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Utreexo: compressing ntau UTXO Bitcoin

Luam tawm rau

Nyob zoo, Habr! Hauv Bitcoin network, tag nrho cov nodes, los ntawm kev pom zoo, pom zoo rau ib txheej ntawm UTXOs: pes tsawg npib muaj rau kev siv, rau leej twg raws nraim, thiab nyob rau hauv dab tsi tej yam kev mob. UTXO teeb yog qhov tsawg kawg nkaus ntawm cov ntaub ntawv xav tau rau lub validator node, yam tsis muaj qhov node yuav tsis muaj peev xwm txheeb xyuas qhov siv tau ntawm cov khoom xa tuaj thiab cov blocks uas muaj lawv. Hauv qhov no, kev sim ua tau ua [...]

Parsing 25TB siv AWK thiab R

Luam tawm rau

Yuav ua li cas nyeem tsab xov xwm no: Kuv thov txim tias cov ntawv nyeem ntev heev thiab chaotic. Txhawm rau txuag koj lub sijhawm, Kuv pib txhua tshooj nrog "Qhov Kuv Kawm Tau Li Cas" kev taw qhia, uas qhia txog cov ntsiab lus ntawm tshooj hauv ib lossis ob kab lus. "Tsuas qhia kuv qhov kev daws teeb meem!" Yog tias koj tsuas yog xav pom qhov kuv tau los nrog, hla mus rau tshooj “Ua Ntau Qhov Tsim Kho,” tab sis […]

Cable TV tes hauj lwm rau me nyuam yaus. Ntu 9: Headend

Luam tawm rau

Lub headend sau cov cim los ntawm ntau qhov chaw, ua lawv thiab tshaj tawm lawv mus rau cable network. Cov ntsiab lus ntawm cov kab lus ntu 1: Kev tsim qauv dav dav ntawm CATV network Ntu 2: Kev sib xyaw thiab cov duab ntawm lub teeb liab Ntu 3: Analog tivthaiv ntawm lub teeb liab Ntu 4: Cov khoom siv digital ntawm lub teeb liab Part 5: Coaxial distribution network Part 6: RF Teeb liab amplifiers Ntu 7: Optical receivers Part 8: Optical […]

Yuav daws li cas NP-Hard teeb meem nrog Parameterized algorithms

Luam tawm rau

Kev tshawb fawb ua haujlwm yog kab tias qhov nthuav tshaj plaws ntawm peb qhov kev cob qhia. Lub tswv yim yog sim koj tus kheej hauv koj txoj kev xaiv thaum tseem nyob hauv tsev kawm qib siab. Piv txwv li, cov tub ntxhais kawm los ntawm thaj chaw ntawm Software Engineering thiab Machine Learning feem ntau mus ua kev tshawb fawb hauv cov tuam txhab (feem ntau yog JetBrains lossis Yandex, tab sis tsis yog xwb). Hauv tsab ntawv no kuv yuav tham txog kuv qhov project hauv Computer Science. […]

Bitcoin tau tshaj $ 9000 thawj zaug xyoo no

Luam tawm rau

Hnub Sunday dhau los, Bitcoin tau tshaj $ 9000 thawj zaug xyoo no. Raws li cov peev txheej CoinMarketCap, lub sijhawm kawg tus nqi ntawm qhov loj tshaj plaws cryptocurrency ntawm kev ua lag luam yog ntau dua $ 9000 yog ntau tshaj ib xyoos dhau los, thaum pib lub Tsib Hlis 2018. Xyoo no, Bitcoin pib nce zog dua. Qhov no tsis yog thawj zaug uas nws tau teeb tsa tus nqi tshiab txhua xyoo. Ntau […]

Yandex yuav cob qhia cov neeg tsim khoom ntawm cov kev pabcuam zoo thiab txhim khu kev qha hauv Python

Luam tawm rau

Yandex tshaj tawm qhov kev tshaj tawm ntawm ob txoj haujlwm kev kawm rau cov neeg tsim khoom siv rov qab siv cov lus qhia dav dav dav dav rau Python. Lub tsev kawm ntawv puv sij hawm ntawm Backend Development tab tom tos cov neeg pib tshiab, thiab qhov tshwj xeeb hauv online hauv Yandex.Practice yog rau cov neeg pib tshiab uas xav paub txog txoj haujlwm los ntawm kos. Nws raug sau tseg tias lub tsev kawm ntawv tshiab yuav qhib nws lub qhov rooj rau lub caij nplooj zeeg no hauv Moscow. Qhov kev cob qhia yuav siv sijhawm li ob lub hlis. Cov tub ntxhais kawm yuav mloog [...]

