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# Day 7: No Space Left On Device
You can hear birds chirping and raindrops hitting leaves as the expedition proceeds. Occasionally, you can even hear
much louder sounds in the distance; how big do the animals get out here, anyway?
The device the Elves gave you has problems with more than just its communication system. You try to run a system update:
```shell
$ system-update --please --pretty-please-with-sugar-on-top
Error: No space left on device
```
Perhaps you can delete some files to make space for the update?
You browse around the filesystem to assess the situation and save the resulting terminal output (your puzzle input). For
example:
``` shell
$ cd /
$ ls
dir a
14848514 b.txt
8504156 c.dat
dir d
$ cd a
$ ls
dir e
29116 f
2557 g
62596 h.lst
$ cd e
$ ls
584 i
$ cd ..
$ cd ..
$ cd d
$ ls
4060174 j
8033020 d.log
5626152 d.ext
7214296 k
```
The filesystem consists of a tree of files (plain data) and directories (which can contain other directories or files).
The outermost directory is called `/`. You can navigate around the filesystem, moving into or out of directories and
listing the contents of the directory you're currently in.
Within the terminal output, lines that begin with `$` are **commands you executed**, very much like some modern
computers:
- `cd` means **change directory**. This changes which directory is the current directory, but the specific result
depends on the argument:
- `cd x` moves in one level: it looks in the current directory for the directory named x and makes it the current
directory.
- `cd ..` moves **out** one level: it finds the directory that contains the current directory, then makes that
directory the current directory.
- `cd /` switches the current directory to the outermost directory, `/`.
- `ls` means **list**. It prints out all the files and directories immediately contained by the current directory:
- `123 abc` means that the current directory contains a file named `abc` with size `123`.
- `dir xyz` means that the current directory contains a directory named `xyz`.
Given the commands and output in the example above, you can determine that the filesystem looks visually like this:
```shell
- / (dir)
- a (dir)
- e (dir)
- i (file, size=584)
- f (file, size=29116)
- g (file, size=2557)
- h.lst (file, size=62596)
- b.txt (file, size=14848514)
- c.dat (file, size=8504156)
- d (dir)
- j (file, size=4060174)
- d.log (file, size=8033020)
- d.ext (file, size=5626152)
- k (file, size=7214296)
```
Here, there are four directories: `/` (the outermost directory), `a` and `d` (which are in `/`), and `e` (which is in
`a`). These directories also contain files of various sizes.
Since the disk is full, your first step should probably be to find directories that are good candidates for deletion. To
do this, you need to determine the **total size** of each directory. The total size of a directory is the sum of the
sizes of the files it contains, directly or indirectly. (Directories themselves do not count as having any intrinsic
size.)
The total sizes of the directories above can be found as follows:
- The total size of directory `e` is **584** because it contains a single file `i` of size 584 and no other directories.
- The directory `a` has total size **94853** because it contains files `f` (size 29116), `g` (size 2557), and `h.lst` (
size 62596), plus file `i` indirectly (`a` contains `e` which contains `i`).
- Directory `d` has total size **24933642**.
- As the outermost directory, `/` contains every file. Its total size is **48381165**, the sum of the size of every
file.
To begin, find all of the directories with a total size of **at most 100000**, then calculate the sum of their total
sizes. In the example above, these directories are a and e; the sum of their total sizes is **95437** (94853 + 584). (As
in this example, this process can count files more than once!)
Find all of the directories with a total size of at most 100000. **What is the sum of the total sizes of those
directories?**
## Part Two
Now, you're ready to choose a directory to delete.
The total disk space available to the filesystem is `70000000`. To run the update, you need unused space of at least
`30000000`. You need to find a directory you can delete that will **free up enough space** to run the update.
In the example above, the total size of the outermost directory (and thus the total amount of used space) is `48381165`;
this means that the size of the **unused** space must currently be `21618835`, which isn't quite the `30000000` required
by the update. Therefore, the update still requires a directory with total size of at least `8381165` to be deleted
before it can run.
To achieve this, you have the following options:
- Delete directory `e`, which would increase unused space by `584`.
