Yunchang Guan

@guanyu

Afghanistan, Afghanistan

Joined Jul 2017

World Rank: #19 (393.4 points)

Institution: Institution

Activity over the last year

Effectiveness

 Problems solved
1248
 Solutions submitted
53434

Problems

List of solved classical problems:

ABA12C BLACKOUT DP HRSIAM MKJUMPS POSTERIN SUB_PROB
ABA12D BLBONO DQUERY HS08PAUL MKTHNUM POSTERS SUMFOUR
ABA12E BLCONE DRACULA HS10SQFT MLASERP POTHOLE SUMITR
ABCD BLINNET DRAGKING HUBULLU MLK POUR1 SUMMATION
ABCDEF BLMIRANA DRINK IAPCR2D MMASS POWERCAR SUMMUL
ABCPATH BLMIRINA DRTREE IAPCR2F MMATRIX POWPOW2 SUMSUM
ABSP1 BOI7SEQ DRUIDEOI IBIGAME MMAXPER PPATH SUMSUMS
ABSURD BOI7SOU DSUBSEQ ICANDIES MMINPAID PQUEUE SUPPER
ABSYS BOKAM143SOU DUKKAR IE1 MMMGAME PR003004 SWAPS
ACMT BOMBER DWARFLOG IE2 MOBIVINA PRADIPSUM SYNC13C
ACODE BOOKS1 DYNACON1 IE4 MOD PRATA TAKIN
ACPC10A BOOKWORM DYNACON2 IEEEBGAM MOHIB PRETILE TANKS
ACPC10B BORING DYNALCA IGAME MON2012 PRHYME TAP2012A
ACPC10D BORW EAGLE1 IGOR MONKK PRIME TAP2012B
ACPC10E BOTTOM EASYMATH IITKWPCA MONO PRIME1 TAP2012C
ACPC11B BOXES EASYPROB IITKWPCE MONODIG PRINT TAP2012D
ACQUIRE BPM EC_CONB IITKWPCG MORSE PRMFN TAP2012E
ACTIV BRCKTS EC_MODE IITKWPCH MOZHCAN PRMQUER TAP2012F
ADAAPPLE BRDGHRD EC_P IITKWPCI MOZHSLM PRO TAP2012H
ADABANKET BRIDGE EDIST IITKWPCJ MOZHSLS PROBLEM4 TAP2013G
ADABERRY BRKSTRNG EDIT IITKWPCN MPILOT PROFIT TAP2013H
ADABLOOM BROKEN EGYPIZZA ILKQUERY MPOINT PROOT TAP2013I
ADABRANC BSHEEP EIGHTS ILKQUERYIII MREPLBRC PRUBALL TAP2014B
ADACABAA BTCODE_G EIUASSEMBLY IM MSCHED PSTR TAP2014C
ADACAROT BUBBLESORT EKO IMPER MSE06H PSTRING TAP2014E
ADACHERY BUD13TLF ELEVTRBL INCARDS MSE06I PSWITCH TAP2014F
ADACITY BUGLIFE EMOTICON INCSEQ MSE07E PSYCHON TAP2014G
ADACLEAN BUSINESS EMTY2 INDIPROG MSKYCODE PSYCHOT TAP2014I
ADACOINS BUSYMAN ENIGMATH INGRED MSTRMND PT07C TAP2014J
ADACON BUZZW EOPERA INS14A MSTS PT07D TAP2015B
ADACROP BWORK EPALIN INS14C MSUBSTR PT07F TAP2015C
ADACUT BYECAKES EQU2 INS14F MTOTALF PT07J TAP2015D
ADACYCLE BYTESE1 EQUI INS14G MTREE PT07X TAP2015H
ADADIG BYTESE2 ESCJAILA INS14H MTREECOL PT07Y TAP2015I
ADADUNG BYTESM2 ESJAIL INTEGER1 MTRIAREA PT07Z TAP2015J
ADAFIELD C1LJUTNJ ETF INTERVAL MUDDY PTIME TAP2016C
ADAFIMBR CADYDIST ETFD INTSUB MUL PUCMM223 TAP2016F
ADAFRIEN CAM5 ETFS INUMBER MUL2COM PUCMM334 TAP2016G
ADAFTBLL CANDY EVENFRQ INVCNT MULSORT PWRANDMOD TAP2016H
