Yunchang Guan

@guanyu

Afghanistan, Afghanistan

Joined Jul 2017

World Rank: #18 (389.4 points)

Institution: Institution

Activity over the last year

Effectiveness

 Problems solved
1232
 Solutions submitted
50359

Problems

List of solved classical problems:

ABA12C BITPLAY DONALDO HORRIBLE MINSTACK PLSQUARE SUBMERGE
ABA12D BLACKOUT DOORSPEN HOTELS MINSTOCK PMATRIX SUBS
ABCD BLBONO DOTAA HPYNOS MINSUB POKER SUBSEQ
ABCDEF BLCONE DP HRSIAM MISERMAN POLEVAL SUBSET
ABCPATH BLINNET DQUERY HS08PAUL MIXTURES POLICEMEN SUBSN
ABSP1 BLMIRANA DRACULA HS10SQFT MKEQUAL POLQUERY SUBST1
ABSURD BOI7SEQ DRAGKING HUBULLU MKJUMPS POLYEQ SUBSUMS
ABSYS BOI7SOU DRINK IAPCR2D MKTHNUM POLYMUL SUBXOR
ACMT BOKAM143SOU DRTREE IAPCR2F MLASERP POLYNOM SUB_PROB
ACODE BOMBER DRUIDEOI IBIGAME MLK PON SUMFOUR
ACPC10A BOOKS1 DSUBSEQ ICANDIES MMASS POSTERIN SUMITR
ACPC10B BOOKWORM DUKKAR IE1 MMATRIX POSTERS SUMMATION
ACPC10D BORING DWARFLOG IE2 MMAXPER POTHOLE SUMMUL
ACPC10E BORW DYNACON1 IE4 MMINPAID POUR1 SUMSUM
ACPC11B BOTTOM DYNACON2 IEEEBGAM MMMGAME POWERCAR SUMSUMS
ACQUIRE BOXES DYNALCA IGAME MOBIVINA POWPOW2 SUPPER
ACTIV BPM EAGLE1 IGOR MOD PPATH SWAPS
ADAAPPLE BRCKTS EASYMATH IITKWPCA MOHIB PQUEUE SYNC13C
ADABANKET BRDGHRD EASYPROB IITKWPCE MON2012 PR003004 TAKIN
ADABERRY BRIDGE EC_CONB IITKWPCG MONKK PRADIPSUM TANKS
ADABLOOM BRKSTRNG EC_MODE IITKWPCH MONO PRATA TAP2012A
ADABRANC BROKEN EC_P IITKWPCI MONODIG PRETILE TAP2012B
ADACABAA BSHEEP EDIST IITKWPCJ MORSE PRHYME TAP2012C
ADACAROT BTCODE_G EDIT IITKWPCN MOZHCAN PRIME TAP2012D
ADACHERY BUBBLESORT EGYPIZZA ILKQUERY MOZHSLM PRIME1 TAP2012E
ADACLEAN BUD13TLF EIGHTS ILKQUERYIII MOZHSLS PRINT TAP2012F
ADACOINS BUGLIFE EIUASSEMBLY IM MPILOT PRMFN TAP2012H
ADACON BUSINESS EKO IMPER MPOINT PRMQUER TAP2013G
ADACROP BUSYMAN ELEVTRBL INCARDS MREPLBRC PRO TAP2013H
ADACUT BUZZW EMOTICON INCSEQ MSCHED PROBLEM4 TAP2013I
ADACYCLE BWORK EMTY2 INDIPROG MSE06H PROFIT TAP2014B
ADADIG BYECAKES ENIGMATH INGRED MSE06I PROOT TAP2014C
ADADUNG BYTESE1 EOPERA INS14A MSKYCODE PRUBALL TAP2014E
ADAFIELD BYTESE2 EPALIN INS14C MSTRMND PSTR TAP2014F
ADAFIMBR BYTESM2 EQU2 INS14F MSTS PSTRING TAP2014G
ADAFRIEN C1LJUTNJ EQUI INS14G MSUBSTR PSWITCH TAP2014I
ADAFTBLL CADYDIST ESCJAILA INS14H MTOTALF PSYCHON TAP2014J
ADAFUROW CAM5 ESJAIL INTEGER1 MTREE PSYCHOT TAP2015B
ADAGAME CANDY ETF INTERVAL MTREECOL PT07C TAP2015C
