diff --git a/day7/.gitignore b/day7/.gitignore
new file mode 100644
index 0000000..409c9e1
--- /dev/null
+++ b/day7/.gitignore
@@ -0,0 +1,86 @@
+node_modules/
+.node_modules/
+built/*
+tests/cases/rwc/*
+tests/cases/test262/*
+tests/cases/perf/*
+!tests/cases/webharness/compilerToString.js
+test-args.txt
+~*.docx
+\#*\#
+.\#*
+tests/baselines/local/*
+tests/baselines/local.old/*
+tests/services/baselines/local/*
+tests/baselines/prototyping/local/*
+tests/baselines/rwc/*
+tests/baselines/test262/*
+tests/baselines/reference/projectOutput/*
+tests/baselines/local/projectOutput/*
+tests/baselines/reference/testresults.tap
+tests/services/baselines/prototyping/local/*
+tests/services/browser/typescriptServices.js
+src/harness/*.js
+src/compiler/diagnosticInformationMap.generated.ts
+src/compiler/diagnosticMessages.generated.json
+src/parser/diagnosticInformationMap.generated.ts
+src/parser/diagnosticMessages.generated.json
+rwc-report.html
+*.swp
+build.json
+*.actual
+tests/webTestServer.js
+tests/webTestServer.js.map
+tests/webhost/*.d.ts
+tests/webhost/webtsc.js
+tests/cases/**/*.js
+!tests/cases/docker/*.js/
+tests/cases/**/*.js.map
+*.config
+scripts/eslint/built/
+scripts/debug.bat
+scripts/run.bat
+scripts/**/*.js
+scripts/**/*.js.map
+coverage/
+internal/
+**/.DS_Store
+.settings
+**/.vs
+**/.vscode/*
+!**/.vscode/tasks.json
+!**/.vscode/settings.template.json
+!**/.vscode/launch.template.json
+!**/.vscode/extensions.json
+!tests/cases/projects/projectOption/**/node_modules
+!tests/cases/projects/NodeModulesSearch/**/*
+!tests/baselines/reference/project/nodeModules*/**/*
+.idea
+yarn.lock
+yarn-error.log
+.parallelperf.*
+tests/cases/user/*/package-lock.json
+tests/cases/user/*/node_modules/
+tests/cases/user/*/**/*.js
+tests/cases/user/*/**/*.js.map
+tests/cases/user/*/**/*.d.ts
+!tests/cases/user/zone.js/
+!tests/cases/user/bignumber.js/
+!tests/cases/user/discord.js/
+tests/baselines/reference/dt
+.failed-tests
+TEST-results.xml
+package-lock.json
+tests/cases/user/npm/npm
+tests/cases/user/TypeScript-React-Starter/TypeScript-React-Starter
+tests/cases/user/TypeScript-Node-Starter/TypeScript-Node-Starter
+tests/cases/user/TypeScript-React-Native-Starter/TypeScript-React-Native-Starter
+tests/cases/user/TypeScript-Vue-Starter/TypeScript-Vue-Starter
+tests/cases/user/TypeScript-WeChat-Starter/TypeScript-WeChat-Starter
+tests/cases/user/create-react-app/create-react-app
+tests/cases/user/fp-ts/fp-ts
+tests/cases/user/webpack/webpack
+tests/cases/user/puppeteer/puppeteer
+tests/cases/user/axios-src/axios-src
+tests/cases/user/prettier/prettier
+.eslintcache
diff --git a/day7/input b/day7/input
new file mode 100644
index 0000000..a8f9e39
--- /dev/null
+++ b/day7/input
@@ -0,0 +1,1089 @@
+$ cd /
+$ ls
+246027 gldg.jrd
+dir qffvbf
+dir qjjgh
+dir vpjqpqfm
+$ cd qffvbf
+$ ls
+dir dcqf
+dir grcj
+dir hwllqcd
+76103 jrhp.hgg
+253696 nscv.wvb
+dir stnrzs
+dir vzgpfd
+$ cd dcqf
+$ ls
+dir gcjmpnsl
+$ cd gcjmpnsl
+$ ls
+198360 gldg.jrd
+$ cd ..
