From e1d55dda2ecc43aa81b1dfe07470d1568820f1fa Mon Sep 17 00:00:00 2001
From: Mia Herkt <mia@0x0.st>
Date: Wed, 7 Dec 2022 19:03:14 +0100
Subject: [PATCH] 07: Solve in C

---
 07/input      | 1082 +++++++++++++++++++++++++++++++++++++++++++++++++
 07/solution.c |   88 ++++
 2 files changed, 1170 insertions(+)
 create mode 100644 07/input
 create mode 100644 07/solution.c

diff --git a/07/input b/07/input
new file mode 100644
index 0000000..ca23499
--- /dev/null
+++ b/07/input
@@ -0,0 +1,1082 @@
+$ cd /
+$ ls
+dir brhvclj
+dir clnvqg
+dir dtqtvvrn
+dir lcz
+dir pcqjncwl
+dir qwvfpgl
+dir rtmj
+dir shg
+dir tcdmgwp
+$ cd brhvclj
+$ ls
+40016 mtlscfrd.gdr
+dir mvslzl
+112449 npp.vjv
+46674 pbgjwb
+dir qdtls
+dir tfns
+$ cd mvslzl
+$ ls
+dir dngldfww
+dir dzplphqw
+$ cd dngldfww
+$ ls
+102218 wcrvztrh.mzb
+$ cd ..
+$ cd dzplphqw
+$ ls
+93724 brhvclj
+169467 cwqwcjc.lgd
+$ cd ..
+$ cd ..
+$ cd qdtls
+$ ls
+dir nnlzrwgh
+dir svc
+168425 tcq.lng
+99608 vjrntvbz.sgn
+dir wshf
+dir wtmdzgvg
+$ cd nnlzrwgh
+$ ls
+141976 fnb
+$ cd ..
+$ cd svc
+$ ls
+87249 hzrml
+46855 qbmgmmc
+147235 zsbsq.cvq
+$ cd ..
+$ cd wshf
+$ ls
+25072 npp.vjv
+$ cd ..
+$ cd wtmdzgvg
+$ ls
+165660 cfpfdqq.vfd
+dir dhbrmn
+176203 dscvmj.wpn
+dir rcdwft
+$ cd dhbrmn
+$ ls
+200474 brhvclj.hcf
+233675 npp.vjv
+218734 ttntt
+$ cd ..
+$ cd rcdwft
+$ ls
+dir wvfdjv
+$ cd wvfdjv
+$ ls
+104669 mdrr
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd tfns
+$ ls
+dir clnvqg
+15637 mlft.cvp
+dir pqp
+77675 svc.mqv
+dir ttntt
+dir wfcczs
+dir wshwhzw
+$ cd clnvqg
+$ ls
+dir brhvclj
+103188 cdfj
+256254 svc
+72302 tndnh.vgg
+$ cd brhvclj
+$ ls
+dir brhvclj
+$ cd brhvclj
+$ ls
+246966 mlrcgl
+93485 ttntt.ztq
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd pqp
+$ ls
+dir svc
+206837 ttntt.qpm
+$ cd svc
+$ ls
+202934 bsczwq
+$ cd ..
+$ cd ..
+$ cd ttntt
+$ ls
+dir dfmgqmvm
+126511 hpdm.ctv
+$ cd dfmgqmvm
+$ ls
+dir qbms
+201736 wczpvsw.ddr
+dir wshwhzw
+$ cd qbms
+$ ls
+20046 lvfphhpw.sjv
+186516 pdbtbmf
+149493 svc.dqh
+dir tdvtcmwz
+$ cd tdvtcmwz
+$ ls
+100584 hpdm.ctv
+$ cd ..
+$ cd ..
+$ cd wshwhzw
+$ ls
+116856 hwvgnwf
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd wfcczs
+$ ls
+dir rlbnv
+$ cd rlbnv
+$ ls
+55214 ttntt.mnl
+$ cd ..
