Yunchang Guan

@guanyu

Afghanistan, Afghanistan

Joined Jul 2017

World Rank: #19 (412.9 points)

Institution: Institution

Activity over the last year

Effectiveness

 Problems solved
1346
 Solutions submitted
71983

Problems

List of solved classical problems:

ABA12C BLINNET DNALAB HOTELS MKJUMPS POSTERS SUBXOR
ABA12D BLKEK DOMINO8 HPYNOS MKPAIRS POTHOLE SUB_PROB
ABA12E BLMIRANA DONALDO HRSIAM MKTHNUM POUR1 SUFEQPRE
ABCD BLMIRINA DOORSPEN HS08PAUL MKUHAR POWERCAR SUMFOUR
ABCDEF BLOCKS DOTAA HS10SQFT MLASERP POWERUP SUMITR
ABCPATH BOI7SEQ DP HUBULLU MLK POWPOW SUMMATION
ABSP1 BOI7SOU DQUERY IAPCR2D MMASS POWPOW2 SUMMUL
ABSURD BOKAM143SOU DRACULA IAPCR2F MMATRIX PPATH SUMSUM
ABSYS BOMARBLE DRAGKING IBIGAME MMAXPER PQUEUE SUMSUMS
ACMAKER BOMBER DRINK ICANDIES MMINPAID PR003004 SUPPER
ACMT BOOKS1 DRTREE IE1 MMMGAME PRADIPSUM SWAPS
ACODE BOOKWORM DRUIDEOI IE2 MOBIVINA PRATA SWTHIN
ACPC10A BORING DSUBSEQ IE4 MOD PRETILE SYNC13C
ACPC10B BORW DTPOLY IEEEBGAM MOHIB PRHYME TAKIN
ACPC10D BOTTOM DUKKAR IGAME MON2012 PRIME TANKS
ACPC10E BOXES DWARFLOG IGOR MONKK PRIME1 TAP2012A
ACPC11B BOYSCOUT DYNACON1 IITD4 MONO PRIMEZUK TAP2012B
ACPC13 BPM DYNACON2 IITKWPCA MONODIG PRIMIT TAP2012C
ACQUIRE BRCKTS DYNALCA IITKWPCD MORSE PRINT TAP2012D
ACTIV BRDGHRD DYZIO IITKWPCE MOZHCAN PRMFN TAP2012E
ADAAPHID BREAK EAGLE1 IITKWPCG MOZHSLM PRMQUER TAP2012F
ADAAPPLE BRIDGE EASYMATH IITKWPCH MOZHSLS PRO TAP2012H
ADABANKET BRKSTRNG EASYPROB IITKWPCI MPILOT PROBLEM4 TAP2013E
ADABERRY BROKEN EC_CONB IITKWPCJ MPOINT PROFIT TAP2013G
ADABLOOM BRPAR EC_ESTA IITKWPCN MROADS PROOT TAP2013H
ADABRANC BSHEEP EC_MODE ILKQUERY MSCHED PRUBALL TAP2013I
ADACABAA BTCODE_A EC_P ILKQUERYIII MSE06H PSTR TAP2014B
ADACAROT BTCODE_G EDIST IM MSE06I PSTRING TAP2014C
ADACHERY BUBBLESORT EDIT IMPER MSE07E PSWITCH TAP2014E
ADACITY BUD13TLF EGYPIZZA INCARDS MSKYCODE PSYCHON TAP2014F
ADACLEAN BUGLIFE EIGHTS INCDSEQ MSTICK PSYCHOT TAP2014G
ADACOINS BURGLARY EIUASSEMBLY INCSEQ MSTRMND PT07C TAP2014I
ADACON BUSINESS EKO INDIPROG MSTS PT07D TAP2014J
