From 2df9ab79138db9ae1b9f8465299ee80e892e3f64 Mon Sep 17 00:00:00 2001
From: Jake <jake@jakecharman.co.uk>
Date: Fri, 3 Dec 2021 08:47:35 +0000
Subject: [PATCH] Completed day 3, task 2

---
 Day-3/day3-2.py | 67 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 Day-3/day3-2.py

diff --git a/Day-3/day3-2.py b/Day-3/day3-2.py
new file mode 100644
index 0000000..9cf76b6
--- /dev/null
+++ b/Day-3/day3-2.py
@@ -0,0 +1,67 @@
+#!/usr/bin/python3
+
+# Variables to hold our totals.
+keptNumbers = []
+co2 = 0
+o2 = 0
+
+# Read in the input file. Split the file up into an array.
+rawValues = []
+with open('input.txt', 'r') as inputFile:
+    for line in inputFile:
+        rawValues.append(line.strip('\n'))
+
+# Loop through twice, collecting the opposite set of results each time.
+for i in range(0,2):
+    values = rawValues
+    mostPopular=0
+
+    # Determine the most popular bit.
+    for bit in range(0, len(values[0])):
+        currentBitCount = 0
+        for value in values:
+            currentBitCount = currentBitCount + int(value[bit])
+        
+        # Keep values which contain the most popular bit.
+        if((len(values) - currentBitCount) < currentBitCount):
+            mostPopular = 1
+            for value in values:
+                if(value[bit] == str(mostPopular) and i == 1):
+                    keptNumbers.append(value)
+                elif(value[bit] != str(mostPopular) and i == 0):
+                    keptNumbers.append(value)
+
+        elif((len(values) - currentBitCount) > currentBitCount):
+            mostPopular = 0
+            for value in values:
+                if(value[bit] == str(mostPopular) and i == 1):
+                    keptNumbers.append(value)
+                elif(value[bit] != str(mostPopular) and i == 0):
+                    keptNumbers.append(value)
+
+        elif((len(values) - currentBitCount) == currentBitCount):
+            for value in values:
+                if(value[bit] == str(i)):
+                    keptNumbers.append(value)
+
+        values = keptNumbers
+        keptNumbers = []
+
+        # Break if we only have one value left.
+        if(len(values) == 1):
+            break
+
+    # Put the value in the right variable.
+    if(i == 0):
+        co2 = values[0]
+    elif(i == 1):
+        o2 = values[0]
+
+# Convert the binary numbers to ints.
+o2Int = int(o2, 2)
+co2Int = int(co2, 2)
+
+# Print results.
+print("O2 Generator reading is " + str(o2) + " (" + str(o2Int) + ")")
+print("CO2 Scrubber reading is " + str(co2) + " (" + str(co2Int) + ")")
+print("The readings multipied together is " + str(o2Int * co2Int))
\ No newline at end of file