ADAGCD CANDY3 ETFD INTSUB MTRIAREA PT07F TAP2015D
ADAGRAFT CANTON ETFS INUMBER MUDDY PT07J TAP2015H
ADAHW CAPCITY EVENFRQ INVCNT MUL PT07X TAP2015I
ADAINDEX CARDSHUF EXPEDI INVDIV MUL2COM PT07Y TAP2015J
ADAJOBS CARINA EXPOR INVPHI MULSORT PT07Z TAP2016C
ADAKOHL CASHIER FACEFRND IOIPALIN MULTII PTIME TAP2016F
ADALICI CATINV FACENEMY IOPC1207 MULTQ3 PUCMM223 TAP2016G
ADALIST CATM FACT0 IPL1 MUSKET PUCMM334 TAP2016J
ADAMATCH CATTACK FACT1 ISAB MYQ10 PWRANDMOD TAP2016L
ADAMOLD CBANK FACTCG2 JARJAR NABILHACKER PYRA TAXI
ADANUM CCHESS FACTMUL JAVAC NABILISU QCJ3 TAXI2
ADAORANG CDC12_H FACTMULN JEDNAKOS NACCI QCJ4 TBATTLE
ADAPATH CDOWN FACVSPOW JGTLE NAJGC QMAX3VN TBGAME
ADAPET CDRSANJ FAILURE JNEXT NAJPF QN01 TDKPRIME
ADAPHOTO CEPC08B FAKETSP JOCHEF NAJPWG QTDIVIDE TDPRIMES
ADAPLANT CEQU FALTAENV JOKER1 NAKANJ QTREE TEAM2
ADAPOWER CERC07C FANCY JOSWAP NANO QTREE2 TEMPLEQ
ADAQUEUE CERC07K FARIDA JULKA NAPTIME QTREE4 TESSER
ADARAIN CERC07S FASHION JZPCIR NASPRIM QTREE5 TEST
ADASALE CF25E FASTFLOW JZPEXT NATALIAG QTREE6 TETRA
ADASEQEN CGBOY FAVDICE JZPGYZ NDIV QTREE7 TFOSS
ADASTRNG CHAIN FCANDY JZPLIT NDIVPHI QUE2 TFRIENDS
ADASUM CHARGY FCDC KALTSUM NDS QUEEN THRBL
ADATEAMS CHASE FCTRL KAOS NDT QUERYSTR THREECOL
ADATREE CHASE1 FCTRL2 KATHTHI NECKLACE QUEST4 THREENUMBERS
ADATRIP CHICAGO FENCE1 KFSTB NEG2 QUILT TIP1
ADAUNIQ CHOCOLA FIBOSQRT KGSS NETADMIN R6PL TIPTOP
ADAUSORT CIJEVI FIBOSUM KITROB NEXTLEX RACETIME TLE
ADAVISIT CIRCLE_E FIBTWIST KMEDIAL NFACTOR RANDMOD TMSUM
ADDREV CIRU FILRTEST KNIGHTS NG0FRCTN RANGESUM TOANDFRO
ADFRUITS CIRUT FINDPRM KNMOVE NGCD RANJAN02 TOE1
ADRABR CISTFILL FINDSR KOICOST NGIRL RAONE TOE2
ADVEDIST CITY2 FINFRAC KOIREP NGM RATING TOHMOVE2
AE00 CLEANRBT FISHER KOMPICI NGM2 RCB TOHU
AE2A CLFLARR FLIB KOPC12A NHAY REAYZCODETST TORNJEVI
AFS CLOPPAIR FLOWERS KOSARE NICEBTRE RECTANGL TOSCORE
AGGRCOW CLSLDR FN16ASGN KOZE NICEDAY REDARR2 TOUR
AGPC01G CLZSTRNG FN16CEIL KPGAME NICESEQ RENT TOURIST
AHOCUR CMEXPR FOODIES KPMATRIX NINJA2 REPEATS TPCPALIN
AIBOHP CMG FOXLINGS KPMAZE NINJA3 RIOI_2_3 TPGA
AKBAR CMPLS FP KPOWERSUM NINJA5 RIOI_3_2 TRAFFICN
AKVQLD03 CNTDO FPLAN KPRIMESB NITK06 RKS TRANCLS
ALCATRAZ2 CNTINDX FPOLICE KPSUM NITT8 RMID TRANSP
ALICESIE CNTINDX2 FREQ2 KQUERY NITTROAD RMID2 TRANSP2
ALIEN CNTPRIME FREQUENT KQUERYO NKDIV ROADS TREECST