ADACROP BUSYMAN ELCS INGRED MSUBSTR PT07F TAP2015B
ADACUT BUZZW ELEVTRBL INS14A MTOTALF PT07J TAP2015C
ADACYCLE BWIDOW EMOTICON INS14C MTREE PT07X TAP2015D
ADADIG BWORK EMTY2 INS14F MTREECOL PT07Y TAP2015H
ADADUNG BYECAKES ENIGMATH INS14G MTRIAREA PT07Z TAP2015I
ADAFIELD BYTESE1 EOPERA INS14H MUDDY PTIME TAP2015J
ADAFIMBR BYTESE2 EPALIN INTEGER1 MUL PUCMM223 TAP2016C
ADAFRIEN BYTESM2 EQU2 INTERVAL MUL2COM PUCMM334 TAP2016F
ADAFTBLL C1LJUTNJ EQUI INTSUB MULSORT PWRANDMOD TAP2016G
ADAFUROW CABLETV ESCJAILA INUMBER MULTII PYRA TAP2016H
ADAGAME CADYDIST ESJAIL INVCNT MULTQ3 QCJ3 TAP2016J
ADAGAME2 CAM5 ETF INVDIV MUSKET QCJ4 TAP2016L
ADAGAME4 CANDY ETFD INVPHI MYQ10 QMAX3VN TAXI
ADAGCD CANDY3 ETFS IOIPALIN NABILHACKER QN01 TAXI2
ADAGRAFT CANTON EVENFRQ IOPC1207 NABILISU QTDIVIDE TBATTLE
ADAHW CAPCITY EXPEDI IPL1 NACCI QTREE TBGAME
ADAINDEX CARDSHUF EXPOR ISAB NAJGC QTREE2 TDKPRIME
ADAJOBS CARINA FACEFRND IWGBS NAJPF QTREE4 TDPRIMES
ADAKOHL CASHIER FACENEMY JARJAR NAJPWG QTREE5 TEAM2
ADALICI CATER FACT0 JAVAC NAKANJ QTREE6 TEMPLEQ
ADALIST CATINV FACT1 JGTLE NANO QTREE7 TESSER
ADAM1 CATM FACTCG2 JNEXT NAPTIME QUADAREA TEST
ADAMATCH CATTACK FACTMUL JOCHEF NASPRIM QUE2 TETRA
ADAMOLD CBANK FACTMULN JOKER1 NATALIAG QUEEN TETRAHRD
ADANUM CCHESS FACVSPOW JOSWAP NDIV QUERYSTR TETRIS3D
ADAORANG CDC12_H FAILURE JULKA NDIVPHI QUEST4 TFOSS
ADAPATH CDOWN FAKETSP JZPCIR NDIVPHI2 QUEST5 TFRIENDS
ADAPET CDRSANJ FALTAENV JZPEXT NDS QUILT THECODE
ADAPHOTO CEPC08B FANCY JZPGYZ NDT R6PL THRBL
ADAPLANT CEQU FARIDA JZPLIT NECKLACE RACETIME THREECOL
ADAPOWER CERC07C FASHION KALTSUM NEG2 RANDMOD THREENUMBERS
ADAQUEUE CERC07K FASTFLOW KAOS NETADMIN RANGESUM THRSUM
ADARAIN CERC07S FAVDICE KATHTHI NEXTLEX RANJAN02 TIP1
ADASALE CF25E FBTOURS KFSTB NFACTOR RAONE TIPTOP
ADASALES CGBOY FCANDY KGSS NFURY RATING TLE
ADASEQEN CHAIN FCDC KITROB NG0FRCTN RCB TMSUM
ADASTRNG CHASE FCTRL KMEDIAL NGCD REAYZCODETST TOANDFRO
ADASUM CHASE1 FCTRL2 KNIGHTS NGIRL RECTANGL TOE1
ADATEAMS CHICAGO FEAST KNMOVE NGM REDARR2 TOE2
ADATREE CHMAZE FENCE1 KOICOST NGM2 RENT TOHMOVE2