- Delete directory `a`, which would increase unused space by `94853`.
- Delete directory `d`, which would increase unused space by `24933642`.
- Delete directory `/`, which would increase unused space by `48381165`.
Directories `e` and `a` are both too small; deleting them would not free up enough space. However, directories `d`
and `/` are both big enough! Between these, choose the **smallest**: `d`, increasing unused space by **24933642**.
Find the smallest directory that, if deleted, would free up enough space on the filesystem to run the update.\
**What is the total size of that directory?**

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$ cd /
$ ls
dir fcqv
dir fcv
72939 hdpgfcwd
236918 jlncjqh.csz
dir jvwfwrg
dir tzwpllhq
dir vglf
28586 wzljr.zvp
$ cd fcqv
$ ls
dir fhg
277152 qldfrhm.qnr
269351 qsd
dir thbb
$ cd fhg
$ ls
dir jljrdvw
$ cd jljrdvw
$ ls
101940 vsvgjg.tpn
$ cd ..
$ cd ..
$ cd thbb
$ ls
144311 cchngzcc.lcd
178246 fbsj.wtl
48521 gfsqtssb.vtg
284713 jwl.hll
96717 wdqqqv.pcr
$ cd ..
$ cd ..
$ cd fcv
$ ls
dir ffhwwg
275505 fprcz.hrd
179689 jwn
69265 tfnws.drt
38365 twvt.dbs
dir vcqsrw
247592 zldbq
dir znzpm
$ cd ffhwwg
$ ls
dir hlqf
$ cd hlqf
$ ls
30443 vrdbrwp.dss
$ cd ..
$ cd ..
$ cd vcqsrw
$ ls
dir bzlnsjmv
dir rvbtnz
224487 slr
255340 vrdbrwp.dss
$ cd bzlnsjmv
$ ls
272548 qwqlzvzv
$ cd ..
$ cd rvbtnz
$ ls
165670 jwl.lhn
$ cd ..
$ cd ..
$ cd znzpm
$ ls
dir mjwnsw
$ cd mjwnsw
$ ls
219638 bzcb
$ cd ..
$ cd ..
$ cd ..
$ cd jvwfwrg
$ ls
dir ffhwwg
42104 hmphb.qvq
dir hzjpg
dir jwl
dir nmz
243217 qldfrhm.rws
dir tdjtv
dir wdn
$ cd ffhwwg
$ ls
179995 hcbf.dhw
176263 lgssjp.mnl
$ cd ..
$ cd hzjpg
$ ls
241535 ddlcslcs.zjh
dir ddrwfq
dir mqwww
29329 qwqlzvzv
91380 vrdbrwp.dss
dir wctwz
210633 wdqqqv.pcr
dir wlrmbtdg
172051 zldbq
$ cd ddrwfq
$ ls
11756 ffhwwg
$ cd ..
$ cd mqwww
$ ls
149750 wlfmbv.cgp
$ cd ..
$ cd wctwz
$ ls
277720 qldfrhm.bph
$ cd ..
$ cd wlrmbtdg
$ ls
14154 ffhwwg
dir hgdjv
dir qldfrhm
48920 qwqlzvzv
101228 wdqqqv.pcr
159676 zldbq
$ cd hgdjv
$ ls
dir hlw
$ cd hlw
$ ls
229687 cdzwfzww.wcv
$ cd ..
$ cd ..
$ cd qldfrhm
$ ls
254189 nfbp.gcg
$ cd ..
$ cd ..
$ cd ..
$ cd jwl
$ ls
277778 drtw
dir ghgf
dir gqlmq
163875 jwl.pmm
dir mjm
dir qgq
$ cd ghgf
$ ls
181540 zsgjptrm.thf
$ cd ..
$ cd gqlmq
$ ls
dir ffhwwg
283989 hzpwn
dir jwl
dir pqdqntr
62581 vrdbrwp.dss
$ cd ffhwwg
$ ls
242533 qwqlzvzv
21991 wdqqqv.pcr
$ cd ..