+$ cd ..
+$ cd wshwhzw
+$ ls
+34867 clnvqg
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd clnvqg
+$ ls
+dir bchstbpm
+dir bgbdbr
+dir clnvqg
+25956 clnvqg.rbr
+60939 gzzpwvzn.zzr
+212583 jjfrh.ttr
+dir jlsvjcdm
+dir mzmqr
+dir rtmg
+dir tqnmwdl
+$ cd bchstbpm
+$ ls
+dir sgbwd
+dir ttntt
+$ cd sgbwd
+$ ls
+267083 clnvqg
+$ cd ..
+$ cd ttntt
+$ ls
+243283 rwcmtrr.nvf
+$ cd ..
+$ cd ..
+$ cd bgbdbr
+$ ls
+dir jshpz
+$ cd jshpz
+$ ls
+dir dpnqrg
+dir gsvwsc
+173172 jjfrh.ttr
+203836 jzm.fcn
+83990 pdbtbmf
+276348 pqcmhzhv.ltv
+dir ttntt
+dir wshwhzw
+$ cd dpnqrg
+$ ls
+140379 dvmnw.gmd
+$ cd ..
+$ cd gsvwsc
+$ ls
+84951 pdbtbmf
+$ cd ..
+$ cd ttntt
+$ ls
+149785 brhvclj
+dir rfcssr
+$ cd rfcssr
+$ ls
+13174 lgwztd.fcm
+$ cd ..
+$ cd ..
+$ cd wshwhzw
+$ ls
+55302 clnvqg.nqz
+dir cpbh
+dir mrv
+139006 wshwhzw.chb
+dir zgtnfm
+$ cd cpbh
+$ ls
+13930 wvnzlj
+$ cd ..
+$ cd mrv
+$ ls
+207468 cqhpvpzf.zjn
+dir drgcn
+211947 pdbtbmf
+dir svc
+$ cd drgcn
+$ ls
+dir brhvclj
+247117 gnrdmjls.tps
+$ cd brhvclj
+$ ls
+162309 hpdm.ctv
+231880 jjfrh.ttr
+$ cd ..
+$ cd ..
+$ cd svc
+$ ls
+270511 cjsh
+dir ttntt
+$ cd ttntt
+$ ls
+43248 ssrrt.dqr
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd zgtnfm
+$ ls
+dir vhjtgv
+$ cd vhjtgv
+$ ls
+98550 svc
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd clnvqg
+$ ls
+dir gcnc
+141966 nrlptqrq.jtv
+$ cd gcnc
+$ ls
+268141 bqzr
+dir brhvclj
+dir cjcpzv
+262869 npp.vjv
+$ cd brhvclj
+$ ls
+dir qqr
+dir qwwl
+265677 rcnn
+$ cd qqr
+$ ls
+143274 stpjr
+$ cd ..
+$ cd qwwl
+$ ls
+dir clnvqg
+213885 mfctzj
+27640 tvp.fqv
+$ cd clnvqg
+$ ls
+dir brhvclj
+dir zzhwq
+$ cd brhvclj
+$ ls
+67021 ttntt.fjp
+$ cd ..
+$ cd zzhwq
+$ ls
+dir gsplfsvm
+$ cd gsplfsvm
+$ ls
+103196 qgjmbn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd cjcpzv
+$ ls
+173344 bjpb.tln
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd jlsvjcdm
+$ ls
+dir bmgbjnbr
+dir brhvclj
+106074 brhvclj.cwn
+96364 gwgzvwf
+199266 hpdm.ctv
+dir svc
+168747 tsb.grv
+170407 ttntt
+$ cd bmgbjnbr
+$ ls
+dir bddbffsf
+dir brhvclj
+143376 clnvqg
+dir ddbcvhqr
+199097 flq.rls
+156627 hbjcftfb.vvj
+41970 jjfrh.ttr
+dir rlj
+dir svc
+dir wshwhzw
+dir zhczqq
+$ cd bddbffsf
+$ ls
+181609 svc.vdv
+$ cd ..