ADAFUROW CANDY3 EXPEDI INVDIV MULTII PYRA TAP2016J
ADAGAME CANTON EXPOR INVPHI MULTQ3 QCJ3 TAP2016L
ADAGCD CAPCITY FACEFRND IOIPALIN MUSKET QCJ4 TAXI
ADAGRAFT CARDSHUF FACENEMY IOPC1207 MYQ10 QMAX3VN TAXI2
ADAHW CARINA FACT0 IPL1 NABILHACKER QN01 TBATTLE
ADAINDEX CASHIER FACT1 ISAB NABILISU QTDIVIDE TBGAME
ADAJOBS CATINV FACTCG2 JARJAR NACCI QTREE TDKPRIME
ADAKOHL CATM FACTMUL JAVAC NAJGC QTREE2 TDPRIMES
ADALICI CATTACK FACTMULN JEDNAKOS NAJPF QTREE4 TEAM2
ADALIST CBANK FACVSPOW JGTLE NAJPWG QTREE5 TEMPLEQ
ADAMATCH CCHESS FAILURE JNEXT NAKANJ QTREE6 TESSER
ADAMOLD CDC12_H FAKETSP JOCHEF NANO QTREE7 TEST
ADANUM CDOWN FALTAENV JOKER1 NAPTIME QUE2 TETRA
ADAORANG CDRSANJ FANCY JOSWAP NASPRIM QUEEN TETRIS3D
ADAPATH CEPC08B FARIDA JULKA NATALIAG QUERYSTR TFOSS
ADAPET CEQU FASHION JZPCIR NDIV QUEST4 TFRIENDS
ADAPHOTO CERC07C FASTFLOW JZPEXT NDIVPHI QUILT THECODE
ADAPLANT CERC07K FAVDICE JZPGYZ NDS R6PL THRBL
ADAPOWER CERC07S FBTOURS JZPLIT NDT RACETIME THREECOL
ADAQUEUE CF25E FCANDY KALTSUM NECKLACE RANDMOD THREENUMBERS
ADARAIN CGBOY FCDC KAOS NEG2 RANGESUM THRSUM
ADASALE CHAIN FCTRL KATHTHI NETADMIN RANJAN02 TIP1
ADASEQEN CHASE FCTRL2 KFSTB NEXTLEX RAONE TIPTOP
ADASTRNG CHASE1 FENCE1 KGSS NFACTOR RATING TLE
ADASUM CHICAGO FIBHARD KITROB NG0FRCTN RCB TMSUM
ADATEAMS CHOCOLA FIBOSQRT KMEDIAL NGCD REAYZCODETST TOANDFRO
ADATREE CIJEVI FIBOSUM KNIGHTS NGIRL RECTANGL TOE1
ADATRIP CIRCLE_E FIBTWIST KNMOVE NGM REDARR2 TOE2
ADAUNIQ CIRU FILRTEST KOICOST NGM2 RENT TOHMOVE2
ADAUSORT CIRUT FINDPRM KOIREP NHAY REPEATS TOHU
ADAVISIT CISTFILL FINDSR KOMPICI NICEBTRE RIOI_2_3 TORNJEVI
ADDREV CITY2 FINFRAC KOPC12A NICEDAY RIOI_3_2 TOSCORE
ADFRUITS CLEANRBT FISHER KOSARE NICESEQ RKS TOUR
ADRABR CLFLARR FLIB KOZE NINJA2 RMID TOURIST
ADVEDIST CLOPPAIR FLOWERS KPGAME NINJA3 RMID2 TOURS
AE00 CLSLDR FN16ASGN KPMATRIX NINJA5 ROADS TPCPALIN
AE2A CLZSTRNG FN16CEIL KPMAZE NITK06 ROCK TPGA
AFS CMEXPR FOODIES KPOWERSUM NITT1 ROCKETS TRAFFICN
AGGRCOW CMG FOXLINGS KPRIMESB NITT8 ROHAAN TRANCLS
AGPC01G CMPLS FP KPSUM NITTROAD ROOBOT TRANSP
AHOCUR CNTDO FPLAN KQUERY NKDIV ROOTCIPH TRANSP2
AIBOHP CNTINDX FPOLICE KQUERYO NOCHANGE RPAR TREECST
AKBAR CNTINDX2 FREQ2 KSMALL NORMA2 RPLA TREEDEGREE
AKVQLD03 CNTPRIME FREQUENT KTH_INDEX NOSQ RPLB TREEISO
ALCATRAZ2 COCONUTS FRND KULE NOTATRI RPLC TREEORD
ALICESIE CODECODE FRNDCIRC KURUK14 NOVICE43 RPLL TREEPAL
ALIEN CODEIT03 FRNDZND LABYR1 NOVICE63 RPLN TREESUM