+$ cd ..
+$ cd grcj
+$ ls
+56512 grgtnhn.zdn
+$ cd ..
+$ cd hwllqcd
+$ ls
+100505 frzf.mzc
+209030 gldg.jrd
+9330 jjtjjlsr.dnl
+191034 mfmps.vjt
+82405 nscv.wvb
+$ cd ..
+$ cd stnrzs
+$ ls
+dir gmtmfpmb
+dir jrhp
+dir rhf
+dir wzjtd
+$ cd gmtmfpmb
+$ ls
+279472 hswhjhmj
+81339 rsgsrn
+$ cd ..
+$ cd jrhp
+$ ls
+dir fpmnp
+99771 grcj.scb
+dir hjglg
+dir hwvzv
+$ cd fpmnp
+$ ls
+33215 grcj.tcj
+$ cd ..
+$ cd hjglg
+$ ls
+206893 tctfwpf.jhv
+$ cd ..
+$ cd hwvzv
+$ ls
+dir mfmps
+$ cd mfmps
+$ ls
+46252 rjrmbqwr.wbj
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rhf
+$ ls
+222859 dcgvw
+41140 grcj.qzh
+dir zcjh
+217515 zgqjbf
+$ cd zcjh
+$ ls
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+$ cd ..
+$ cd ..
+$ cd wzjtd
+$ ls
+dir bnjj
+dir dhhpf
+dir grcj
+dir jqmnp
+16602 mfmps.dht
+dir mrgh
+112236 rsgsrn
+dir wqwwwfd
+243851 zgqjbf.bjh
+$ cd bnjj
+$ ls
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+$ cd ..
+$ cd dhhpf
+$ ls
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+18523 wcfpqqp.tcf
+$ cd ..
+$ cd grcj
+$ ls
+dir bcbspw
+dir mpq
+dir pjzw
+$ cd bcbspw
+$ ls
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+$ cd ..
+$ cd mpq
+$ ls
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+$ cd ..
+$ cd pjzw
+$ ls
+dir cpffwn
+$ cd cpffwn
+$ ls
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+$ cd ..
+$ cd ..
+$ cd ..
+$ cd jqmnp
+$ ls
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+103834 rsgsrn
+34528 wcfpqqp.tcf
+$ cd ..
+$ cd mrgh
+$ ls
+dir grcj
+$ cd grcj
+$ ls
+211470 bbzm.sbq
+$ cd ..
+$ cd ..
+$ cd wqwwwfd
+$ ls
+59532 blfr.lqh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd vzgpfd
+$ ls
+dir grcj
+dir lvhfqr
+dir zgvjpnf
+$ cd grcj
+$ ls
+160936 jbfsbsnn.sgj
+dir mfmps
+dir mfqjssr
+dir vzgpfd
+dir zgqjbf
+$ cd mfmps
+$ ls
+176441 dcgvw
+9961 grcj.sdl
+dir mfmps
+181303 nscv.wvb
+273550 zfjhqtp
+$ cd mfmps
+$ ls
+dir ndqjhlhp
+$ cd ndqjhlhp
+$ ls
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+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mfqjssr
+$ ls
+137211 gldg.jrd
+254301 grcj.rgv
+$ cd ..
+$ cd vzgpfd
+$ ls
+dir hqnfwtj
+dir mtqzh
+215717 thd.cgt
+dir vgtvctd
+dir vzgpfd
+64282 zgqjbf
+$ cd hqnfwtj
+$ ls
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+128579 cnsm.mdt
+150972 fpmjd
+54851 rsgsrn
+$ cd ..
