day 7

2022/07/01.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+import re
+
+INPUT_FILE = 'input'
+
+cd_pattern = '^\$\scd (.*)$'
+ls_pattern = '^\$ ls$'
+dir_pattern = '^dir .*$'
+file_pattern = '^(\d+) .*$'
+
+def main():
+    content = map(str.strip, open(INPUT_FILE, 'r').readlines())
+    cwd = ['']
+    folders = {}
+    for line in content:
+        if re.match(dir_pattern, line) or re.match(ls_pattern, line):
+            # ignore `dir a` and `$ ls`
+            continue
+        cd = re.match(cd_pattern, line)
+        if cd:
+            new_dir = cd.group(1)
+            if new_dir == '..':
+                cwd.pop()
+            else:
+                cwd.append(new_dir)
+                folders['/'.join(cwd)] = 0
+            print('/'.join(cwd))
+            continue
+        file_match = re.match(file_pattern, line)
+        if file_match:
+            filesize = int(file_match.group(1))
+            for n in range(len(cwd), 0, -1):
+                try:
+                    folders['/'.join(cwd[:n])] += filesize
+                except KeyError:
+                    continue
+
+        else:
+            print('ERROR: No regex matched for {}'.format(line()))
+    print(folders)
+    dir_sum = 0
+    for key in folders.keys():
+        if folders[key] <= 100000:
+            dir_sum += folders[key]
+            print(key, dir_sum)
+    print(dir_sum) 
+
+
+
+if __name__ == '__main__':
+    main()

2022/07/02.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+import re
+
+INPUT_FILE = 'input'
+
+cd_pattern = '^\$\scd (.*)$'
+ls_pattern = '^\$ ls$'
+dir_pattern = '^dir .*$'
+file_pattern = '^(\d+) .*$'
+
+total_space = 70000000
+required_free = 30000000
+
+def main():
+    content = map(str.strip, open(INPUT_FILE, 'r').readlines())
+    cwd = ['']
+    folders = {}
+    for line in content:
+        if re.match(dir_pattern, line) or re.match(ls_pattern, line):
+            # ignore `dir a` and `$ ls`
+            continue
+        cd = re.match(cd_pattern, line)
+        if cd:
+            new_dir = cd.group(1)
+            if new_dir == '..':
+                cwd.pop()
+            else:
+                cwd.append(new_dir)
+                folders['/'.join(cwd)] = 0
+            print('/'.join(cwd))
+            continue
+        file_match = re.match(file_pattern, line)
+        if file_match:
+            filesize = int(file_match.group(1))
+            for n in range(len(cwd), 0, -1):
+                try:
+                    folders['/'.join(cwd[:n])] += filesize
+                except KeyError:
+                    continue
+        else:
+            print('ERROR: No regex matched for {}'.format(line()))
+    print(folders)
+    used_space = folders['//']
+    free_space = total_space - used_space
+    print('total: {} used: {} free: {}'.format(total_space, used_space, free_space))
+    space_needed = required_free - free_space
+    print('Need {}'.format(space_needed))
+    candidates = []
+    for key in folders.keys():
+        if folders[key] >= space_needed:
+            candidates.append(folders[key])
+    print('Result: {}'.format(min(candidates)))
+
+if __name__ == '__main__':
+    main()