$ cd jwl
$ ls
179926 jfgbmb.qsd
dir zjv
$ cd zjv
$ ls
102693 ffhwwg.hrt
$ cd ..
$ cd ..
$ cd pqdqntr
$ ls
159376 nqwcsdmv
$ cd ..
$ cd ..
$ cd mjm
$ ls
273410 hdbmpnfv
8169 qwqlzvzv
87728 tfgq.vbt
221237 vrdbrwp.dss
$ cd ..
$ cd qgq
$ ls
dir dgq
dir hlw
164971 jvwfwrg
dir jwl
158534 qftjvcz.pfv
251561 qzzpmh
282035 wsz
$ cd dgq
$ ls
dir ffhwwg
237291 nfqzn
70142 qfnrvmp.vbb
55607 zldbq
$ cd ffhwwg
$ ls
117790 sqhrdmd.thc
186465 tfctr.scc
236863 wdqqqv.pcr
$ cd ..
$ cd ..
$ cd hlw
$ ls
244567 wrnplfgg.pcw
$ cd ..
$ cd jwl
$ ls
105997 lpsg.jjl
$ cd ..
$ cd ..
$ cd ..
$ cd nmz
$ ls
51802 qwqlzvzv
128617 zldbq
$ cd ..
$ cd tdjtv
$ ls
dir jvwfwrg
dir mdmwf
dir rlpbrq
$ cd jvwfwrg
$ ls
35406 wdqqqv.pcr
$ cd ..
$ cd mdmwf
$ ls
dir ffhwwg
15609 rdpwqw.pfv
205721 zldbq
$ cd ffhwwg
$ ls
117473 hdcv.cwj
$ cd ..
$ cd ..
$ cd rlpbrq
$ ls
120058 dgddvmt.fnv
194704 ffhwwg
256467 qwqlzvzv
$ cd ..
$ cd ..
$ cd wdn
$ ls
170094 bzqsnv
dir gqmghw
150252 gwgz.fnf
243953 jfgbmb.qsd
123382 qwqlzvzv
96220 wpc.swm
dir ztqbhjr
$ cd gqmghw
$ ls
dir tlgbcrh
$ cd tlgbcrh
$ ls
281457 ztjhcrwf.ljf
$ cd ..
$ cd ..
$ cd ztqbhjr
$ ls
271212 jfgbmb.qsd
dir nbhq
dir vfmmj
260079 vrdbrwp.dss
$ cd nbhq
$ ls
179096 hlw.hrh
150184 wdqqqv.pcr
$ cd ..
$ cd vfmmj
$ ls
57445 hlw.pfb
40329 qldfrhm
$ cd ..
$ cd ..
$ cd ..
$ cd ..
$ cd tzwpllhq
$ ls
33596 cmwwd
16963 hlw.jrw
161107 hlw.npq
dir jwv
152431 nqf.jjg
dir qldfrhm
dir swmwvl
dir wzpth
$ cd jwv
$ ls
dir bgswd
188795 hlw
dir jvwfwrg
dir jwl
dir mbcb
dir qldfrhm
30173 qwqlzvzv
193577 zldbq
$ cd bgswd
$ ls
dir hdgt
216966 ldbg.dzh
$ cd hdgt
$ ls
70441 fnv.bpl
$ cd ..
$ cd ..
$ cd jvwfwrg
$ ls
dir mctsws
69374 qldfrhm
$ cd mctsws
$ ls
257337 qsgvbj
$ cd ..
$ cd ..
$ cd jwl
$ ls
161061 ffhwwg
$ cd ..
$ cd mbcb
$ ls
dir fbhhq
dir rgjwh
$ cd fbhhq
$ ls
dir vnn
$ cd vnn
$ ls
55629 cthtjm.wbt
$ cd ..
$ cd ..
$ cd rgjwh
$ ls
7826 wrhpmqd.fvw
$ cd ..
$ cd ..
$ cd qldfrhm
$ ls
14471 hlw.lwh
163165 jnpgzcmt
10880 qwqlzvzv
$ cd ..