+$ cd brhvclj
+$ ls
+dir brhvclj
+64387 cdfj
+168933 fhq.lzh
+193119 njrrzm
+129346 svc.tqs
+$ cd brhvclj
+$ ls
+dir bpgmc
+dir brhvclj
+dir nrrpsn
+dir ttntt
+$ cd bpgmc
+$ ls
+42515 npp.vjv
+dir wshwhzw
+$ cd wshwhzw
+$ ls
+80221 pdbtbmf
+$ cd ..
+$ cd ..
+$ cd brhvclj
+$ ls
+74083 qfwj
+$ cd ..
+$ cd nrrpsn
+$ ls
+58623 cdfj
+$ cd ..
+$ cd ttntt
+$ ls
+117488 ddd.sbj
+69152 npp.vjv
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ddbcvhqr
+$ ls
+3037 brhvclj.ngg
+dir flz
+85361 hhjw.czf
+193196 npp.vjv
+dir svc
+173507 tmfc
+274216 ttntt.ddw
+$ cd flz
+$ ls
+249582 pdbtbmf
+$ cd ..
+$ cd svc
+$ ls
+dir ddrthl
+dir dptjfd
+dir hqncdcdh
+$ cd ddrthl
+$ ls
+148058 clnvqg
+185720 svc.wch
+$ cd ..
+$ cd dptjfd
+$ ls
+101663 cdfj
+80244 clnvqg.qzn
+98435 jrsmdsjv.dft
+dir nhjthr
+$ cd nhjthr
+$ ls
+105069 fnvztg.pwp
+dir pmgzdp
+dir qgvzbclg
+$ cd pmgzdp
+$ ls
+94671 pdbtbmf
+$ cd ..
+$ cd qgvzbclg
+$ ls
+183904 pdbtbmf
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd hqncdcdh
+$ ls
+105956 cwdsppc.hnn
+91439 pdbtbmf
+21314 wshwhzw.dcn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rlj
+$ ls
+173111 clnvqg
+dir gsfzgvpz
+dir ljwrdb
+102231 pdbtbmf
+$ cd gsfzgvpz
+$ ls
+266749 bcdrtwzd.nrz
+$ cd ..
+$ cd ljwrdb
+$ ls
+dir dlmhm
+dir mpmtj
+$ cd dlmhm
+$ ls
+50087 ttntt.rdv
+$ cd ..
+$ cd mpmtj
+$ ls
+254330 czh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd svc
+$ ls
+131211 pdbtbmf
+214730 tgpprcnb.dfv
+$ cd ..
+$ cd wshwhzw
+$ ls
+225058 cppwqrg
+dir hrzsfhct
+228371 tzvn.hhj
+dir vjjgrt
+$ cd hrzsfhct
+$ ls
+dir pqvlqpdt
+139531 pvlhtz.grj
+$ cd pqvlqpdt
+$ ls
+211827 hwnlsv.hhq
+$ cd ..
+$ cd ..
+$ cd vjjgrt
+$ ls
+dir hdlcnfm
+266998 npp.vjv
+259189 qndrvvqv
+$ cd hdlcnfm
+$ ls
+dir snhftjr
+$ cd snhftjr
+$ ls
+198904 svc.wwb
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd zhczqq
+$ ls
+dir brhvclj
+$ cd brhvclj
+$ ls
+123699 ttntt.cds
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd brhvclj
+$ ls
+dir dvqszvl
+dir ttr
+$ cd dvqszvl
+$ ls
+172068 jjfrh.ttr
+$ cd ..