ADATRIP CHOCOLA FIBHARD KOILINE NHAY REPEATS TOHU
ADAUNIQ CHUNK2 FIBOSQRT KOIREP NICEBTRE RIOI_2_3 TORNJEVI
ADAUSORT CIJEVI FIBOSUM KOMPICI NICEDAY RIOI_3_2 TOSCORE
ADAVISIT CIRCLE_E FIBTWIST KOPC12A NICESEQ RKS TOUR
ADDREV CIRU FILRTEST KOPC12G NINJA2 RMID TOURIST
ADFRUITS CIRUT FINDPRM KOPC12H NINJA3 RMID2 TOURS
ADRABR CISTFILL FINDSR KOSARE NINJA5 ROADS TPGA
ADVEDIST CITY2 FINFRAC KOZE NITK06 ROCK TRAFFICN
AE00 CLEANRBT FISHER KPGAME NITT1 ROCKETS TRANCLS
AE2A CLFLARR FISHNET KPMATRIX NITT8 ROHAAN TRANSP
AFS CLONE FLIB KPMAZE NITTROAD ROOBOT TRANSP2
AGGRCOW CLOPPAIR FLOWERS KPOWERSUM NKDIV ROOTCIPH TREECST
AGPC01G CLOSEST FN16ASGN KPRIMESB NOCHANGE RPAR TREEDEGREE
AHOCUR CLSLDR FN16CEIL KPSUM NORMA2 RPLA TREEISO
AIBOHP CLZSTRNG FONTSIZE KQUERY NOSQ RPLB TREEORD
AKBAR CMEXPR FOODIES KQUERY2 NOTATRI RPLC TREEPAL
AKVQLD03 CMG FOXLINGS KQUERYO NOVICE43 RPLD TREESUM
ALCATRAZ2 CMPLS FPLAN KSMALL NOVICE63 RPLL TRGRID
ALICESIE CNTDO FPOLICE KTH_INDEX NPC2014A RPLN TRIBE2
ALIEN CNTINDX FRACTION KULE NPC2014F RRANGE TRICENTR
ALIENS CNTINDX2 FREQ2 KURUK14 NPC2015A RRSCHED TRICOUNT
ALL CNTPRIME FREQUENT LABYR1 NPC2015D RSHIFT TRIGALGE
ALLIN1 COCONUTS FRND LARMY NPC2015F RTREE TRIKA
ALLIZWEL CODECODE FRNDCIRC LAS NPC2016A SABBIRGAME TRIP
ALONE CODEIT03 FRNDZND LASER_BEAM NPC2016C SALMAN TRIPINV
ALTSEQ CODEM4 FRQPRIME LASTDIG NPC2016E SAM TRNGL
ALWFACT CODERE3 FTOUR2 LASTDIG2 NQUEEN SAMER08A TROOPS
AMBIG CODESPTB FUNFACT LASTSHOT NSQUARE SAMER08C TRT
AMBLE CODFURY FUNPROB LAZYPROG NSTEPS SAMER08D TRVCOST
AMBM COINS FURYROAD LCA NSUBSTR SAMER08F TRYCOMP
AMR10C COLONY GAME2 LCMSUM NSUBSTR2 SAMER08G TSHOW1
AMR10G COMDIV GAME3 LCPC11B NSYSTEM SAMTWARR TSUM
AMR11A COMPANYS GAMES LCPC12F NTG SAS001 TTM
AMR11B CONDUIT GARDENAR LCS NTHPRIME SBANK TTTABLE
AMR11D CONSEC GCD2 LCS0 NTICKETS SBETS TULIPNUM
AMR11E CORNET GCDEX LCS2 NUMOFPAL SBO TUTMRBL
AMR11J COT GCDEX2 LCS3 NUMPATH SCALES TWENDS
AMR12D COT2 GCDMAT LDP NUMTSN SCAVHUNT TWENTYQ
AMR12I COT3 GCDS LEXSTR NWERC04H SCITIES TWINSNOW
AMZRCK COT4 GCJ082A LFM NWERC11F SCPC11B TWIST
