Yunchang Guan

@guanyu

Afghanistan, Afghanistan

Joined Jul 2017

World Rank: #18 (404.9 points)

Institution: Institution

Activity over the last year

Effectiveness

 Problems solved
1301
 Solutions submitted
63408

Problems

List of solved classical problems:

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

TODO list of classical problems:

AAC2 BOX DEADFR HIKE MAUMAU PODUZECE TABLE
ACANVAS BSPRIME DICTSUB HUSGAME MAXOR PRIMES2 TAHSINREC
ACPC10C BST DINGRP HXH MCUR98 PROFILING TAP2012G
ACPC10G BUZZ DINOSM ICPCS MEANARR PTRI TAP2013E
ADAAPHID BVAAN DISCRT IITKWPCC MEDIAN3 PUTNIK TAP2013J
ADACROW CAKE2 DIVISER9 IITKWPCM MELE3 RAIN1 TAP2014H
ADAFENCE CAKE3 DIVISION IITWPC4D MEXICAN RANGZER2 TAP2015A
ADAGROW CANDN DOMINOES IITWPC4F MINDIST REC TAP2015F
ADAHACK CANPR DSUBMTR IITWPC4H MINIMAX RELINETS TAP2015G
ADALEMON CARRHIM DTPOLY IITWPC4I MINSEQ RESIST TAP2015K
ADAPICK CCOST DYZIO ILKQUERY2 MINUS RESTACK TAP2016B
ADAZOO CEOI09TR EASYFACT ILOVEGEO MINVEST REVFIB TAP2016D
ADV04F1 CERC07B EC IMPORT MMAHWIRE RGBRED TAP2016E
AE2B CERC07L EC_DIVS INCDSEQ MMINMAX RNG TAP2016I
AEROLITE CFPARTY EDDIST INTERVA2 MOBILE2 ROADTRIP TAP2016K
ALCATRAZ3 CHAIR EIDSALAMI2 INVESORT MODSEQ ROBBERY2 TEMPERAT
AMR10A CHEATING EMTY3 IRECSQRT MOLE ROBOTGRI THEWAR
AMR10D CHMAZE EQ2 JAN MONONUM RP TOP10
AMR10I CIRCLEDIV EQBOX JMFILTER MOWS SAMBOX TOUGH
AMR11H CIRCLE_H EQDIV JOCTENIS MOZPWS SAMER08E TREASURY
ANARC07J CLCKBAIT FACT2 JOLLYKINGDOM MPOLEVAL SANVI TRENDGCD
ANARC08I CLEVER FACTMODP JPIX NAJ0001 SAS002 TREX
ANARC09G CLOCKS FAST2 JUICE NAJKRACI SCELL TSUNAMI
AND CLOSEST FCTRL4 JUSTAPAL NARHIL SELECTION TUG
ANGRMTST CMPANS FERT21_0 JZPSTA NCOPRIME SEQN UCBINTC
ARITH CNURI18H FIBPOL KEQ NEO2 SEQPAR UFPR14D
ARTHEVAL CODESPTI FINDLR KMSL4B NFURY SHAMAN UNTITLE1
ASHMHF CODING2 FLING1 KONSTRAKSCHION NINJA7 SID UNTITLED
ASISTENT COLORSEG FRACTION KOPC12H NITT4 SKEY URJC2_F
AVLVKT COMCB FROGPARTY KPGRAPHS NNUM SKYLINE VECTAR11
BDOI16D CONNECT FRSKT KPRIMES2 NPC2014B SLIKAR VFRIEND2
BEMINE CONTEST FTOUR KPURSUIT NPC2015B SMALLM VGCD
BIA COUNTDIO GANNHAT KRECT NUMGAME SNAKYNUM VIENTIAN
BIT2 COVER2 GASWARS LCS0 NUMTRY SORTMAC VOL
BLAMOEBA COWPIC GCDEASY LEGO NWERC11J SPCO VZLA2019G
BLLUCK CRAYON GCJ08C LIFEGAME ONBRIDGE SPHIWAY WEIGHT
BLOCK_D CRYPTO2 GCJ2012C LITELANG ONORIVER1 SQRMINSUM WORDCNT2
BLOPER CS GCPC11H LOPOV OVICUMSUM SQRROOT XC
BLUNIQ CS345A1 GONESORT LUDIC1 PARITY STJEPAN YOUWIN
BNMT CYCLERUN GOODA MAIN113 PARTPALI STORE ZEBRA
BOI7FEN CYLINDER GORELIAN MAIN12B PBCGAME STRCOUNT
BOMB2 CYLINDES GUESSNM2 MAIN74 PCPC12H STRSEQ
BOOKCASE DCEPC14H HABLU MAIN8_E PCPC12I SUBSHARD
BOPERISH DCEPC702 HARSHAD MAP PERMPATT SUDOKU
BOWLING1 DCEPC807 HELPBOB MATNUM PIB SUMPRO