ALIENS CODEM4 FRQPRIME LARMY NPC2014A RRANGE TRICOUNT
ALL CODERE3 FTOUR2 LAS NPC2014F RRSCHED TRIGALGE
ALLIN1 CODESPTB FUNPROB LASER_BEAM NPC2015A RTREE TRIKA
ALLIZWEL CODFURY FURYROAD LASTDIG NPC2015D SABBIRGAME TRIPINV
ALONE COINS GAME2 LASTDIG2 NPC2015F SALMAN TRNGL
ALTSEQ COLONY GAME3 LASTSHOT NPC2016A SAM TROOPS
ALWFACT COMDIV GAMES LAZYPROG NPC2016C SAMER08A TRT
AMBIG COMPANYS GARDENAR LCA NPC2016E SAMER08C TRVCOST
AMBLE CONDUIT GCD2 LCMSUM NQUEEN SAMER08D TRYCOMP
AMBM CONSEC GCDEX LCPC11B NSQUARE SAMER08F TSHOW1
AMR10C CORNET GCDEX2 LCPC12F NSTEPS SAMTWARR TSUM
AMR10G COT GCDS LCS NSUBSTR SAS001 TTM
AMR11A COT2 GCJ082A LCS2 NSUBSTR2 SBANK TTTABLE
AMR11B COT3 GCJ101BB LCS3 NSYSTEM SBETS TULIPNUM
AMR11D COT4 GCJ1C09A LDP NTG SBO TUTMRBL
AMR11E COUNT GCJ1C09C LEXSTR NTHPRIME SCALES TWENDS
AMR11J COUNT1IT GCPC11B LFM NTICKETS SCAVHUNT TWINSNOW
AMR12D COURAGE GCPC11I LGLOVE NUMOFPAL SCITIES TWIST
AMR12I COURIER GCPC11J LIGHTIN NUMPATH SCPC11H TWOGAME
AMZRCK COVER GDCOFTI LIM NUMTSN SCRAPER TWOKINGS
AMZSEQ COWCAR GEEKOUNT LINEGAR NWERC04H SCUBADIV TWOPATHS
ANARC05B CPAIR2 GEN LINES NWERC11F SEGMENTS TWOPROF
ANARC05H CPATTERN GEOM LINEUP NWERC11H SEGSQRSS TWOSQRS
ANARC05I CPCRC1C GEOPROB LIS2 NY10A SELLPHN2 UCBINTG
ANARC07C CPRIME GERGOVIA LISA NY10E SELTEAM UCI2009D
ANARC07G CPRMT GGD LITE ODDDIV SEQ UCODES
ANARC08A CRAN02 GHOSTS LITEPIPE OEN SEQ2 UCV2013B
ANARC08B CRAN04 GIRLSNBS LKS OFFSIDE SERGEARS UCV2013E
ANARC08F CRDS GIVEAWAY LMCONSTR OIL SERGRID UCV2013H
ANARC08G CROSSOVER GLJIVE LOCKER OILCOMP SERVICE UCV2013I
ANARC08H CRSCNTRY GMSTRE LONGCS OLOLO SFN UCV2013J
ANARC09A CRYPTON GNY07D LOOPEXP ONEZERO SGAME UJ
ANARC09B CRZYSMKR GNY07F LOSTNSURVIVED ONP SGIFT UJ01
ANARC09F CSTREET GNY07H LOVEGURU OPCPIZZA SHAHBG ULM02
ANDROUND CSUBSEQS GNYR09F LPIS OPMODULO SHAKILKEYWORD ULM09
ANGELS CTGAME GOALFR LQDCANDY OPTM SHAKTI UOFTAE
ANTP CTRICK GOC11A LTRAFFIC ORDERS SHELF UPDATEIT
ANTTT CTTC GOC11B LUCIFER ORDERSET SHINCARD VBOSS
AP2 CUBEFR GONDOR LUCKYNUM ORDSUM23 SHOP VCIRCLES
APIO10A CUBNUM GONE LVADER ORGNZ SHOP2 VECTAR1
APIO14_A CUTSQRS GOO M00PAIR OTOCI SHPATH VECTAR10
APM CVJETICI GOODB M3TILE OVGDEL SHUB1307 VECTAR5
APS CVXPOLY GOODG MAGSUB1 OVISLARSUM SICRANO VECTAR8
APS2 CWORLD GOT MAIN111 PAAAARTY SKY VENOM
ARBITRAG CZ_PROB1 GPA1 MAIN112 PAGAIN SKYLINE2 VFMUL
ARCTAN DAGCNT2 GRAFFDEF MAIN72 PAIRSUM SK_001 VHUFFM