AMZSEQ COUNT GCJ101BB LGLOVE NWERC11H SCPC11H TWOGAME
ANARC05B COUNT1IT GCJ101C LIGHTIN NY10A SCRAPER TWOKINGS
ANARC05H COURAGE GCJ1C09A LIM NY10E SCUBADIV TWOPATHS
ANARC05I COURIER GCJ1C09C LINEGAR ODDDIV SEGMENTS TWOPROF
ANARC07C COVER GCPC11B LINES OEN SEGSQRSS TWOSQRS
ANARC07G COWCAR GCPC11I LINEUP OFFSIDE SELLPHN2 UCBINTG
ANARC08A CPAIR GCPC11J LIS2 OIL SELTEAM UCI2009D
ANARC08B CPAIR2 GDCOFTI LISA OILCOMP SEQ UCODES
ANARC08F CPATTERN GEEKOUNT LITE OKRET SEQ2 UCV2013A
ANARC08G CPCRC1C GEN LITEPIPE OLOLO SERGEARS UCV2013B
ANARC08H CPRIME GEOM LKS ONEZERO SERGRID UCV2013E
ANARC09A CPRMT GEOPROB LMCONSTR ONP SERVICE UCV2013H
ANARC09B CRAN02 GERGOVIA LOCKER OPCPIZZA SFN UCV2013I
ANARC09F CRAN04 GGD LONGCS OPMODULO SGAME UCV2013J
ANDROUND CRAZYSK GHOSTS LOOPEXP OPTM SGIFT UJ
ANGELS CRDS GIRLSNBS LOSTNSURVIVED ORDERS SHAHBG UJ01
ANTP CROSSOVER GIVEAWAY LOTGAME ORDERSET SHAKILKEYWORD ULM02
ANTTT CRSCNTRY GLJIVE LOVEGURU ORDSUM23 SHAKTI ULM09
AP2 CRYPTON GMSTRE LPIS ORGNZ SHELF UNICA
APIO10A CRZYSMKR GNY07D LQDCANDY OTOCI SHINCARD UOFTAE
APIO14_A CSTREET GNY07F LTRAFFIC OVGDEL SHOP UPDATEIT
APM CSUBSEQS GNY07H LUCIFER OVISLARSUM SHOP2 VBOSS
APS CTGAME GNYR09F LUCKYNUM PAAAARTY SHPATH VCIRCLES
APS2 CTRICK GOALFR LVADER PAGAIN SHUB1307 VECTAR1
ARBITRAG CTTC GOC11A M00PAIR PAIRSUM SICRANO VECTAR10
ARCTAN CUBEFR GOC11B M3TILE PALACE SITB VECTAR5
ARDA1 CUBNUM GONDOR MAIN111 PALDR SKY VECTAR8
AREA1 CUTSQRS GONE MAIN112 PALIN SKYLINE2 VENOM
ARITH2 CVJETICI GOO MAIN72 PALMKR SK_001 VFMUL
ARMY CVXPOLY GOODA MAIN74 PARADOX SMALL VHUFFM
AROPE CWORLD GOODB MAIN75 PARKET1 SMILEY1807 VILLAGES
AROPE3 CZ_PROB1 GOODG MAIN8_C PARSUMS SNGINT VISIBLEBOX
ARRAYSUB DAGCNT2 GOT MAKEMAZE PARTIT SNGMSG VISION
ASCDFIB DANGER GPA1 MAKETREE PARTPLNE SNGPG VLATTICE
ASSIGN DAVIDG GRAFFDEF MARBLES PARTY SOCIALNE VMILI
ASSIST DBALLZ GRASSPLA MARIOGAM PATHEADS SOCNETC VOCV
ATMS DCEPC11B GRE MARTIAN PATHGAME SOLDIER VONNY
ATOMS DCEPC11I GREED MARYBMW PATULJCI SOLDIERS VOTAS
AVCHESS DCEPC12E GRZZ MATCH PBOARD SOLIT VPALIN