Mail.ru yuav pab cov tsim tawm tsim AAA tua rau consoles thiab lawv tus kheej studio

Luam tawm rau

MY.GAMES, qhov kev faib ua si ntawm Mail.ru Group, muaj kev paub dhau los hauv kev txhawb nqa thiab txhawb nqa nrov browser thiab mini-games, uas tsim cov ntawv teev npe nplua nuj ntawm cov phiaj xwm online ntawm ntau yam. Tab sis lub sijhawm no pab pawg tau txiav txim siab coj nws mus rau qib hnyav dua thiab pab cov neeg txawj ntse tsim cov yeeb yaj kiab ua yeeb yaj kiab thawj zaug rau consoles. Lub tuam txhab tau npaj nyiaj txiag los txhim kho qhov kev ua si thiab muab rau pab pawg nws tus kheej studio […]

Instagram tab tom sim ua kom yooj yim rov qab los ntawm hacked accounts

Luam tawm rau

Cov peev txheej hauv network tau tshaj tawm tias social network Instagram tab tom sim ib txoj hauv kev tshiab los kho cov neeg siv nyiaj. Yog tias tam sim no koj xav tau hu rau lub network kev pabcuam kev ruaj ntseg kom rov qab tau koj tus as khauj, tom qab ntawd yav tom ntej cov txheej txheem no tau npaj kom yooj yim dua. Txhawm rau rov kho koj tus lej siv tus txheej txheem tshiab, koj yuav tsum muab cov ntaub ntawv ntiag tug, suav nrog koj tus lej xov tooj ntawm tes lossis email chaw nyob. […]

Samsung ceeb toom koj kom tsis tu ncua luam theej duab koj lub TV ntse rau malware

Luam tawm rau

South Kauslim tuam txhab Samsung ceeb toom cov tswv TV ntse kom tsis tu ncua luam theej duab lawv cov firmware rau malware. Cov ntawv tshaj tawm sib raug tau tshwm sim ntawm Samsung nplooj ntawv txhawb nqa ntawm Twitter, uas hais tias koj tuaj yeem tiv thaiv malware tawm tsam ntawm koj lub TV los ntawm kev tshuaj xyuas txhua ob peb lub lis piam. Tawm tsam keeb kwm yav dhau los ntawm cov lus no, lub ntuj tsim tag nrho […]

Tso tawm DragonFly BSD 5.6 operating system

Luam tawm rau

Kev tso tawm ntawm DragonFlyBSD 5.6 yog muaj, ib qho kev khiav hauj lwm nrog lub hybrid kernel tsim nyob rau hauv 2003 rau lub hom phiaj ntawm lwm txoj kev loj hlob ntawm FreeBSD 4.x ceg. Ntawm cov yam ntxwv ntawm DragonFly BSD, peb tuaj yeem hais txog qhov kev faib tawm cov ntaub ntawv HAMMER, kev txhawb nqa rau kev thauj khoom "virtual" system kernels raws li cov neeg siv cov txheej txheem, muaj peev xwm cache cov ntaub ntawv thiab FS metadata ntawm SSD drives, cov ntsiab lus sib txawv ntawm cov cim sib txuas, muaj peev xwm. kom khov cov txheej txheem […]

Vulnerabilities nyob rau hauv Linux thiab FreeBSD TCP pawg ua rau cov chaw taws teeb tsis lees paub txog kev pabcuam

Luam tawm rau

Netflix tau txheeb xyuas ntau qhov tsis txaus ntseeg hauv TCP pawg ntawm Linux thiab FreeBSD uas tuaj yeem ua rau lub pob tawg lossis ua rau muaj kev siv ntau dhau thaum ua cov pob khoom tshwj xeeb TCP (pob ntawv-ntawm-tuag). Cov teeb meem yog tshwm sim los ntawm kev ua yuam kev hauv cov neeg tuav haujlwm rau qhov loj tshaj plaws ntawm cov ntaub ntawv thaiv hauv TCP pob ntawv (MSS, Qhov loj tshaj plaws ntu) thiab cov txheej txheem rau kev xaiv kev lees paub ntawm kev sib txuas (SACK, TCP Selective Acknowledgment). CVE-2019-11477 (SACK Panic) […]

CERN tsis kam Microsoft cov khoom

Luam tawm rau

European Nuclear Research Center yuav tso tseg tag nrho cov khoom lag luam hauv nws txoj haujlwm, thiab feem ntau los ntawm Microsoft cov khoom. Hauv xyoo dhau los, CERN nquag siv ntau yam khoom lag luam kaw vim nws ua kom yooj yim nrhiav cov kws tshaj lij kev lag luam. CERN koom tes nrog ntau lub tuam txhab thiab lub koom haum, thiab nws yog ib qho tseem ceeb rau nws ua [...]

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