ARDA1 DANGER GRASSPLA MAIN75 PALACE SMALL VILLAGES
AREA1 DAVIDG GRE MAIN8_C PALDR SMILEY1807 VISIBLEBOX
ARITH2 DBALLZ GREED MAKEMAZE PALIN SNGINT VISION
ARMY DCEPC11B GRZZ MAKETREE PALMKR SNGMSG VLATTICE
ARRAYSUB DCEPC11I GS MARBLES PARADOX SNGPG VMILI
ASCDFIB DCEPC12G GSCANDY MARIOGAM PARKET1 SOCIALNE VOCV
ASSIGN DCEPC13D GSHOP MARTIAN PARSUMS SOCNETC VONNY
ASSIGN4 DCEPC14A GSS1 MATCH PARTPLNE SOLDIER VOTAS
ASSIST DCEPC14F GSS2 MATCHING PARTY SOLDIERS VPALIN
ATMS DCEPC206 GSS3 MATGAME PATHEADS SOLIT VPL2_BE
ATOMS DCEPC501 GSS4 MATHLOVE PATHGAME SOLVEIT WACHOVIA
AVCHESS DCEPC505 GSS5 MATRIX PATULJCI SOPARADE WALKROBO
A_W_S_N DCEPC705 GSS6 MATSUM PBOARD SORTBIT WATER
BABY DCEPC706 GSS7 MAXLN PEBBMOV SORTOUT WEIRDFN
BACKTPOL DCEPC810 GSS8 MAXMATCH PERFUME SPA WIJGT
BACKUP DCEPCA03 GSWORDS MAXSUMSQ PERIOD SPCU WILLITST
BAD DCEPCA06 GUANGGUN MAXWOODS PERIODNI SPIKES WINDVANE
BADXOR DCEPCA09 HACKING MAXXOR PERMUT1 SPIRALGR WIRELESS
BAISED DCOWS HACKRNDM MAY99_3 PERMUT2 SPOINTS WORDEQ
BALLOON DECOY HALLOW MB1 PFDEP SPP WORDS1
BALLOT DEFKIN HAMSTER1 MBINGO PGCD SPRING WOWSUBSTR2
BALLSUM DETER3 HANGOVER MBIPALIN PHIDIAS SQDANCE WPC4F
BALNUM DICT HAP01 MBLAST PHONELST SQFREE WPC5E
BANDW DIEHARD HAPPYTL MBRACKET PHRASES SQRBR WPC5G
BAPPP DIFERENC HAROWS MC PIBO SSHUFFLE WPC5I
BAT1 DIGITROOT HASHIT MCAMP PIE SSORT WPUZZLES
BAT2 DIGOKEYS HAYBALE MCARDS PIGBANK STABLEMP WRONG
BAT3 DISJPATH HC MCHAOS PIHU1 STAMPS WSCIPHER
BC DISQUERY HC12 MCIRGAME PIR STARSBC WTK
BDOI16A DISTANCE HEADSHOT MCOINS PISANO STC02 XMAX
BDOI16B DISUBSTR HELPR2D2 MCQUERY PIZZALOC STEAD XMEN
BDOI16E DIV HERDING MDIGITS PKPLOL STONE2 XXXXXXXX
BEADS DIV15 HG MDIGITS1 PL STPAR XYI
BEENUMS DIV2 HIGH MDOLLS PLAYGAME STRANG YAPP
BEHAPPY DIVCNT1 HIGHWAYS METEORS PLD STRAWB YODANESS
BENEFACT DIVCNT2 HIPPO MFISH PLNDROME STREET YOSEQ
BFIT DIVCNT3 HIST2 MGLAR10 PLNDTREE STRLCP ZAMENA
BGSHOOT DIVCNTK HISTOGRA MICEMAZE PLSQUARE STRMATCH ZNANSTVE
BIGSEQ DIVFACT HKNAP MILPATR PMATRIX SUBLEX ZQUERY
BILLIARD DIVFACT3 HLP_RAMS MINMOVE POKER SUBMERGE ZSEQ
BINGO DIVREL HMBY MINNUM POLEVAL SUBS ZSUM
BINPRNUM DIVSEQ HOLI MINSTACK POLICEMEN SUBSEQ ZUMA
BINSTIRL DIVSTR HOMEW MINSTOCK POLQUERY SUBSET
BISHOPS DIVSUM2 HONDA MINSUB POLYEQ SUBSN
BITDIFF DONALDO HORRIBLE MISERMAN POLYMUL SUBST1
BITMAP DOORSPEN HOTELS MIXTURES POLYNOM SUBSUMS
BITPLAY DOTAA HPYNOS MKEQUAL PON SUBXOR