+$ cd ttr
+$ ls
+dir rzsqqhn
+$ cd rzsqqhn
+$ ls
+129077 cbpg
+dir clnvqg
+12120 jjfrh.ttr
+211464 npp.vjv
+12541 qgl.tvn
+136465 snbrwg.cpg
+$ cd clnvqg
+$ ls
+263592 cdfj
+249813 pdbtbmf
+190382 vpzfll.wqw
+dir wshwhzw
+$ cd wshwhzw
+$ ls
+57060 cdfj
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd svc
+$ ls
+dir clnqz
+dir ggrwpjjg
+dir mjvm
+217220 ngntgnrw.brd
+dir svc
+146817 wshwhzw
+dir zmchn
+$ cd clnqz
+$ ls
+108229 clnvqg
+195990 svc
+29403 swf
+$ cd ..
+$ cd ggrwpjjg
+$ ls
+dir gdftglf
+142336 hpdm.ctv
+190941 npp.vjv
+$ cd gdftglf
+$ ls
+209357 csfsthp.cnc
+30622 rjs
+dir ttntt
+15836 wvqc.zsz
+$ cd ttntt
+$ ls
+224617 rvsvs.dfh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mjvm
+$ ls
+dir ctlddnj
+dir ddwg
+207564 ncls.nwh
+139671 npp.vjv
+212692 wbqnvn.qhq
+$ cd ctlddnj
+$ ls
+254493 dzr.dfv
+123026 fmbzjww
+79075 svc
+43782 svc.vnw
+dir vgqf
+258169 vtljbndt.tvc
+$ cd vgqf
+$ ls
+277076 dhqhfb
+dir ffqg
+dir svc
+$ cd ffqg
+$ ls
+dir nrd
+$ cd nrd
+$ ls
+205734 vrwph.bgp
+$ cd ..
+$ cd ..
+$ cd svc
+$ ls
+dir brhvclj
+111819 hpdm.ctv
+68407 nglt
+168768 ttntt
+$ cd brhvclj
+$ ls
+75177 hvppncbd.sgs
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ddwg
+$ ls
+21210 phwqwshr
+207062 rftdb.mcq
+dir tthrf
+$ cd tthrf
+$ ls
+dir czjnvnn
+236764 dhhw.mbs
+25583 ljdwgwhm.fbm
+dir lrgtg
+113563 srsh.fpb
+dir vzhpqb
+110004 zgcvsc.pmm
+$ cd czjnvnn
+$ ls
+143802 cbqmvtw.zjv
+37329 svc.rwf
+$ cd ..
+$ cd lrgtg
+$ ls
+dir gpwpc
+$ cd gpwpc
+$ ls
+257389 jjfrh.ttr
+$ cd ..
+$ cd ..
+$ cd vzhpqb
+$ ls
+95696 clnvqg
+218063 clnvqg.qtd
+dir hnqqrdf
+dir ttntt
+$ cd hnqqrdf
+$ ls
+dir brhvclj
+$ cd brhvclj
+$ ls
+dir ttntt
+$ cd ttntt
+$ ls
+40453 npp.vjv
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ttntt
+$ ls
+30351 clnvqg.fwm
+60519 pdbtbmf
+dir pfhrgj
+247371 qcvs.rbj
+155276 qdjqgqqw
+$ cd pfhrgj
+$ ls
+41975 svc.fwm
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd svc
+$ ls
+110021 jftcvbl.lhh
+$ cd ..
+$ cd zmchn
+$ ls
+188817 brhvclj.zcq
+dir ddzjr
+dir fnmhc
+dir tbhwr
+dir vbtmfp
+dir zrzrjm
+$ cd ddzjr
+$ ls
+217591 clnvqg.css
+dir ttntt
+dir wshwhzw
+$ cd ttntt
+$ ls
+dir bscqn
+132748 svc.pbh
+$ cd bscqn
+$ ls
+25049 tlcwbbng.spf
+$ cd ..
+$ cd ..
