    fish_map = zeros(Int, 9)
+    for i in 1:length(fish)
+        fish_map[fish[i]+1] += 1
+    end
+    for day in 1:days
+        fish_map = circshift(fish_map, -1)
+        fish_map[7] += fish_map[9]
+    end
+    return sum(fish_map)
+end
+
+
+println("18 : ", simulate2(fish, 18))
+println("80 : ", simulate2(fish, 80))
+println("256: ", simulate2(fish, 256))
+
+println("18 : ", simulate3(fish, 18))
+println("80 : ", simulate3(fish, 80))
+println("256: ", simulate3(fish, 256))
+
+using BenchmarkTools
+
+@btime simulate2(fish, 256)
+@btime simulate3(fish, 256)
diff --git a/day6input.txt b/day6input.txt
new file mode 100644
index 0000000..c696217
--- /dev/null
+++ b/day6input.txt
@@ -0,0 +1 @@
+1,3,4,1,1,1,1,1,1,1,1,2,2,1,4,2,4,1,1,1,1,1,5,4,1,1,2,1,1,1,1,4,1,1,1,4,4,1,1,1,1,1,1,1,2,4,1,3,1,1,2,1,2,1,1,4,1,1,1,4,3,1,3,1,5,1,1,3,4,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,5,2,5,5,3,2,1,5,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,5,1,1,1,1,5,1,1,1,1,1,4,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,3,1,2,4,1,5,5,1,1,5,3,4,4,4,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,1,5,3,1,4,1,1,2,2,1,2,2,5,1,1,1,2,1,1,1,1,3,4,5,1,2,1,1,1,1,1,5,2,1,1,1,1,1,1,5,1,1,1,1,1,1,1,5,1,4,1,5,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,5,4,5,1,1,1,1,1,1,1,5,1,1,3,1,1,1,3,1,4,2,1,5,1,3,5,5,2,1,3,1,1,1,1,1,3,1,3,1,1,2,4,3,1,4,2,2,1,1,1,1,1,1,1,5,2,1,1,1,2
diff --git a/day6test.txt b/day6test.txt
new file mode 100644
index 0000000..55129f1
--- /dev/null
+++ b/day6test.txt
@@ -0,0 +1 @@
+3,4,3,1,2