From f3e12ea38799f4331537247a05132b915abc86ba Mon Sep 17 00:00:00 2001
From: tristan <tristanbeedell@protonmail.com>
Date: Sun, 6 Dec 2020 14:25:47 +0000
Subject: [PATCH] 2020 day 5 and 6

---
 2020/05/part1.js  |   39 +
 2020/05/part2.js  |   39 +
 2020/06/input.txt | 2093 +++++++++++++++++++++++++++++++++++++++++++++
 2020/06/part1.js  |   21 +
 2020/06/part2.js  |   21 +
 README.md         |    2 +
 6 files changed, 2215 insertions(+)
 create mode 100644 2020/05/part1.js
 create mode 100644 2020/05/part2.js
 create mode 100644 2020/06/input.txt
 create mode 100644 2020/06/part1.js
 create mode 100644 2020/06/part2.js

diff --git a/2020/05/part1.js b/2020/05/part1.js
new file mode 100644
index 0000000..086ea5a
--- /dev/null
+++ b/2020/05/part1.js
@@ -0,0 +1,39 @@
+const fs = require('fs');
+
+const data = fs.readFileSync('input.txt', 'utf-8');
+const lines = data.split('\n');
+
+let max = 0
+// who really needs semicolons anyway
+for (let i = 0; i < lines.length; i++) {
+  let line = lines[i]
+  let rowCode = line.substring(0, 7).replace(/F/g, "0").replace(/B/g, "1")
+  let colCode = line.substring(7).replace(/L/g, "0").replace(/R/g, "1")
+
+  // another excuse to flex that recursive muscle
+  function getIndexFromBSP (BSP, min, max) {
+    if (BSP.length != 1) { 
+      [min, max] = getIndexFromBSP (BSP.substring(0, BSP.length-1), min, max)
+    }
+
+    switch (BSP[BSP.length-1]) {
+      case '0':
+        max = Math.floor((min + max) / 2)
+        break
+      case '1':
+        min = Math.ceil((min + max) / 2)
+        break
+      default:
+        console.log("something went wrong")
+    }
+
+    return [min, max]
+  }
+  let row = getIndexFromBSP(rowCode, 0, 127)[0]
+  let col = getIndexFromBSP(colCode, 0, 7)[0]
+
+  let seatID = (row * 8) + col
+
+  max = seatID > max ? seatID : max
+}
+console.log(max)
\ No newline at end of file
diff --git a/2020/05/part2.js b/2020/05/part2.js
new file mode 100644
index 0000000..605b8f6
--- /dev/null
+++ b/2020/05/part2.js
@@ -0,0 +1,39 @@
+const fs = require('fs');
+
+const data = fs.readFileSync('input.txt', 'utf-8');
+const lines = data.split('\n');
+
+let seats = []
+// who really needs semicolons anyway
+for (let i = 0; i < lines.length; i++) {
+  let line = lines[i]
+  let rowCode = line.substring(0, 7).replace(/F/g, "0").replace(/B/g, "1")
+  let colCode = line.substring(7).replace(/L/g, "0").replace(/R/g, "1")
+
+  // another excuse to flex that recursive muscle
+  function getIndexFromBSP (BSP, min, max) {
+    if (BSP.length != 1) { 
+      [min, max] = getIndexFromBSP (BSP.substring(0, BSP.length-1), min, max)
+    }
+
+    switch (BSP[BSP.length-1]) {
+      case '0':
+        max = Math.floor((min + max) / 2)
+        break
+      case '1':
+        min = Math.ceil((min + max) / 2)
+        break
+      default:
+        console.log("something went wrong")
+    }
+
+    return [min, max]
+  }
+  let row = getIndexFromBSP(rowCode, 0, 127)[0]
+  let col = getIndexFromBSP(colCode, 0, 7)[0]
+
+  seats [row] = seats[row] || []
+  seats [row] [col] = (row*8)+col
+}
+// i just scrolled thru and found the one empty seat
+console.log(seats.filter(row => row.length>7))
\ No newline at end of file
diff --git a/2020/06/input.txt b/2020/06/input.txt
new file mode 100644
index 0000000..962a618
--- /dev/null
+++ b/2020/06/input.txt
@@ -0,0 +1,2093 @@
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\ No newline at end of file
diff --git a/2020/06/part1.js b/2020/06/part1.js
new file mode 100644
index 0000000..23e93b0
--- /dev/null
+++ b/2020/06/part1.js
@@ -0,0 +1,21 @@
+const fs = require('fs');
+
+const data = fs.readFileSync('test.txt', 'utf-8');
+const groups = data.split('\n\n');
+
+let sum = 0
+for (let g = 0; g<groups.length; g++){
+  let group = groups[g]
+  // ignore spaces and new lines; we don't care about that
+  group = group.replace(/[ \n]/gm, "")
+
+  // list of seen chars
+  let chars = []
+  for (let i = 0; i < group.length; i++) {
+    // if not already seen, add to list of seen chars
+    if (!chars.find(char => char == group[i])) { chars.push(group[i]) }
+  }
+  // keep a sum for our puzzle answer
+  sum += chars.length
+}
+console.log(sum)
\ No newline at end of file
diff --git a/2020/06/part2.js b/2020/06/part2.js
new file mode 100644
index 0000000..3c9049a
--- /dev/null
+++ b/2020/06/part2.js
@@ -0,0 +1,21 @@
+const fs = require('fs');
+
+const data = fs.readFileSync('input.txt', 'utf-8');
+const groups = data.split('\n\n');
+
+let sum = 0
+for (let g = 0; g<groups.length; g++){
+  // list of people in group
+  let group = groups[g].split('\n')
+  // first person
+  let first = group[0]
+
+  // for each of the first person's answers
+  for (let answer = 0; answer < first.length; answer++) {
+    // if the total amount of that answer in the group is equal to the amount of people in the group, then everyone in the group answered that question
+    if (group.length == [...groups[g].matchAll(first[answer])].length) {
+      sum++
+    }
+  }
+}
+console.log(sum)
\ No newline at end of file
diff --git a/README.md b/README.md
index 42aec90..bb066dd 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,8 @@ if (advent) {
 2. [:star: :star:](https://adventofcode.com/2020/day/2 "see puzzle")
 3. [:star: :star:](https://adventofcode.com/2020/day/3 "see puzzle")
 4. [:star: :star:](https://adventofcode.com/2020/day/4 "see puzzle")
+5. [:star: :star:](https://adventofcode.com/2020/day/5 "see puzzle")
+6. [:star: :star:](https://adventofcode.com/2020/day/6 "see puzzle")
 
 ## Languages Used
 * Python