+$ cd wshwhzw
+$ ls
+164106 brhvclj
+193910 chnrbb
+dir njsnwmrc
+dir nnhcsb
+195858 qrrt.pmp
+43854 ttntt
+90698 vdvfdgcl.mpr
+$ cd njsnwmrc
+$ ls
+273188 hpdm.ctv
+261368 wzpzjgw
+$ cd ..
+$ cd nnhcsb
+$ ls
+dir dmnmcgr
+67701 pdbtbmf
+145277 ptlqcl.sgt
+dir pwrjt
+13031 svc.jbb
+263232 svc.mvh
+91724 vggpwj
+$ cd dmnmcgr
+$ ls
+43175 szbcvp
+109544 vjqjzp
+$ cd ..
+$ cd pwrjt
+$ ls
+dir ffqfqvjv
+dir svc
+$ cd ffqfqvjv
+$ ls
+102537 bgmgwt.gmg
+$ cd ..
+$ cd svc
+$ ls
+177913 jswrfjvp.vgc
+145714 npp.vjv
+272487 zzsl
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd fnmhc
+$ ls
+dir dhhwdbb
+dir ttntt
+dir wshwhzw
+$ cd dhhwdbb
+$ ls
+201253 zpvv
+$ cd ..
+$ cd ttntt
+$ ls
+dir brhvclj
+40561 chb.fbh
+159663 gzwrtwtd
+119970 wwz.rft
+$ cd brhvclj
+$ ls
+19488 gwtvbzph
+98427 hpdm.ctv
+8547 swncltj.sbn
+54698 wshwhzw.fmj
+dir ztlvdwq
+$ cd ztlvdwq
+$ ls
+259702 cdfj
+230030 mbz.ttq
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd wshwhzw
+$ ls
+dir clnvqg
+dir gwcsprqv
+259902 hmrb.njt
+125791 pdbtbmf
+dir spffhcnz
+268942 srwjphc.lbp
+dir wshwhzw
+$ cd clnvqg
+$ ls
+208408 hdwf.ppm
+163498 npp.vjv
+$ cd ..
+$ cd gwcsprqv
+$ ls
+135381 hpdm.ctv
+150197 jjfrh.ttr
+61236 lwjhqc
+150026 tgwjwdwj
+dir wshwhzw
+$ cd wshwhzw
+$ ls
+51089 wshwhzw.qtb
+$ cd ..
+$ cd ..
+$ cd spffhcnz
+$ ls
+79855 bmrcdm
+dir clnvqg
+180748 jjfrh.ttr
+122314 pdbtbmf
+85765 tbpsjv.tfw
+$ cd clnvqg
+$ ls
+dir nvjj
+dir tqr
+$ cd nvjj
+$ ls
+dir gqhqmlhm
+dir mbfftpbj
+$ cd gqhqmlhm
+$ ls
+211887 brhvclj
+$ cd ..
+$ cd mbfftpbj
+$ ls
+60539 clnvqg.gqw
+$ cd ..
+$ cd ..
+$ cd tqr
+$ ls
+dir fvdch
+$ cd fvdch
+$ ls
+124864 svc
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd wshwhzw
+$ ls
+dir jrzmrg
+103956 npp.vjv
+126932 zvwpmnqh.zmh
+$ cd jrzmrg
+$ ls
+dir svc
+$ cd svc
+$ ls
+143992 jhcvmjp.flt
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd tbhwr
+$ ls
+42758 jjfrh.ttr
+$ cd ..
+$ cd vbtmfp
+$ ls
+171021 npp.vjv
+$ cd ..
+$ cd zrzrjm
+$ ls
+dir brhvclj
+201331 cgtqdtqq.gsc
+206771 clnvqg.zpr
+55754 jgprc
+dir jrww
+dir sqtzndzg
+$ cd brhvclj
+$ ls
+190144 brhvclj
+198432 rvbqglv.gzg
+$ cd ..
+$ cd jrww
+$ ls
+110574 clnvqg
+$ cd ..