+$ cd mtqzh
+$ ls
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+209838 gldg.jrd
+87464 jgdhm.wrb
+dir nbnzfc
+$ cd nbnzfc
+$ ls
+dir rtrbhtb
+267378 wcfpqqp.tcf
+152165 wsww.gdd
+$ cd rtrbhtb
+$ ls
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+221078 jrhp.fsj
+dir sgm
+$ cd sgm
+$ ls
+dir tzzfc
+$ cd tzzfc
+$ ls
+207888 cdmht.jjn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd vgtvctd
+$ ls
+dir dtm
+dir gghjmgqs
+dir grcj
+dir lcpmlcpn
+57113 njpnzq.phl
+279566 rsgsrn
+59404 tzl
+221164 vcpzw.qsh
+$ cd dtm
+$ ls
+dir pmsvz
+dir zdzv
+$ cd pmsvz
+$ ls
+dir qctt
+$ cd qctt
+$ ls
+285640 wzh.hwv
+$ cd ..
+$ cd ..
+$ cd zdzv
+$ ls
+178732 fdvth.rvs
+dir jjslblcb
+dir tvq
+dir zgqjbf
+$ cd jjslblcb
+$ ls
+dir grcj
+$ cd grcj
+$ ls
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+$ cd ..
+$ cd ..
+$ cd tvq
+$ ls
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+$ cd ..
+$ cd zgqjbf
+$ ls
+276537 gldg.jrd
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd gghjmgqs
+$ ls
+238068 qqczbf
+$ cd ..
+$ cd grcj
+$ ls
+dir qnn
+$ cd qnn
+$ ls
+117284 jmst.mld
+$ cd ..
+$ cd ..
+$ cd lcpmlcpn
+$ ls
+dir cbzpzsj
+53036 frzslwl.qgd
+82430 grcj
+273768 pvzslpsn.ztw
+67092 rsgsrn
+$ cd cbzpzsj
+$ ls
+36456 gldg.jrd
+95656 mfmps.cfl
+2578 qpl.jhn
+225756 sqt.njp
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd vzgpfd
+$ ls
+266582 cgvcwrfn.jjq
+230770 dcgvw
+266361 gqqcqtp.hvq
+dir lnn
+86659 pzft.smj
+180519 qfszrvm.gnq
+dir rwrt
+dir thrthq
+dir zgqjbf
+$ cd lnn
+$ ls
+13294 dqqvbcf
+268614 mczrlg.vmz
+dir wqccmlvq
+dir zgqjbf
+$ cd wqccmlvq
+$ ls
+dir grcj
+$ cd grcj
+$ ls
+55504 gldg.jrd
+6925 jbqzth.rcj
+168475 jqzmc.sfm
+$ cd ..
+$ cd ..
+$ cd zgqjbf
+$ ls
+172255 nptpqjd.hzz
+$ cd ..
+$ cd ..
+$ cd rwrt
+$ ls
+78039 jrhp.cmf
+237632 mfmps
+$ cd ..
+$ cd thrthq
+$ ls
+122514 jrhp.fcj
+$ cd ..
+$ cd zgqjbf
+$ ls
+dir dpbnq
+dir mfmps
+dir rbnzhhn
+$ cd dpbnq
+$ ls
+dir vzgpfd
+$ cd vzgpfd
+$ ls
+278947 bhdtwf
+$ cd ..
+$ cd ..
+$ cd mfmps
+$ ls
+118315 mfmps.lbq
+$ cd ..
+$ cd rbnzhhn
+$ ls
+96386 svwv.ldj
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd zgqjbf
+$ ls
+196735 cmrdgjl.hbd
+$ cd ..
+$ cd ..
+$ cd lvhfqr
+$ ls
+dir njzv
+dir sgwzscp
+dir zgqjbf
+$ cd njzv
+$ ls
+60680 bmqh.snz
+129703 wcfpqqp.tcf
+$ cd ..
+$ cd sgwzscp
+$ ls
+dir rnjrj
+1799 vzgpfd
+37203 zgqjbf.jwf
+25768 zjh
+$ cd rnjrj
+$ ls
+242223 blrzc
+63563 plb.dlq
+$ cd ..
+$ cd ..
+$ cd zgqjbf
+$ ls
+91151 cmn.gcw
+235818 llsnw.phb
+$ cd ..