ALIENS COCONUTS FRND KSMALL NOCHANGE ROCK TREEDEGREE
ALL CODECODE FRNDCIRC KULE NORMA2 ROCKETS TREEISO
ALLIN1 CODEIT03 FRNDZND KURUK14 NOSQ ROHAAN TREEORD
ALLIZWEL CODEM4 FRQPRIME LABYR1 NOTATRI ROOBOT TREEPAL
ALONE CODERE3 FTOUR2 LARMY NOVICE43 ROOTCIPH TREESUM
ALTSEQ CODESPTB FUNPROB LAS NPC2014A RPAR TRICOUNT
ALWFACT CODFURY FURYROAD LASER_BEAM NPC2014F RPLA TRIGALGE
AMBIG COINS GAME2 LASTDIG NPC2015A RPLB TRIKA
AMBLE COLONY GAME3 LASTDIG2 NPC2015D RPLC TRIPINV
AMBM COMDIV GAMES LASTSHOT NPC2015F RPLL TRNGL
AMR10C COMPANYS GARDENAR LAZYPROG NPC2016A RPLN TROOPS
AMR10G CONDUIT GCD2 LCA NPC2016C RRANGE TRT
AMR11A CONSEC GCDEX LCMSUM NPC2016E RRSCHED TRVCOST
AMR11B CORNET GCDEX2 LCPC11B NQUEEN SABBIRGAME TRYCOMP
AMR11D COT GCDS LCPC12F NSQUARE SALMAN TSHOW1
AMR11E COT2 GCJ082A LCS NSTEPS SAM TSUM
AMR11J COT3 GCJ101BB LCS2 NSUBSTR SAMER08A TTM
AMR12D COT4 GCJ1C09A LCS3 NSUBSTR2 SAMER08C TTTABLE
AMR12I COUNT GCJ1C09C LDP NSYSTEM SAMER08D TULIPNUM
AMZRCK COUNT1IT GCPC11B LEXSTR NTG SAMER08F TUTMRBL
AMZSEQ COURAGE GCPC11I LFM NTHPRIME SAMTWARR TWENDS
ANARC05B COURIER GCPC11J LGLOVE NTICKETS SAS001 TWINSNOW
ANARC05H COVER GDCOFTI LIGHTIN NUB04 SBANK TWIST
ANARC07C COWCAR GEEKOUNT LIM NUM06 SBETS TWOGAME
ANARC07G CPAIR2 GEN LINEGAR NUM08 SBO TWOKINGS
ANARC08A CPATTERN GEOM LINES NUMOFPAL SCALES TWOPATHS
ANARC08B CPCRC1C GEOPROB LINEUP NUMPATH SCAVHUNT TWOPROF
ANARC08F CPRIME GERGOVIA LIS2 NUMTH02 SCITIES TWOSQRS
ANARC08G CPRMT GGD LISA NUMTHEO01 SCPC11H UCBINTG
ANARC08H CRAN02 GHOSTS LITE NUMTSN SCRAPER UCI2009D
ANARC09A CRAN04 GIRLSNBS LITEPIPE NWERC04H SCUBADIV UCODES
ANARC09B CRDS GIVEAWAY LKS NWERC11F SEGMENTS UCV2013B
ANARC09F CROSSOVER GLJIVE LMCONSTR NWERC11H SEGSQRSS UCV2013E
ANDROUND CRSCNTRY GNY07D LOCKER NY10A SELLPHN2 UCV2013H
ANGELS CRYPTON GNY07F LONGCS NY10E SELTEAM UCV2013I
ANTP CRZYSMKR GNY07H LOOPEXP ODDDIV SEQ UCV2013J
ANTTT CSTREET GNYR09F LOSTNSURVIVED OEN SEQ2 UJ
AP2 CSUBSEQS GOALFR LOVEGURU OFFSIDE SERGEARS UJ01
APIO10A CTGAME GOC11A LPIS OIL SERGRID ULM02
APIO14_A CTRICK GOC11B LQDCANDY OILCOMP SERVICE ULM09
APM CTTC GONDOR LTRAFFIC OLOLO SFN UOFTAE
APS CUBEFR GONE LUCIFER ONEZERO SGAME UPDATEIT
APS2 CUBNUM GOO LUCKYNUM ONP SGIFT VBOSS
ARBITRAG CUTSQRS GOODB LVADER OPCPIZZA SHAHBG VCIRCLES
ARCTAN CVJETICI GOODG M00PAIR OPMODULO SHAKILKEYWORD VECTAR1
ARDA1 CVXPOLY GOT M3TILE OPTM SHAKTI VECTAR10