A_W_S_N DCEPC12G GSCANDY MATCHING PCPC12E SOLVEIT VPL2_BE
BABTWR DCEPC13D GSHOP MATGAME PCPC12F SOPARADE WACHOVIA
BABY DCEPC14A GSS1 MATHLOVE PERFUME SORTBIT WALKROBO
BACKPACK DCEPC14F GSS2 MATSUM PERIOD SORTOUT WATER
BACKTPOL DCEPC206 GSS3 MAXLN PERIODNI SPA WEIRDFN
BACKUP DCEPC501 GSS4 MAXMATCH PERMUT1 SPCO WIJGT
BAD DCEPC505 GSS5 MAXSUMSQ PERMUT2 SPCU WILLITST
BADXOR DCEPC705 GSS6 MAXWOODS PETYABRO SPIKES WINDVANE
BAISED DCEPC706 GSS7 MAXXOR PFDEP SPIRALGR WIRELESS
BALIFE DCEPC810 GSS8 MAX_NUM PGCD SPOINTS WORDEQ
BALLOON DCEPCA03 GSWORDS MAY99_3 PHIDIAS SPP WORDRING
BALLOT DCEPCA06 GUANGGUN MB1 PHONELST SPRING WORDS1
BALLSUM DCEPCA09 HABLU MBINGO PHRASES SQDANCE WOWSUBSTR2
BALNUM DCOWS HACKING MBIPALIN PHU09K SQFREE WPC4F
BANDW DECOY HACKRNDM MBRACKET PIBO SQRBR WPC5E
BAPPP DEFKIN HALLOW MC PIE SRTMACH WPC5G
BAT1 DEPEND HAMSTER1 MCAMP PIGBANK SSHUFFLE WPC5I
BAT2 DETER3 HANGOVER MCHAOS PIHU1 SSORT WPUZZLES
BAT3 DICT HAP01 MCIRGAME PIR STABLEMP WRONG
BC DIEHARD HAPPYTL MCOINS PISANO STAMPS WSCIPHER
BDOI16A DIFERENC HAROWS MCQUERY PIZZALOC STARSBC WTK
BDOI16B DIGITROOT HASHIT MDIGITS PKPLOL STC02 XMAX
BDOI16E DIGOKEYS HAYBALE MDIGITS1 PL STC10 XMEN
BEADS DISCRT HC MDOLLS PLAYGAME STEAD XORX
BEENUMS DISJPATH HC12 MDST PLD STONE XXXXXXXX
BEHAPPY DISQUERY HEADSHOT MEANARR PLNDROME STONE2 XYI
BENEFACT DISTANCE HELPR2D2 METEORS PLNDTREE STPAR YAPP
BFIT DISUBSTR HERDING MFISH PLSQUARE STRANG YODANESS
BGSHOOT DIV HG MGLAR10 PMATRIX STRAWB YOSEQ
BIGSEQ DIV15 HIGH MHLAR10 POCRI STREDUCE YOUTUBE
BILLIARD DIV2 HIGHWAYS MICEMAZE POKER STREET ZAMENA
BINGO DIVCNT1 HIPPO MILPATR POLEVAL STRLCP ZNANSTVE
BINPRNUM DIVCNT2 HIST2 MINDIFF POLICEMEN STRMATCH ZQUERY
BINSTIRL DIVCNT3 HISTOGRA MINMOVE POLQUERY SUBLEX ZSEQ
BISHOPS DIVCNTK HKNAP MINNUM POLYEQ SUBMERGE ZSUM
BITDIFF DIVFACT HLP_RAMS MINSTACK POLYMUL SUBS ZUMA
BITMAP DIVFACT3 HMBY MINSTOCK POLYNOM SUBSEQ
BITPLAY DIVREL HOLI MINSUB PON SUBSET
BLACKOUT DIVSEQ HOMEW MISERMAN POP1 SUBSN
BLBONO DIVSTR HONDA MIXTURES POP2 SUBST1
BLCONE DIVSUM2 HORRIBLE MKEQUAL POSTERIN SUBSUMS