+$ cd ..
+$ cd zgvjpnf
+$ ls
+158932 nscv.wvb
+110912 wzm
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qjjgh
+$ ls
+dir cwslqsb
+34405 dcgvw
+dir fvmmd
+dir jrhp
+dir vflhljrl
+239915 vzgpfd
+$ cd cwslqsb
+$ ls
+49934 mqzfncgb.jbf
+$ cd ..
+$ cd fvmmd
+$ ls
+dir grcj
+dir jrhp
+dir sqmbncp
+dir vzgpfd
+$ cd grcj
+$ ls
+32276 bjgc
+211068 mfmps
+$ cd ..
+$ cd jrhp
+$ ls
+218633 wpqh.jfl
+$ cd ..
+$ cd sqmbncp
+$ ls
+137187 tzqqm.jqr
+$ cd ..
+$ cd vzgpfd
+$ ls
+258286 hqg.qzn
+dir mvqgb
+236455 vqdtns
+255724 wrnhw.mzf
+192529 zgqjbf.zzb
+$ cd mvqgb
+$ ls
+dir vzgpfd
+$ cd vzgpfd
+$ ls
+200955 grcj.wwl
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd jrhp
+$ ls
+86368 dcgvw
+16512 vzgpfd
+245341 wcfpqqp.tcf
+$ cd ..
+$ cd vflhljrl
+$ ls
+82670 gldg.jrd
+228251 nscv.wvb
+$ cd ..
+$ cd ..
+$ cd vpjqpqfm
+$ ls
+246705 gfff
+dir grcj
+dir hjdwrt
+dir mfmps
+dir plrrsmph
+dir rgqtzc
+175555 rsgsrn
+142983 wjpbr.hdr
+dir zlv
+$ cd grcj
+$ ls
+dir grcj
+dir mdvcmm
+285341 mfmps
+89089 nscv.wvb
+$ cd grcj
+$ ls
+dir fcdz
+dir fswpmd
+dir gvjjjp
+dir jrhp
+$ cd fcdz
+$ ls
+dir dpwvm
+dir rmmw
+$ cd dpwvm
+$ ls
+dir chjbpb
+118852 dcgvw
+dir dsc
+7271 fclhnmz.cbp
+$ cd chjbpb
+$ ls
+41211 pzr
+$ cd ..
+$ cd dsc
+$ ls
+217960 nscv.wvb
+$ cd ..
+$ cd ..
+$ cd rmmw
+$ ls
+dir cqzvcv
+dir hld
+99687 jrhp.nnb
+dir pfvthfw
+97451 qjmfdjwz.phc
+$ cd cqzvcv
+$ ls
+dir zgqjbf
+$ cd zgqjbf
+$ ls
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+$ cd ..
+$ cd ..
+$ cd hld
+$ ls
+113905 pwqs
+244609 wfsgg.jgp
+$ cd ..
+$ cd pfvthfw
+$ ls
+dir grcj
+$ cd grcj
+$ ls
+207441 jrhp
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd fswpmd
+$ ls
+99446 gldg.jrd
+$ cd ..
+$ cd gvjjjp
+$ ls
+dir pvzz
+279071 wdmm.vjv
+$ cd pvzz
+$ ls
+196937 nqfzj
+273491 nscv.wvb
+dir qthbl
+$ cd qthbl
+$ ls
+204553 dcgvw
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd jrhp
+$ ls
+175979 fct.dcg
+$ cd ..
+$ cd ..
+$ cd mdvcmm
+$ ls
+dir crscnnh
+109461 dcdtm.tvp
+279544 ftzvrpcw.pff
+124059 nnc
+274104 nscv.wvb
+dir ssvd
+dir zvvhlw
+$ cd crscnnh
+$ ls
+dir tzbjl
+$ cd tzbjl
+$ ls
+112219 wcfpqqp.tcf
+$ cd ..
+$ cd ..
+$ cd ssvd
+$ ls
+227906 bsqhzw
+$ cd ..