TODO list of classical problems:

AAC2 BOPERISH DINOSM HXH MELE3 PUTNIK TAHSINREC
ACANVAS BOWLING1 DISCRT ICPCS MEXICAN QUADAREA TAP2012G
ACMAKER BOX DIVISER9 IITKWPCM MINDIST RAIN1 TAP2013E
ACPC10G BOYSCOUT DIVISION IITWPC4D MINIMAX RANGZER2 TAP2013J
ADAAPHID BSPRIME DNALAB IITWPC4F MINSEQ REC TAP2014H
ADACROW BST DOMINOES IITWPC4H MINUS RELINETS TAP2015A
ADAFENCE BUZZ DYZIO IITWPC4I MINVEST RESIST TAP2015F
ADAGROW CAKE2 EASYFACT ILKQUERY2 MMAHWIRE RESTACK TAP2015K
ADAHACK CANDN EC INCDSEQ MMINMAX REVFIB TAP2016B
ADALEMON CARRHIM EC_DIVS INTERVA2 MOBILE2 RGBRED TAP2016D
ADAPICK CEOI09TR EDDIST INVESORT MOLE RNG TAP2016E
ADASALES CERC07B EIDSALAMI2 IRECSQRT MOWS ROADTRIP TAP2016I
ADV04F1 CFPARTY EQ2 JAN MOZPWS RP TAP2016K
AE2B CHAIR EQBOX JOCTENIS MROADS SAMBOX TEMPERAT
AEROLITE CHEATING EQDIV JOLLYKINGDOM MSE08H SAMER08E TETRAHRD
ALCATRAZ3 CHMAZE FACT2 JPIX NAJKRACI SANVI TOP10
AMR10D CIRCLEDIV FACTMODP JUICE NARHIL SAS002 TOUGH
AMR10I CIRCLE_H FCTRL4 JUSTAPAL NCOPRIME SCELL TREASURY
AMR11H CLEVER FERT21_0 KEQ NEO2 SELECTION TRENDGCD
ANARC07J CLOCKS FIBPOL KOPC12H NFURY SEQN TREX
AND CLOSEST FINDLR KPGRAPHS NINJA7 SEQPAR TRIBE2
ANGRMTST CMPANS FLING1 KPRIMES2 NITT4 SHAMAN TRIP
ARITH CODESPTI FRACTION KPURSUIT NNUM SID TSUNAMI
ARTHEVAL COLORSEG FROGPARTY KRECT NPC2014B SKYLINE UFPR14D
ASHMHF COMCB FRSKT LCS0 NPC2015B SLIKAR UNICA
ASISTENT CONNECT FTOUR LEGO NUMGAME SMALLM UNTITLE1
AVLVKT CONTEST GANNHAT LIFEGAME NUMTRY SNAKYNUM UNTITLED
BABTWR COUNTDIO GASWARS LOPOV ONBRIDGE SORTMAC VECTAR11
BACKPACK COVER2 GCDEASY LUDIC1 ONORIVER1 SPCO VFRIEND2
BDOI16D COWPIC GCDMAT MAIN113 PARITY SPHIWAY VIENTIAN
BEMINE CRAYON GCJ08C MAIN12B PARTIT SPQUEUE VOL
BIA CS GCJ2012C MAIN74 PBCGAME SQRMINSUM VZLA2019G
BIT2 CYCLERUN GCPC11H MAIN8_E PCPC12H SQRROOT WEIGHT
BLAMOEBA CYLINDER GOODA MAP PCPC12I STJEPAN WORDCNT2
BLLUCK CYLINDES GORELIAN MARYBMW PERMPATT STONE WORDRING
BLOCK_D DCEPC14H GUESSNM2 MATNUM PIB STORE XC
BLOPER DCEPC702 HABLU MAUMAU POWERUP STRCOUNT YOUWIN
BLUNIQ DEADFR HARSHAD MAXOR POWPOW STRSEQ ZEBRA
BNMT DEPEND HELPBOB MCUR98 PRIMES2 SUBSHARD
BOI7FEN DICTSUB HIKE MEANARR PROFILING SUDOKU
BOMB2 DINGRP HUSGAME MEDIAN3 PTRI TABLE