+$ cd sqtzndzg
+$ ls
+189854 clnvqg.qbc
+260937 ldm
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mzmqr
+$ ls
+117135 dfws
+98546 jjfrh.ttr
+dir jptq
+dir sctfsvs
+dir svc
+dir swsjjr
+dir tstct
+86793 vhfcwbv.wfq
+$ cd jptq
+$ ls
+dir brhvclj
+52040 cnmb
+dir fvqh
+240539 rrdsr
+dir tczvhsgn
+dir zbbq
+$ cd brhvclj
+$ ls
+254250 vtgsqs
+$ cd ..
+$ cd fvqh
+$ ls
+18471 hpdm.ctv
+$ cd ..
+$ cd tczvhsgn
+$ ls
+241619 wshwhzw.cmh
+$ cd ..
+$ cd zbbq
+$ ls
+82844 vtjbg.svl
+$ cd ..
+$ cd ..
+$ cd sctfsvs
+$ ls
+dir nbjljt
+dir rszwnh
+56137 stcmw.wwr
+$ cd nbjljt
+$ ls
+214471 fst.pwm
+$ cd ..
+$ cd rszwnh
+$ ls
+dir brhvclj
+dir ldrsbj
+280840 pzs
+274286 vpsnwfvc.bqg
+$ cd brhvclj
+$ ls
+60019 fwbgt.rmb
+$ cd ..
+$ cd ldrsbj
+$ ls
+23175 jjfrh.ttr
+120171 lpb
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd svc
+$ ls
+dir rpgm
+$ cd rpgm
+$ ls
+205836 ttntt
+$ cd ..
+$ cd ..
+$ cd swsjjr
+$ ls
+100874 cdfj
+229131 dcdm.jcz
+18144 mspnwqmw.bpc
+$ cd ..
+$ cd tstct
+$ ls
+94293 clnvqg
+110519 hpdm.ctv
+$ cd ..
+$ cd ..
+$ cd rtmg
+$ ls
+dir clnvqg
+260745 gvmlqpbs.mqm
+dir ldcwjlm
+192472 ttntt.gnf
+$ cd clnvqg
+$ ls
+121970 zsmwvt.sbw
+$ cd ..
+$ cd ldcwjlm
+$ ls
+254060 hpdm.ctv
+225558 svc.cmz
+229614 wshwhzw.dzn
+$ cd ..
+$ cd ..
+$ cd tqnmwdl
+$ ls
+50489 cdfj
+dir gltsgnf
+265020 hqnjnt.gtc
+dir psltbtl
+$ cd gltsgnf
+$ ls
+dir ttntt
+dir wgwvd
+$ cd ttntt
+$ ls
+120262 zvjh.mzl
+$ cd ..
+$ cd wgwvd
+$ ls
+172875 flt.jbn
+173182 pdbtbmf
+$ cd ..
+$ cd ..
+$ cd psltbtl
+$ ls
+dir sgqvlr
+88647 svc.jnw
+208354 svc.jzb
+98962 zsld.hjs
+$ cd sgqvlr
+$ ls
+151451 brhvclj.thj
+213287 pdbtbmf
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd dtqtvvrn
+$ ls
+253546 ttntt.dtl
+257990 wshwhzw.rqp
+$ cd ..
+$ cd lcz
+$ ls
+dir csqfmjz
+dir nfgnnt
+dir rwzmjgqz
+dir wshwhzw
+dir wtvtszw
+$ cd csqfmjz
+$ ls
+124616 wwbvnjg
+$ cd ..
+$ cd nfgnnt
+$ ls
+dir dvslq
+dir fbzss
+dir ttntt
+$ cd dvslq
+$ ls
+132520 cdfj
+dir nsq
+1447 svc.spv
+$ cd nsq
+$ ls
+265807 hpdm.ctv
+95487 wpqhvf.dqg
+$ cd ..
+$ cd ..