+$ cd zvvhlw
+$ ls
+166628 gldg.jrd
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd hjdwrt
+$ ls
+59644 jrhp.fjj
+dir rpsrm
+221706 rsgsrn
+dir rzn
+14344 tvlmvr.flr
+dir vlbrnq
+dir vrcns
+39113 wcfpqqp.tcf
+dir zhwm
+$ cd rpsrm
+$ ls
+282957 wmpnpjzd
+$ cd ..
+$ cd rzn
+$ ls
+142973 wcfpqqp.tcf
+$ cd ..
+$ cd vlbrnq
+$ ls
+79661 ccznjt.fqr
+$ cd ..
+$ cd vrcns
+$ ls
+262645 dcnnnhn.vhg
+$ cd ..
+$ cd zhwm
+$ ls
+dir glgs
+dir grcj
+dir jrhp
+$ cd glgs
+$ ls
+282326 tcw.qnb
+$ cd ..
+$ cd grcj
+$ ls
+43293 qnqb.jqg
+$ cd ..
+$ cd jrhp
+$ ls
+197274 pgf.ltc
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mfmps
+$ ls
+dir dcm
+47902 mrcn.wtb
+8444 mzdgdh.ctn
+$ cd dcm
+$ ls
+72397 mnrvqg.vmm
+$ cd ..
+$ cd ..
+$ cd plrrsmph
+$ ls
+216816 gldg.jrd
+148190 jzbswh
+120319 wcfpqqp.tcf
+dir zgqjbf
+$ cd zgqjbf
+$ ls
+dir cfdr
+dir hdsnc
+$ cd cfdr
+$ ls
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+$ cd ..
+$ cd hdsnc
+$ ls
+43772 ccds.vlz
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rgqtzc
+$ ls
+dir dblznh
+dir lfpdqm
+dir lmnmthm
+dir mfmps
+dir pcplzs
+dir pvfbjm
+dir rnl
+dir wqgp
+dir zgqjbf
+$ cd dblznh
+$ ls
+65168 tdv.mwq
+$ cd ..
+$ cd lfpdqm
+$ ls
+dir cgvnspv
+dir dthhvrln
+dir jrhp
+dir vzgpfd
+$ cd cgvnspv
+$ ls
+dir qnmg
+$ cd qnmg
+$ ls
+dir grcj
+70937 jbvrp.psn
+207093 vfgds.tjv
+282330 vtlzgq.dfd
+251235 zbvgc.whr
+$ cd grcj
+$ ls
+dir pbn
+$ cd pbn
+$ ls
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+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd dthhvrln
+$ ls
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+$ cd ..
+$ cd jrhp
+$ ls
+dir bqf
+5738 rgpwf
+dir zjhw
+$ cd bqf
+$ ls
+dir clgjfn
+58416 fcr
+216467 mcdqnw.prv
+288978 zthdgfhl.lqq
+$ cd clgjfn
+$ ls
+274929 lwnpggm.mfp
+$ cd ..
+$ cd ..
+$ cd zjhw
+$ ls
+dir cbwrrzwh
+dir fdz
+dir grcj
+219439 grcj.szv
+285756 mfmps
+113288 mmg.cpr
+236059 nmq
+dir pbnfdq
+74013 tvmswr
+dir zgqjbf
+$ cd cbwrrzwh
+$ ls
+223425 zgqjbf.ffm
+$ cd ..
+$ cd fdz
+$ ls
+dir wbtzsr
+$ cd wbtzsr
+$ ls
+257781 hzf
+$ cd ..
+$ cd ..
+$ cd grcj
+$ ls
+58266 dcgvw
+dir rhncgdll
+dir vzgpfd
+12503 zgv.ndt
+$ cd rhncgdll
+$ ls
+dir vnmbhbhc
+$ cd vnmbhbhc
+$ ls
+10019 lfcggd.ccw
+$ cd ..
+$ cd ..