$ cd ..
$ cd qldfrhm
$ ls
dir ffhwwg
dir jwl
15164 ldmm
188544 pwg.zsf
255566 qjlggt
dir tbngqwb
59898 zldbq
$ cd ffhwwg
$ ls
218749 ffhwwg.ztr
$ cd ..
$ cd jwl
$ ls
40245 cbhtl.frv
268818 fmwvvg
161866 nqp
dir nsvjcpc
dir nwdvblg
171528 qldfrhm
dir qqmb
282266 wdqqqv.pcr
$ cd nsvjcpc
$ ls
43660 wtnhh.zgw
$ cd ..
$ cd nwdvblg
$ ls
dir cltj
dir fds
$ cd cltj
$ ls
86970 dlzsw.whj
111805 qwqlzvzv
247438 zldbq
$ cd ..
$ cd fds
$ ls
49560 fsrvhv.lhd
234970 jvwfwrg.pfd
133376 qgbmc
$ cd ..
$ cd ..
$ cd qqmb
$ ls
139542 qzm.jjz
$ cd ..
$ cd ..
$ cd tbngqwb
$ ls
dir jwl
273706 vcfmt.jqv
76731 wdqqqv.pcr
$ cd jwl
$ ls
45969 ltvvm
$ cd ..
$ cd ..
$ cd ..
$ cd swmwvl
$ ls
32187 dzn.rnz
dir gsj
83763 jfgbmb.qsd
93113 vrdbrwp.dss
$ cd gsj
$ ls
dir fpzj
152202 wntpsp.tbf
$ cd fpzj
$ ls
83665 btwqdhnf.qwz
$ cd ..
$ cd ..
$ cd ..
$ cd wzpth
$ ls
dir snhss
$ cd snhss
$ ls
dir hlw
$ cd hlw
$ ls
15123 qwqlzvzv
$ cd ..
$ cd ..
$ cd ..
$ cd ..
$ cd vglf
$ ls
dir gdjmt
dir hnnw
dir htqzfcc
dir nqf
269558 qldfrhm
116732 rqg.zbf
dir tvmqzwmn
72822 vrdbrwp.dss
$ cd gdjmt
$ ls
214742 jfgbmb.qsd
$ cd ..
$ cd hnnw
$ ls
dir ffhwwg
217384 jfgbmb.qsd
153385 jvwfwrg
dir jwl
dir shdt
143935 vrdbrwp.dss
90319 zldbq
101043 zqvwfhrz.rfz
$ cd ffhwwg
$ ls
dir dsqwrdnq
261158 jvwfwrg.plf
$ cd dsqwrdnq
$ ls
129823 pngjr.rpg
$ cd ..
$ cd ..
$ cd jwl
$ ls
dir bzq
215828 hpqtdllh
dir jjmndb
dir pjzqjbd
dir pmslv
dir smfg
dir wmjjwh
$ cd bzq
$ ls
199534 jvwfwrg.tnt
$ cd ..
$ cd jjmndb
$ ls
dir cbfdqtc
dir gnjlnz
dir hlw
201443 lgdvsvc.wvp
dir lzlwstch
175514 nlvh.rjc
dir qldfrhm
144450 qwqlzvzv
dir ssh
dir tbdhtqn
150014 ttp.zqf
240619 wdqqqv.pcr
$ cd cbfdqtc
$ ls
39125 ffhwwg.fpg
264178 jpnslr.qqt
180897 wjmfvtvn
$ cd ..
$ cd gnjlnz
$ ls
217994 jwl.ddh
$ cd ..
$ cd hlw
$ ls
dir chgwjl
dir dsz
165192 ffhwwg.qfc
40771 gzph.mvb
46495 jvwfwrg
122203 lhgfb.blq
175167 qwqlzvzv
dir ttr
$ cd chgwjl
$ ls
284909 jwl.qqp
$ cd ..
$ cd dsz
$ ls
47411 bsshfjl.wbd
$ cd ..
