Day 4

day3.py

@@ -8,10 +8,14 @@
     input = file.read().split("\n")
 
 
-input = [(sack[0:len(sack)//2], sack[len(sack)//2:]) for sack in input]
+input = [(sack[0:len(sack)//2], sack[len(sack)//2:]) for sack in input] #split in half
 
 
 def getPriority(letter):
+    """
+    Calculate the priority of a letter char
+    
+    """
     return ord(letter)-ord("a")+1 if letter.islower() else ord(letter)-ord("A")+27
 
 
@@ -20,7 +24,7 @@ def getPriority(letter):
 for sack in input:
     print(sack)
     for letter in sack[0]:
-        if letter in sack[1]:
+        if letter in sack[1]: #check if letter in other sack
                 score += getPriority(letter)
                 break
 print(score)

day3_2.py

@@ -11,13 +11,17 @@
 
 
 def getPriority(letter):
+    """
+    Calculate the priority of a letter char
+    
+    """
     return ord(letter)-ord("a")+1 if letter.islower() else ord(letter)-ord("A")+27
 
 
 score = 0
-for i in range(0, len(input),3):
+for i in range(0, len(input),3): #skip over the input indicies in steps of 3
     for letter in input[i]:
-        if letter in input[i+1] and letter in input[i+2]:
+        if letter in input[i+1] and letter in input[i+2]: #check if letter in both sacks
             score += getPriority(letter)
             break
 print(score)

day4.py

@@ -0,0 +1,32 @@
+"""
+Advent of Code 2022 - Day 4
+
+Notes:
+Time: ~6 minutes
+map() is useful, worth praciting. Couldve killed lines 14-18 and simplifed the rest
+
+"""
+with open("day4.txt", "r") as file:
+    input = file.read().split("\n")
+
+contained = 0
+for line in input:
+    #split into groups of ints for each elf
+    split1 = line.split(",")
+    elf1 = split1[0].split("-")
+    elf2 = split1[1].split("-")
+    elf1 = [int(elf1[0]), int(elf1[1])]
+    elf2 = [int(elf2[0]), int(elf2[1])]
+
+    #check if both values for elf2 are contained in elf1, and vice versa
+    #change the ors to ands for part 1
+    if elf1[0] <= elf2[0] <= elf1[1] or elf1[0] <= elf2[1] <= elf1[1]:
+        contained += 1
+    elif elf2[0] <= elf1[0] <= elf2[1] or elf2[0] <= elf1[1] <= elf2[1]:
+        contained += 1
+print(contained)
+
+
+
+
+