solved day 7 part 1!

brechtje/3/3-1.py

@@ -0,0 +1,27 @@
+input = open("input.txt").read().splitlines()
+
+# line = current line that is being searched
+# start = at what index to start searching
+    # for the first digit: 0
+    # for the second digit: right after the index of the first digit
+# is_first_digit = boolean, True if first digit is being found, False if second digit is being found
+# num_to_find = (next) number to search for in the string (line), starts at 9 decreases when not found
+def find_biggest_num_index(line, start, is_first_digit):
+    index = -1
+    num_to_find = 9
+    while True:
+        index = line.find(str(num_to_find), start)
+        # decrease num_to_find if number is not found
+        # OR we are currently searching for the first digit and the number found is the last char in the string
+        if index == -1 or (is_first_digit and index == len(line) - 1):
+            num_to_find -= 1
+        else:
+            return index
+answer = 0
+
+for line in input:
+    first_digit_index = find_biggest_num_index(line, 0, True)
+    second_digit_index = find_biggest_num_index(line, first_digit_index + 1, False)
+    answer += int(line[first_digit_index] + line[second_digit_index])
+
+print(answer)

brechtje/4/4-1.py

@@ -0,0 +1,34 @@
+input = open('input.txt', 'r').read().splitlines()
+
+surrounding_spaces = [
+    {'x': -1, 'y': -1},
+    {'x': 0, 'y': -1},
+    {'x': 1, 'y': -1},
+    {'x': -1, 'y': 0},
+    {'x': 1, 'y': 0},
+    {'x': -1, 'y': 1},
+    {'x': 0, 'y': 1},
+    {'x': 1, 'y': 1}
+]
+
+answer = 0
+x_max = len(input[0]) - 1
+y_max = len(input) - 1
+
+for y, line in enumerate(input):
+    for x, char in enumerate(line):
+        if char == "@":
+            rolls = 0
+            for space in surrounding_spaces:
+                current_x = x + space['x']
+                current_y = y + space['y']
+                if current_x < 0 or current_y < 0 or current_x > x_max or current_y > y_max:
+                    continue
+                elif input[current_y][current_x] == "@":
+                    rolls += 1
+                if rolls > 3:
+                    break
+            if rolls < 4:
+                answer += 1
+
+print(answer)

brechtje/4/4-2.py

@@ -0,0 +1,45 @@
+raw_input = open('input.txt', 'r').read().splitlines()
+
+input = []
+
+for line in raw_input:
+    input.append(list(line))
+
+surrounding_spaces = [
+    {'x': -1, 'y': -1},
+    {'x': 0, 'y': -1},
+    {'x': 1, 'y': -1},
+    {'x': -1, 'y': 0},
+    {'x': 1, 'y': 0},
+    {'x': -1, 'y': 1},
+    {'x': 0, 'y': 1},
+    {'x': 1, 'y': 1}
+]
+
+prev_answer = 0
+answer = 0
+x_max = len(input[0]) - 1
+y_max = len(input) - 1
+
+while True:
+    for y, line in enumerate(input):
+        for x, char in enumerate(line):
+            if char == "@":
+                rolls = 0
+                for space in surrounding_spaces:
+                    current_x = x + space['x']
+                    current_y = y + space['y']
+                    if current_x < 0 or current_y < 0 or current_x > x_max or current_y > y_max:
+                        continue
+                    elif input[current_y][current_x] == "@":
+                        rolls += 1
+                    if rolls > 3:
+                        break
+                if rolls < 4:
+                    answer += 1
+                    input[y][x] = "."
+    if answer == prev_answer:
+        break
+    prev_answer = answer
+
+print(answer)

brechtje/5/5-1.py

@@ -0,0 +1,19 @@
+input = open('input.txt', 'r').read().splitlines()
+
+ranges = []
+food = []
+answer = 0
+
+for line in input:
+    if '-' in line:
+        ranges.append(list(map(int, line.split('-'))))
+    elif line != '':
+        food.append(int(line))
+
+for item in food:
+    for range in ranges:
+        if range[0] <= item <= range[1]:
+            answer += 1
+            break
+
+print(answer)

brechtje/6/6-1.py

@@ -0,0 +1,45 @@
+input = open('input.txt', 'r').read().splitlines()
+
+nums = []
+
+current_num = ''
+
+for line in input:
+    if current_num != '':
+        if column_index > len(nums) - 1:
+            nums.append([current_num])
+        else:
+            nums[column_index].append(current_num)
+    current_num = ''
+    column_index = 0
+    for char in line:
+        if char == ' ':
+            if current_num != '':
+                if column_index > len(nums) - 1:
+                    nums.append([current_num])
+                    column_index += 1
+                else:
+                    nums[column_index].append(current_num)
+                    column_index += 1
+                current_num = ''
+        else:
+            current_num += char
+
+answer = 0
+
+for column in nums:
+    column_combo = 0
+    if column[-1] == '+':
+        for num in column[:-1]:
+            column_combo += int(num)
+        answer += column_combo
+    elif column[-1] == '*':
+        for num in column[:-1]:
+            if column_combo == 0:
+                column_combo += int(num)
+            else:
+                column_combo *= int(num)
+        answer += column_combo
+
+print(answer)
+    

brechtje/7/7-1.py

@@ -0,0 +1,22 @@
+raw_input = open("input.txt", "r").read().splitlines()
+input = []
+
+for line in raw_input:
+    input.append(list(line))
+
+input[1][input[0].index('S')] = '|'
+
+answer = 0
+
+for y, line in enumerate(input):
+    for x, char in enumerate(line):
+        if y != len(input) - 1:
+            if char == '|' and input[y + 1][x] != '^':
+                input[y + 1][x] = '|'
+            elif char == '|' and input[y + 1][x] == '^':
+                answer += 1
+                input[y + 1][x - 1] = '|'
+                input[y + 1][x + 1] = '|'
+    print(''.join(line))
+    
+print(answer)