+$ cd vzgpfd
+$ ls
+134965 zdsp.tzg
+78684 zmjjvf.glv
+$ cd ..
+$ cd ..
+$ cd pbnfdq
+$ ls
+173729 frqdqhw
+dir fvjc
+41055 svwd
+106934 tngzpl.lml
+dir zqhjjjd
+$ cd fvjc
+$ ls
+88907 pcvcpptp.dsr
+133102 tszsbtjp.lfl
+$ cd ..
+$ cd zqhjjjd
+$ ls
+61260 mpdlcjl
+dir wfw
+$ cd wfw
+$ ls
+dir jrhp
+dir lwg
+226393 rndnc
+dir zhrtj
+$ cd jrhp
+$ ls
+276912 dcgvw
+dir pwrjq
+dir zmnv
+$ cd pwrjq
+$ ls
+198180 vclfmjf.tfp
+$ cd ..
+$ cd zmnv
+$ ls
+84228 mfmps.wzw
+$ cd ..
+$ cd ..
+$ cd lwg
+$ ls
+dir jrhp
+50562 lwcfwjh.dtm
+145174 vnl
+$ cd jrhp
+$ ls
+86877 dcgvw
+$ cd ..
+$ cd ..
+$ cd zhrtj
+$ ls
+284728 rsgsrn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd zgqjbf
+$ ls
+202268 zqpvm
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd vzgpfd
+$ ls
+138188 djqqfrbn.cps
+$ cd ..
+$ cd ..
+$ cd lmnmthm
+$ ls
+2715 fqdm.bvm
+37482 jdsn.zpr
+255467 nscv.wvb
+175914 stvscbg
+$ cd ..
+$ cd mfmps
+$ ls
+288712 gldg.jrd
+182389 jrhp
+dir lvjg
+41815 nscv.wvb
+dir vzgpfd
+dir zgqjbf
+dir zvpnq
+$ cd lvjg
+$ ls
+184529 wcfpqqp.tcf
+$ cd ..
+$ cd vzgpfd
+$ ls
+265556 hjqng.glq
+$ cd ..
+$ cd zgqjbf
+$ ls
+dir dqmbmlrf
+dir grcj
+dir hlsr
+$ cd dqmbmlrf
+$ ls
+dir bdvhvwct
+254123 bzhhm.rqp
+172950 fgqbj.bcb
+7417 fjfq.qbv
+188707 hfvvlvqg.sqh
+78273 ppljtfjr.hpm
+dir zgqjbf
+$ cd bdvhvwct
+$ ls
+76840 gldg.jrd
+dir grcj
+$ cd grcj
+$ ls
+dir vzgpfd
+$ cd vzgpfd
+$ ls
+73163 mfmps.tnr
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd zgqjbf
+$ ls
+62316 lpzsww
+$ cd ..
+$ cd ..
+$ cd grcj
+$ ls
+160721 bwvgdqdr
+$ cd ..
+$ cd hlsr
+$ ls
+214688 vzgpfd
+$ cd ..
+$ cd ..
+$ cd zvpnq
+$ ls
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+165326 mfmps.gfp
+dir rwddqchj
+dir ssw
+dir zgqjbf
+$ cd rwddqchj
+$ ls
+dir gnsndln
+$ cd gnsndln
+$ ls
+223320 zgqjbf.wlm
+$ cd ..
+$ cd ..
+$ cd ssw
+$ ls
+dir grcj
+$ cd grcj
+$ ls
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+$ cd ..
+$ cd ..
+$ cd zgqjbf
+$ ls
+45732 vzgpfd.nbz
+86126 zdnv.sss
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd pcplzs
+$ ls
+90287 grcj
+99213 rsgsrn
+dir shmsp
+156357 tgc.lzp
+dir thbznt
+dir vtqlszrs
+dir vzgpfd
+$ cd shmsp
+$ ls
+dir jrhp
+$ cd jrhp
+$ ls
+132784 tmlntm
+$ cd ..
+$ cd ..
+$ cd thbznt
+$ ls
+190697 mdj.lll
+270626 wcfpqqp.tcf
+$ cd ..