$ cd ttr
$ ls
dir fgbgl
dir qsflswrq
5609 sfz
250311 vrdbrwp.dss
$ cd fgbgl
$ ls
203288 scclvct
$ cd ..
$ cd qsflswrq
$ ls
222611 ffhwwg
143339 thrwtw.nsg
$ cd ..
$ cd ..
$ cd ..
$ cd lzlwstch
$ ls
dir ffhwwg
dir hwmzp
dir jvwfwrg
dir ndpbn
dir qllzhd
$ cd ffhwwg
$ ls
51165 hlw.hdn
$ cd ..
$ cd hwmzp
$ ls
54571 qwqlzvzv
$ cd ..
$ cd jvwfwrg
$ ls
130055 qldfrhm
$ cd ..
$ cd ndpbn
$ ls
160215 hptz.zms
$ cd ..
$ cd qllzhd
$ ls
41306 hwnllpw.vjp
162845 vrdbrwp.dss
$ cd ..
$ cd ..
$ cd qldfrhm
$ ls
dir bwcg
dir ffhwwg
$ cd bwcg
$ ls
181254 wpzpd
$ cd ..
$ cd ffhwwg
$ ls
240618 cdmlz.wsf
dir ffhwwg
201345 jfww
128709 jwl.gwc
284209 pswsrf.wwt
dir qldfrhm
$ cd ffhwwg
$ ls
13278 wcc.qmr
165094 wdqqqv.pcr
$ cd ..
$ cd qldfrhm
$ ls
104797 ccgfmcnc.jrg
273814 hlw.pnt
182685 jvwfwrg.szl
190595 stjhgqd
dir stpvb
105499 vbqw.vwc
dir zldj
$ cd stpvb
$ ls
221672 vrdbrwp.dss
$ cd ..
$ cd zldj
$ ls
dir jwl
$ cd jwl
$ ls
130858 jhqhfrbp.nff
$ cd ..
$ cd ..
$ cd ..
$ cd ..
$ cd ..
$ cd ssh
$ ls
65814 jfgbmb.qsd
dir jvwfwrg
70744 zqhftjbs.jwd
$ cd jvwfwrg
$ ls
212356 jfgf.szv
$ cd ..
$ cd ..
$ cd tbdhtqn
$ ls
37228 ffhwwg.vvc
69069 nrtgtbmp.qlv
dir rmrwm
166294 zldbq
$ cd rmrwm
$ ls
118846 qldfrhm.hns
$ cd ..
$ cd ..
$ cd ..
$ cd pjzqjbd
$ ls
259092 cqlfdc.qdp
89322 nmpvmdlp
$ cd ..
$ cd pmslv
$ ls
82637 jwl.lhz
$ cd ..
$ cd smfg
$ ls
dir gfbpcr
dir sghtlzqv
$ cd gfbpcr
$ ls
23958 hnpgr.htf
$ cd ..
$ cd sghtlzqv
$ ls
275943 jfgbmb.qsd
149592 qwqlzvzv
285215 sgptfc.msd
179076 zldbq
$ cd ..
$ cd ..
$ cd wmjjwh
$ ls
198333 jfgbmb.qsd
59553 qwqlzvzv
91883 wdqqqv.pcr
7054 zldbq
$ cd ..
$ cd ..
$ cd shdt
$ ls
27781 hlw.vcl
255994 jpd
dir mrgppm
dir mwvgmjmb
dir nsbrbcq
263384 rbwbqf.qjc
251640 tgr.rdc
16959 zldbq
$ cd mrgppm
$ ls
dir ghzhzzp
dir jwl
dir tgpm
$ cd ghzhzzp
$ ls
dir bqplqq
dir vtqgwsj
$ cd bqplqq
$ ls
234131 lntldzhp
$ cd ..
$ cd vtqgwsj
$ ls
260109 qrzrfzr
$ cd ..
$ cd ..
$ cd jwl
$ ls
112258 ffhwwg.wvp
$ cd ..
$ cd tgpm
$ ls
dir hlw
167788 zldbq
$ cd hlw
$ ls
70960 qwqlzvzv
$ cd ..
$ cd ..