TODO list of classical problems:

AAC2 BOPERISH DCEPC807 ICPCS MENU PRIMES2 SUDOKU
ACANVAS BOWLING1 DEADFR IITKWPCC MEXICAN PROFILING SUMPRO
ACPC10C BOX DICTSUB IITKWPCM MINDIST PTRI TABLE
ACPC10G BSPRIME DINGRP IITWPC4D MINIMAX PUCMM210 TAHSINREC
ADACROW BST DINOSM IITWPC4F MINSEQ PUTNIK TAP2012G
ADAFENCE BUZZ DIVISER9 IITWPC4H MINUS QTGIFT1 TAP2013J
ADAGAME5 BVAAN DIVISION IITWPC4I MINVEST RAIN1 TAP2014H
ADAGROW CAC DOMINOES ILKQUERY2 MLAND RANGZER2 TAP2015A
ADAHACK CAKE2 DSUBMTR ILOVEGEO MMAHWIRE REC TAP2015F
ADALEMON CAKE3 EASYFACT IMPORT MMINMAX RELINETS TAP2015G
ADAPICK CANDN EC INCPOWK MMOD29 RESIST TAP2015K
ADAZOO CANPR EC_DIVS INTERVA2 MOBILE2 RESTACK TAP2016B
ADV04F1 CARRHIM EDDIST INVESORT MODSEQ REVFIB TAP2016D
AE2B CCOST EIDSALAMI2 IRECSQRT MOLE RGBRED TAP2016E
AEROLITE CEOI09TR EMTY3 JAN MONONUM RNG TAP2016I
ALCATRAZ3 CERC07B EQ2 JC15A MOON1 ROADTRIP TAP2016K
AMR10A CERC07L EQBOX JMFILTER MOWGLI ROBBERY2 TEMPERAT
AMR10D CFPARTY EQDIV JOCTENIS MOWS ROBOTGRI THEWAR
AMR10I CHAIR FACT2 JOLLYKINGDOM MOZPWS RP TOP10
AMR11H CHEATING FACTMODP JPIX MPOLEVAL RTREE3 TOUGH
AMR12A CIRCLEDIV FAST2 JUICE NAJ0001 RUNAWAY TREASURY
ANARC07J CIRCLE_H FCTRL4 JUSTAPAL NAJKRACI SAMBOX TRENDGCD
ANARC08I CLCKBAIT FERT21_0 JZPSTA NARHIL SAMER08E TREX
ANARC09G CLEVER FIBPOL KDOMINO NCOPRIME SANVI TRSTAGE
AND CLOCKS FINDLR KEQ NEO2 SAS002 TSUNAMI
ANGRMTST CMPANS FLING1 KMSL4B NINJA7 SCELL TUG
ARITH CNURI18H FNRANK KONSTRAKSCHION NITT4 SELECTION UCBINTC
ARTHEVAL CODESPTI FROGPARTY KPGRAPHS NNUM SEQN UFPR14D
ASHMHF CODING2 FRSKT KPRIMES2 NPC2014B SEQPAR UNTITLE1
ASISTENT COLORSEG FTOUR KPURSUIT NPC2015B SHAMAN UNTITLED
AU7_5 COMCB GANNHAT KRECT NUMGAME SID URJC2_F
AVLVKT CONNECT GASWARS LEGO NUMTRY SKEY VECTAR11
BAC CONTEST GCDEASY LIFEGAME NWERC11J SKYLINE VFRIEND2
BDOI16D COUNTDIO GCJ08C LITELANG ONBRIDGE SLIKAR VGCD
BEMINE COVER2 GCJ2012C LOPOV ONORIVER1 SMALLM VIENTIAN
BIA COWPIC GCPC11A LUDIC1 OVICUMSUM SNAKYNUM VOL
BIT2 CRAYON GCPC11H MAIN113 PARITY SORTMAC VZLA2019G
BLAMOEBA CRYPTO2 GONESORT MAIN12B PARTPALI SPHIWAY WEIGHT
BLLUCK CS GORELIAN MAIN8_E PBCGAME SQRMINSUM WORDCNT2
BLOCK_D CS345A1 GUESSNM2 MAP PCPC12H SQRROOT XC
BLOPER CSQUARE HARSHAD MATNUM PCPC12I STACK YOUWIN
BLUNIQ CYCLERUN HELPBOB MAUMAU PERMPATT STJEPAN ZEBRA
BNMT CYLINDER HIKE MAXOR PIB STORE ZIGZAG2
BOI7FEN CYLINDES HS09EQ MCUR98 PODUZECE STRCOUNT
BOMB2 DCEPC14H HUSGAME MEDIAN3 POWTOW STRSEQ
BOOKCASE DCEPC702 HXH MELE3 PPR SUBSHARD