+$ cd vtqlszrs
+$ ls
+44292 dcgvw
+$ cd ..
+$ cd vzgpfd
+$ ls
+13921 hccgnjqh.cdl
+dir jrhp
+23850 jvq
+113952 mfmps
+dir ppdfjqbr
+dir vdpvzhrs
+190631 vzgpfd
+128060 wclfwhv.chh
+dir wghzqb
+$ cd jrhp
+$ ls
+237755 bgbmnpq
+19551 dcgvw
+$ cd ..
+$ cd ppdfjqbr
+$ ls
+1458 dcgvw
+563 gldg.jrd
+155487 glhjmpm.sjt
+dir vthf
+dir vzgpfd
+81314 zgqjbf.scm
+$ cd vthf
+$ ls
+205316 vzgpfd.qlg
+$ cd ..
+$ cd vzgpfd
+$ ls
+46597 mfmps.zsq
+$ cd ..
+$ cd ..
+$ cd vdpvzhrs
+$ ls
+13302 vcwrr.jvb
+$ cd ..
+$ cd wghzqb
+$ ls
+dir grcj
+dir hbngsg
+112293 jzvh.pvf
+282888 smrq.lvp
+$ cd grcj
+$ ls
+258764 nscv.wvb
+230478 qpqgf
+$ cd ..
+$ cd hbngsg
+$ ls
+101699 bzwnwz.tgj
+144196 hwjrgtt.pdm
+dir mthnljv
+$ cd mthnljv
+$ ls
+1397 jrhp.rvp
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd pvfbjm
+$ ls
+251602 nscv.wvb
+$ cd ..
+$ cd rnl
+$ ls
+233954 dqlncnds.dfn
+dir nswpmqdd
+$ cd nswpmqdd
+$ ls
+261883 rtpbgm.gbf
+$ cd ..
+$ cd ..
+$ cd wqgp
+$ ls
+23813 pdfcfc
+$ cd ..
+$ cd zgqjbf
+$ ls
+15126 bvlbrq.pdj
+dir jnjqhzh
+dir smrzsq
+dir vzgpfd
+$ cd jnjqhzh
+$ ls
+243919 htdqwdc.nsr
+254015 ppclcr.rms
+234928 zmjr.hnt
+$ cd ..
+$ cd smrzsq
+$ ls
+dir ljvbmm
+$ cd ljvbmm
+$ ls
+235241 jmcbrbdl.ccr
+$ cd ..
+$ cd ..
+$ cd vzgpfd
+$ ls
+dir bhwd
+38855 dcgvw
+dir hdcqm
+dir swcvhtmp
+dir zgqjbf
+118104 zhtlsdb.ncw
+$ cd bhwd
+$ ls
+122018 gldg.jrd
+dir lmjr
+dir mfmps
+$ cd lmjr
+$ ls
+40588 dcgvw
+$ cd ..
+$ cd mfmps
+$ ls
+dir grcj
+$ cd grcj
+$ ls
+165840 zwbvbfj
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd hdcqm
+$ ls
+156543 qfb.vhv
+$ cd ..
+$ cd swcvhtmp
+$ ls
+227964 rrfnsqw.rvh
+$ cd ..