$ cd ..
$ cd mwvgmjmb
$ ls
142087 pvpw.wtv
$ cd ..
$ cd nsbrbcq
$ ls
dir hljjp
$ cd hljjp
$ ls
125853 jfgbmb.qsd
$ cd ..
$ cd ..
$ cd ..
$ cd ..
$ cd htqzfcc
$ ls
dir cqs
dir dsnpcnv
dir ffhwwg
90664 jfgbmb.qsd
92316 lsjtfbvt
dir mftm
dir mmgn
dir qqvzvw
166400 qwqlzvzv
dir vtf
dir wrbwbdt
$ cd cqs
$ ls
232548 nnv.wph
35933 rwqj.crp
$ cd ..
$ cd dsnpcnv
$ ls
115805 ffhwwg.tvt
$ cd ..
$ cd ffhwwg
$ ls
dir qldfrhm
dir wjj
$ cd qldfrhm
$ ls
221567 qwqlzvzv
dir rsztzjcm
33248 vrdbrwp.dss
114731 wdqqqv.pcr
276521 zldbq
$ cd rsztzjcm
$ ls
268313 frdpwjsh.wsh
283644 jfgbmb.qsd
dir jhdcdm
84130 jvwfwrg.vsd
31286 jwl.rth
$ cd jhdcdm
$ ls
212461 qwqlzvzv
$ cd ..
$ cd ..
$ cd ..
$ cd wjj
$ ls
89758 jvwfwrg.mmg
163105 vrdbrwp.dss
$ cd ..
$ cd ..
$ cd mftm
$ ls
278389 bbth.bht
$ cd ..
$ cd mmgn
$ ls
28122 zldbq
$ cd ..
$ cd qqvzvw
$ ls
dir mjw
dir qldfrhm
dir zbmpdwtc
$ cd mjw
$ ls
dir cvn
dir dlgzc
10631 jfgbmb.qsd
206351 qldfrhm.hgf
136824 qwqlzvzv
116870 qwzczrcf
$ cd cvn
$ ls
146142 ggtd.jlp
$ cd ..
$ cd dlgzc
$ ls
130120 wpc
$ cd ..
$ cd ..
$ cd qldfrhm
$ ls
260238 bpf.jbv
270180 cwdnf
dir czwwzj
50884 jvwfwrg.fmq
dir mjpzgbww
252028 qtdzw.bmb
dir rzqj
$ cd czwwzj
$ ls
dir cpwwqrph
19863 jfgbmb.qsd
dir snl
83915 vrdbrwp.dss
$ cd cpwwqrph
$ ls
dir jvwfwrg
$ cd jvwfwrg
$ ls
176717 jfgbmb.qsd
$ cd ..
$ cd ..
$ cd snl
$ ls
dir btngcvt
dir ffhwwg
53428 gchwbc.jtf
220232 vrdbrwp.dss
$ cd btngcvt
$ ls
172859 jwl.smp
dir tgcqmbrn
$ cd tgcqmbrn
$ ls
149905 jvwfwrg
$ cd ..
$ cd ..
$ cd ffhwwg
$ ls
145399 qldfrhm.hbg
$ cd ..
$ cd ..
$ cd ..
$ cd mjpzgbww
$ ls
52355 bwzwfjtc.rmn
5856 ffhwwg.tnh
146211 scbdnlgl
$ cd ..
$ cd rzqj
$ ls
dir jmjszd
134481 vgr
187382 vrdbrwp.dss
$ cd jmjszd
$ ls
81971 qldfrhm
$ cd ..
$ cd ..
$ cd ..
$ cd zbmpdwtc
$ ls
193744 jvntrn
231403 qwqlzvzv
$ cd ..
$ cd ..
$ cd vtf
$ ls
2562 vzngcbq
$ cd ..