+$ cd fbzss
+$ ls
+153744 rccwtz.tfs
+$ cd ..
+$ cd ttntt
+$ ls
+109641 wshwhzw
+$ cd ..
+$ cd ..
+$ cd rwzmjgqz
+$ ls
+12039 tpggbsd
+$ cd ..
+$ cd wshwhzw
+$ ls
+57458 qqnznsvj
+$ cd ..
+$ cd wtvtszw
+$ ls
+dir dlr
+151194 dzwmwjz
+dir nzq
+$ cd dlr
+$ ls
+142748 nchwzm
+$ cd ..
+$ cd nzq
+$ ls
+242998 wqzpw.hvh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd pcqjncwl
+$ ls
+10646 wpst.sds
+$ cd ..
+$ cd qwvfpgl
+$ ls
+65156 bfmt.zcb
+157745 hpdm.ctv
+104612 rtbbgjr.wpv
+$ cd ..
+$ cd rtmj
+$ ls
+79449 wngz
+$ cd ..
+$ cd shg
+$ ls
+27187 srtj.qwz
+$ cd ..
+$ cd tcdmgwp
+$ ls
+277338 wshwhzw
diff --git a/07/solution.c b/07/solution.c
new file mode 100644
index 0000000..3a11d22
--- /dev/null
+++ b/07/solution.c
@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct entry {
+    char *name;
+    int isdir;
+    size_t size;
+    struct entry **entries;
+    size_t n_entries;
+    struct entry *parent;
+} entry;
+
+entry *findent(entry *e, int isdir, const char *name) {
+    for (size_t i = 0; i < e->n_entries; i++) {
+        if (e->entries[i]->isdir == isdir)
+            if (!strcmp(e->entries[i]->name, name))
+                return e->entries[i];
+    }
+
+    return NULL;
+}
+
+entry *addent(entry *parent, int isdir, const char *name) {
+    if (parent->n_entries)
+        parent->entries = realloc(parent->entries, ++(parent->n_entries) * sizeof(entry*));
+    else
+        parent->entries = malloc(++(parent->n_entries) * sizeof(entry*));
+
+    entry *e = parent->entries[parent->n_entries - 1] = calloc(1, sizeof(entry));
+    e->isdir = isdir;
+    e->name = malloc(strlen(name) + 1);
+    strcpy(e->name, name);
+    e->parent = parent;
+
+    return e;
+}
+
+int main(void) {
+    char l[64];
+    entry *root = calloc(1, sizeof(entry));
+    root->isdir++;
+    entry *current;
+    size_t S = 0, G = 0, required = 0;
+
+    while (fgets(l, 64, stdin)) {
+        l[strlen(l) - 1] = '\0';
+        if (l[0] == '$') {
+            if (l[2] == 'c')
+                if (l[5] == '/')
+                    current = root;
+                else if (l[5] == '.')
+                    current = current->parent;
+                else
+                    current = findent(current, 1, l + 5);
+        } else if (l[0] == 'd') {
+            if (!findent(current, 1, l + 4))
+                addent(current, 1, l + 4);
+        } else {
+            char *p;
+            size_t sz = strtoul(l, &p, 10);
+            entry *f = addent(current, 0, p + 1);
+            f->size = sz;
+            for (f = current; f->parent; f = f->parent)
+                f->size += sz;
+            f->size += sz;
+        }
+    }
+
+    current = root;
+    required = 30000000UL - (70000000UL - root->size);
+    do {
+        if (current->n_entries) {
+            current->n_entries--;
+            current = (current->entries++)[0];
+        } else {
+            if (current->isdir)
+                if (current->size < 100000)
+                    S += current->size;
+                else if (current->size >= required && (current->size < G || !G))
+                    G = current->size;
+
+            current = current->parent;
+        }
+    } while (current);
+
+    printf("Silver: %lu\nGold: %lu\n", S, G);
+}