+$ cd zgqjbf
+$ ls
+94269 mfmps.jsq
+266360 rsgsrn
+252761 zlz
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd zlv
+$ ls
+127388 nscv.wvb
diff --git a/day7/package.json b/day7/package.json
new file mode 100644
index 0000000..29c5523
--- /dev/null
+++ b/day7/package.json
@@ -0,0 +1,5 @@
+{
+  "devDependencies": {
+    "@types/node": "^18.11.10"
+  }
+}
diff --git a/day7/solution.ts b/day7/solution.ts
new file mode 100644
index 0000000..a459f5a
--- /dev/null
+++ b/day7/solution.ts
@@ -0,0 +1,156 @@
+import { readFileSync } from 'fs';
+import { join } from 'path';
+
+enum ftype {
+  File = 1,
+  Directory,
+}
+
+class File {
+  fileType: ftype;
+  name: string;
+  size: number;
+  parent?: string;
+  children?: string[];
+
+  constructor(fileType: ftype, name: string, size: number, parent?: string, children?: string[]) {
+    this.fileType = fileType;
+    this.name = name;
+    this.size = size;
+    this.parent = parent;
+    this.children = children;
+  }
+
+}
+
+const fileString = readFileSync(join(__dirname, "input"), 'utf-8');
+var commands = fileString.trim().split("$ ");
+commands = commands.filter(val => {
+  return val.length > 0;
+})
+commands = commands.map(val => {
+  return val.trim();
+})
+var parsedCommandsSp = commands.map(val => {
+  return val.split("\n");
+})
+var parsedCommands = parsedCommandsSp.map(val => {
+  return val.map(vval => {
+    return vval.split(" ");
+  });
+})
+
+var files = {};
+var currentDir = ""
+
+function getDirSize(dirname: string): number {
+
+  const f = files[dirname];
+  if (f.fileType != ftype.Directory) {
+    return -1;
+  }
+  var sum = 0;
+  for (const c of f.children) {
+    if (files[c].fileType == ftype.File) {
+      sum += files[c].size;
+    } else {
+      sum += getDirSize(c);
+    }
+  }
+  return sum;
+}
+
+function generateFullPath(fname: string): string {
+  if (fname == '') {
+    return '';
+  }
+  return generateFullPath(files[fname].parent) + fname;
+}
+
+for (var i = 0; i < parsedCommands.length; i++) {
+  const commandSet = parsedCommands[i]
+  if (commandSet[0][0] == "cd") {
+    var dname = commandSet[0][1]
+    if (dname == "..") {
+      currentDir = files[currentDir].parent
+    } else {
+      const fname = generateFullPath(currentDir) + dname;
+      if (!(fname in files)) {
+        files[fname] = new File(
+          ftype.Directory,
+          fname,
+          0,
+          currentDir,
+          []
+        );
+        if (currentDir != "") {
+          files[currentDir].children.push(fname);
+        }
+      }
+      currentDir = fname;
+    }
+  } else if (commandSet[0][0] == "ls") {
+    for (const fs of commandSet.slice(1)) {
+      const typeOrSize = fs[0];
+      const name = fs[1];
+      const fname = generateFullPath(currentDir) + name;
+      if (typeOrSize == 'dir') {
+        if (!(fname in files)) {
+          files[fname] = new File(
+            ftype.Directory,
+            fname,
+            0,
+            currentDir,
+            []
+          );
+          if (currentDir != "") {
+            files[currentDir].children.push(fname);
+          }
+        }
+      } else {
+        const fsize: number = +typeOrSize;
+        if (!(fname in files)) {
+          files[fname] = new File(
+            ftype.File,
+            fname,
+            fsize,
+            currentDir,
+            []
+          );
+          if (currentDir != "") {
+            files[currentDir].children.push(fname);
+          }
+        }
+      }
+    }
+  }
+}
+
+const LIMIT = 100000;
+var fsum =  0;
+var sizes = [];
+for (const key in files) {
+  const f = files[key];
+  if (f.fileType == ftype.Directory) {
+    const s = getDirSize(key);
+    sizes.push(s);
+    if (s <= LIMIT) {
+      fsum += s;
+    }
+  }
+}
+console.log(fsum);
+
+const TOTAL = 70000000;
+const THRESH = 30000000;
+const FREE = TOTAL - getDirSize("/");
+
+var small = 1000000000000000;
+for (const size of sizes) {
+  if ((FREE + size) > THRESH) {
+    if (size < small) {
+      small = size;
+    }
+  }
+}
+console.log(small);
diff --git a/day7/tsconfig.json b/day7/tsconfig.json
new file mode 100644
index 0000000..80c821c
--- /dev/null
+++ b/day7/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "types": [
+      "node"
+    ]
+  }
+}