$ cd wrbwbdt
$ ls
dir brzwbmc
29261 hlw
$ cd brzwbmc
$ ls
dir ggh
174287 jfgbmb.qsd
dir jwl
247329 mpdz
dir thm
83546 vrdbrwp.dss
231269 wmwhhhmn.rms
$ cd ggh
$ ls
dir cqrmsltg
18724 mrlwwdv.ffb
$ cd cqrmsltg
$ ls
dir ffhwwg
dir jvwfwrg
41263 pmrmh.zmn
dir tcjr
$ cd ffhwwg
$ ls
dir hlw
$ cd hlw
$ ls
139875 ljnfchr.frr
$ cd ..
$ cd ..
$ cd jvwfwrg
$ ls
141078 zldbq
$ cd ..
$ cd tcjr
$ ls
dir hnngpdc
153685 jwl
93502 nwlsf.dbq
226658 qwqlzvzv
$ cd hnngpdc
$ ls
243203 gchtc.sst
$ cd ..
$ cd ..
$ cd ..
$ cd ..
$ cd jwl
$ ls
62087 hfp.cfv
$ cd ..
$ cd thm
$ ls
228008 dfqgcd.frc
167850 glblcw
dir jvwfwrg
$ cd jvwfwrg
$ ls
dir ffhwwg
dir jgvf
170488 qmc.vgf
$ cd ffhwwg
$ ls
258985 jfgbmb.qsd
$ cd ..
$ cd jgvf
$ ls
150671 rdplqftl
$ cd ..
$ cd ..
$ cd ..
$ cd ..
$ cd ..
$ cd ..
$ cd nqf
$ ls
dir rglrpqd
$ cd rglrpqd
$ ls
276785 nnbs.dhr
224128 qwqlzvzv
$ cd ..
$ cd ..
$ cd tvmqzwmn
$ ls
47655 jfgbmb.qsd
233646 qwqlzvzv
237245 rqfp
185131 whntfvm.sfz

115
day7/main.py Normal file
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from dataclasses import dataclass, field
from typing import Self
from common.file import read_data
DIRECTORY = "directory"
FILE = "file"
test_data = [
"$ cd /",
"$ ls",
"dir a",
"14848514 b.txt",
"8504156 c.dat",
"dir d",
"$ cd a",
"$ ls",
"dir e",
"29116 f",
"2557 g",
"62596 h.lst",
"$ cd e",
"$ ls",
"584 i",
"$ cd ..",
"$ cd ..",
"$ cd d",
"$ ls",
"4060174 j",
"8033020 d.log",
"5626152 d.ext",
"7214296 k",
]
@dataclass
class Node:
node_type: str
name: str
_size: int = 0
children: list[Self] = field(default_factory=list)
parent: Self | None = None
def add(self, leaf: Self):
leaf.parent = self
self.children.append(leaf)
@property
def size(self) -> int:
if self.node_type == DIRECTORY:
self.size = sum(child.size for child in self.children)
return self._size
@size.setter
def size(self, value: int):
self._size = value
def new_leaf(command: str) -> Node:
a, b = command.split(" ")
if a == "dir":
node_type = DIRECTORY
name = b
size = 0
else:
node_type = FILE
name = b
size = int(a)
node = Node(node_type=node_type, name=name)
node.size = size
return node
def move_to(tree: Node, directory: str) -> Node:
if directory == "..":
return tree.parent
return [node for node in tree.children if node.name == directory][0]
def build_tree(data: list[str]) -> int:
root = Node(node_type=DIRECTORY, name="/")
current = root
directories = []
i = 1
while i < len(data[1:]):
if "$ cd" in data[i]:
_, _, directory = data[i].split(" ")
current = move_to(current, directory)
i += 1
if "$ ls" in data[i]:
i += 1
while i <= len(data[1:]) and data[i][0] != "$":
leaf = new_leaf(data[i])
if leaf.node_type == DIRECTORY:
directories.append(leaf)
current.add(leaf)
i += 1
return sum(directory.size for directory in directories if directory.size < 100_000)
def total_files_size(data: list[str]) -> int:
return build_tree(data)
if __name__ == "__main__":
dataset = read_data()
res = total_files_size(test_data)
assert res == 95437, f"{res} is not the right value, want 95437"
print(total_files_size(dataset))