commit e8d93980f59f62d6e372bdb2f66fe32095f91a52 (patch)
parent eb940bc2eb4dcba8b63838d9cb36ccc52f13c58f
Author: Alex Karle <alex@alexkarle.com>
Date: Fri, 3 Dec 2021 00:40:32 -0500
day3: Add python implementation
This was much *much* rougher 20m ago when I finished... I was printing
out the binary strings and plugging them into an online calculator to
beat my friends to the punchline (little did I know int(,2) was so
easy!).
I went back and cleaned it up a bit, but I'm SURE it can be done
better.... I'm just tired :)
Diffstat:
| A | 3/a.py | | | 28 | ++++++++++++++++++++++++++++ |
| A | 3/b.py | | | 45 | +++++++++++++++++++++++++++++++++++++++++++++ |
| A | 3/input | | | 1000 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
3 files changed, 1073 insertions(+), 0 deletions(-)
diff --git a/3/a.py b/3/a.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+import sys
+
+# First get the counts of bit by position
+counts = []
+first = True
+for l in sys.stdin:
+ i = 0
+ for c in l.strip():
+ if first:
+ counts.append([0, 0])
+ counts[i][int(c)] += 1
+ i += 1
+
+ first = False
+
+# Then build up the binary string summaries
+gamma = ""
+eps = ""
+for c in counts:
+ if c[0] > c[1]:
+ gamma += "0"
+ eps += "1"
+ else:
+ gamma += "1"
+ eps += "0"
+
+print(int(gamma, 2) * int(eps, 2))
diff --git a/3/b.py b/3/b.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+import sys
+
+def search(nums, maximum):
+ # idx to consider
+ i = 0
+ while len(nums) > 1:
+ # count just that digit in the string (rest is garbage)
+ counts = [0, 0]
+ for n in nums:
+ counts[int(n[i])] += 1
+
+ # filter the list down to most or least common
+ def addsome(c):
+ for n in nums:
+ if n[i] == c:
+ new.append(n)
+
+ new = []
+ if maximum:
+ if counts[0] > counts[1]:
+ addsome('0')
+ else:
+ addsome('1')
+ else:
+ if counts[0] <= counts[1]:
+ addsome('0')
+ else:
+ addsome('1')
+
+ nums = new
+ i+=1
+
+ return nums[0]
+
+# We need multiple iterations on this one -- save to mem
+if __name__ == '__main__':
+ nums = []
+ for l in sys.stdin:
+ nums.append(l.strip())
+
+ oxygen = int(search(nums, maximum=True), 2)
+ co2 = int(search(nums, maximum=False), 2)
+
+ print(oxygen * co2)
diff --git a/3/input b/3/input
@@ -0,0 +1,1000 @@
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