AREA1 CWORLD GPA1 MAGSUB1 ORDERS SHELF VECTAR5
ARITH2 CZ_PROB1 GRAFFDEF MAIN111 ORDERSET SHOP VECTAR8
ARMY DAGCNT2 GRASSPLA MAIN112 ORDSUM23 SHOP2 VENOM
ARRAYSUB DANGER GRE MAIN72 ORGNZ SHPATH VFMUL
ASCDFIB DAVIDG GREED MAIN75 OTOCI SHUB1307 VHUFFM
ASSIGN DBALLZ GRZZ MAIN8_C OVGDEL SICRANO VILLAGES
ASSIGN4 DCEPC11B GS MAKEMAZE OVISLARSUM SKY VISIBLEBOX
ASSIST DCEPC11I GSCANDY MAKETREE PAAAARTY SKYLINE2 VISION
ATMS DCEPC12G GSHOP MAR01 PAGAIN SK_001 VLATTICE
ATOMS DCEPC13D GSS1 MARBLES PAIRSUM SMALL VMILI
AVCHESS DCEPC14A GSS2 MARIOGAM PALACE SMILEY1807 VOCV
A_W_S_N DCEPC14F GSS3 MARTIAN PALDR SNGINT VONNY
BABY DCEPC206 GSS4 MATCH PALIN SNGMSG VOTAS
BACKTPOL DCEPC501 GSS5 MATCHING PALMKR SOCIALNE VPALIN
BACKUP DCEPC505 GSS6 MATGAME PARADOX SOCNETC VPL2_BE
BAD DCEPC706 GSS7 MATHLOVE PARKET1 SOLDIER WACHOVIA
BADXOR DCEPC810 GSS8 MATRIX PARSUMS SOLDIERS WALKROBO
BAISED DCEPCA03 GSWORDS MATSUM PARTPLNE SOLIT WATER
BALLOON DCEPCA06 GUANGGUN MAXLN PARTY SOLVEIT WEIRDFN
BALLOT DCEPCA09 HACKING MAXMATCH PATHEADS SOPARADE WIJGT
BALLSUM DCOWS HACKRNDM MAXSUMSQ PATHGAME SORTBIT WILLITST
BALNUM DECOY HALLOW MAXWOODS PATULJCI SORTOUT WINDVANE
BANDW DEFKIN HAMSTER1 MAXXOR PBOARD SPCU WORDEQ
BAPPP DETER3 HANGOVER MAY99_3 PEBBMOV SPIKES WORDS1
BAT1 DICT HAP01 MB1 PERFUME SPIRALGR WOWSUBSTR2
BAT2 DIEHARD HAPPYTL MBINGO PERIOD SPOINTS WPC4F
BAT3 DIFERENC HAROWS MBIPALIN PERIODNI SPP WPC5E
BC DIGITROOT HASHIT MBLAST PERMUT1 SPRING WPC5G
BDOI16A DIGOKEYS HAYBALE MBRACKET PERMUT2 SQDANCE WPC5I
BDOI16B DISJPATH HC MC PFDEP SQFREE WPUZZLES
BDOI16E DISQUERY HC12 MCAMP PGCD SQRBR WRONG
BEADS DISTANCE HEADSHOT MCARDS PHIDIAS SSHUFFLE WSCIPHER
BEENUMS DISUBSTR HELPR2D2 MCHAOS PHONELST SSORT WTK
BEHAPPY DIV HERDING MCIRGAME PHRASES STABLEMP XMAX
BENEFACT DIV15 HG MCOINS PIBO STAMPS XMEN
BFIT DIV2 HIGH MCQUERY PIE STARSBC XXXXXXXX
BGSHOOT DIVCNT1 HIGHWAYS MDIGITS PIGBANK STC02 XYI
BIGSEQ DIVCNT2 HIPPO MDIGITS1 PIHU1 STEAD YAPP
BILLIARD DIVCNT3 HIST2 MDOLLS PIR STONE2 YODANESS
BINDEC DIVCNTK HISTOGRA METEORS PIZZALOC STPAR YOSEQ
BINGO DIVFACT HKNAP MFISH PKPLOL STRANG ZAMENA
BINPRNUM DIVFACT3 HLP_RAMS MGLAR10 PL STRAWB ZNANSTVE
BINSTIRL DIVREL HMBY MICEMAZE PLAYGAME STREET ZQUERY
BISHOPS DIVSEQ HOLI MILPATR PLD STRLCP ZSEQ
BITDIFF DIVSTR HOMEW MINMOVE PLNDROME STRMATCH ZSUM
BITMAP DIVSUM2 HONDA MINNUM PLNDTREE SUBLEX ZUMA

TODO list of classical problems:

AAC2 BOPERISH DISCRT IITWPC4D MINUS QUADAREA TAP2013E
ACANVAS BOWLING1 DIVISER9 IITWPC4F MINVEST RAIN1 TAP2013J
ACMAKER BOX DIVISION IITWPC4H MMAHWIRE RANGZER2 TAP2014H
ACPC10G BOYSCOUT DNALAB IITWPC4I MMINMAX REC TAP2015A
ADACITY BSPRIME DOMINOES ILKQUERY2 MOBILE2 RESIST TAP2015F
ADACROW BST DYZIO INCDSEQ MOLE RESTACK TAP2015K
ADAFENCE BUZZ EASYFACT INTERVA2 MOWS REVFIB TAP2016B
ADAGROW CAKE2 EC INVESORT MOZPWS RGBRED TAP2016D
ADAHACK CANDN EC_DIVS IRECSQRT MROADS RNG TAP2016H
ADALEMON CARRHIM EDDIST JAN MSE08H ROADTRIP TEMPERAT
ADAPICK CEOI09TR EIDSALAMI2 JOCTENIS NAJKRACI RP TETRAHRD
ADASALES CERC07B EQ2 JOLLYKINGDOM NARHIL RTREE THECODE
ADV04F1 CFPARTY EQBOX JPIX NCOPRIME SAMBOX THRSUM
AE2B CHAIR EQDIV JUICE NEO2 SAMER08E TOP10
AEROLITE CHEATING FACT2 KEQ NFURY SANVI TREASURY
ALCATRAZ3 CHMAZE FACTMODP KOPC12H NINJA7 SCELL TRENDGCD
AMR10D CIRCLEDIV FCTRL4 KPGRAPHS NITT4 SELECTION TREX
AMR10I CIRCLE_H FERT21_0 KPRIMES2 NNUM SEQN TRIBE2
AMR11H CLEVER FIBPOL KPURSUIT NOVICE63 SEQPAR TRIP
ANARC07J CLOCKS FINDLR KRECT NPC2014B SHAMAN TSUNAMI
AND CLOSEST FLING1 LCS0 NPC2015B SID UFPR14D
ANGRMTST CMPANS FRACTION LEGO NUM03 SKYLINE UNICA
ARITH CODESPTI FRSKT LIFEGAME NUMGAME SLIKAR UNTITLE1
ARTHEVAL COMCB FTOUR LOPOV NUMTRY SMALLM UNTITLED
ASHMHF CONNECT GANNHAT MAIN12B ONBRIDGE SNAKYNUM VECTAR11
ASISTENT CONTEST GASWARS MAIN74 ONORIVER1 SORTMAC VFRIEND2
AVLVKT COVER2 GCDEASY MAIN8_E PARITY SPCO VIENTIAN
BABTWR COWPIC GCJ08C MAP PARTIT SPHIWAY VOL
BACKPACK CRAYON GCPC11H MAR02 PBCGAME SPQUEUE WEIGHT
BDOI16D CS GOODA MARYBMW PCPC12H SQRMINSUM WIRELESS
BEMINE CYCLERUN GORELIAN MATNUM PCPC12I SQRROOT WORDCNT2
BIA CYLINDER GUESSNM2 MAUMAU PERMPATT STJEPAN WORDRING
BLAMOEBA CYLINDES HABLU MAXOR PIB STONE XC
BLLUCK DCEPC14H HARSHAD MEANARR POWERUP STORE YOUWIN
BLOCK_D DCEPC702 HELPBOB MEDIAN3 POWPOW STRSEQ
BLOPER DEADFR HIKE MELE3 PRIMES2 SUBSHARD
BLUNIQ DEPEND HUSGAME MEXICAN PROFILING SUDOKU
BNMT DICTSUB HXH MINDIST PT07D TABLE
BOI7FEN DINGRP ICPCS MINIMAX PTRI TAHSINREC
BOMB2 DINOSM IITKWPCM MINSEQ PUTNIK TAP2012G