YSH2020's profile

Name Yong Siu Hei
School nush
Role admin
Country Singapore
View Submissions
Solved Problems
01knapsack 0405 1111galpassword 1402
1402_2 1503 1609 1821
3nplus1 3nplus1II 3raptors 4in1again
4russians 4sum 727 7up
GSS NYCanteen NYSSW_easy NYSport
OrXor SameMapInTheRpgWorld Unbalanced WA1
abbb abc_apio23 abcs add1_easy
addictiontoworry addition addition2 addition3
adjacentswaps adjlist adjmatrix adventure
airplane airplane2 alienalien amicablecats
ancestor aoi_fft aoi_game aoi_umbrella
applebaskets applefarm aratherinterestingtube arcwrecker2
area area2 area_noi armpit
arrayfind arraygraph arrayngement arrayproblem
artclass assembly assistance atleasttripledate
atomsplit attractions badcontest badnim
badpotato badtone33 ballot bananafarm
bananasmoothie bank basement basketball
basketball_cpic beareatrabbit belittle bestplace
bftrouble bigredarrow binarycoins binarylock
binaryroads binarysearch binaryspells bingo
blackmagic blank blanko boardvision
bobek bombardirocrocodilo bookshelf bosses
boundlessboxes boxes4 boxes_hkicpc boxinbox2
boxispull bracketex brackets bracketstack
bracketsyndrome breakfast brick bronzemedal
bsta buffet buildingfences burgers
buycomputer buygifts buyingcandy caesarcats
cakes calc candies candies3
candies_ioi candles candymountain_ex candyshop
cappuccinoassassino car card cardplacing
cards cardtrick carpark carrots
casino catalansum catfight catlunch
catsort ccs celldivision charges
cheerleaders chessislands chickensoup childsetter2
childsetter4 childsetter5 childvschild chinese
choochoo choose2eat1 choosingcandies chope
christmasfeast cht clearingleaves clique
clocktower closedpath closingshop cny
coinbag coincombinations coingame coinjourney
coins coke cokelesssugar cokemoresugar
collectmushrooms collectmushrooms2 collectmushrooms3 collectmushrooms6
combo commando commonsubseq commonsubstring
competition compleecode conductslip conlang
connections construct container contestcalc
conversations conversations_easy convexhull cookieclickeralpha
countalp country cowland cpicgame
cpicsort createnumber crypto cuberoot
cups cupstacking dayum deathray
decayedbridges deccourse2025 deciphering_zane_4 deciphering_zane_ex
deda defense101 deforestation deliveroo
democracy deque descsort devour
diamond dice differencearray digits
dijkstra dinowalk discharging discord
div3 divideby2 divisibility division
dna_ioi do_you_like_me dogfood dogmonkey
doll doll_noi doubleflip downbad
dquery drama drones duckbuttons
duckeatant duckeatduck duckhunt duckhunt11
duckhunt12 duckhunt13 duckhunt14 duckhunt15
duckhunt16 duckhunt17 duckhunt18 duckhunt19
duckhunt2 duckhunt20 duckhunt21 duckhunt22
duckhunt23 duckhunt24 duckhunt25 duckhunt27
duckhunt28 duckhunt29 duckhunt3 duckhunt30
duckhunt31 duckhunt32 duckhunt33 duckhunt36
duckhunt37 duckhunt38 duckhunt4 duckhunt41
duckhunt42 duckhunt5 duckhunt6 duckhunt67
duckhunt7 duckhunt8 ducktransport duckwander
dyingpolynomial dynamicdag eatcake eating
eatinghealthy eatingkids eatingparallelograms economics
eeducation eelimination eeniemeenie eescapism
eevacuation eexploration eight el_classico
employee entropy entropy2 enwisen
equals erp eta evans_peculiar_hobby
evenorodd evenorodd_ex everyonewinstherace evilbz
exam exam2 examinations examstress
exhibition experimentexplodeexpel explosion exponentiate
exponentiate_easy exponentiate_ex f7 factorial
factorial_easy factorial_ex factorymachines fans
fatty feast feedtheduck fenwicktree
fenwicktree_easy ferriswheel fibo fibo_easy
fibo_ex finalday findinggrass_ex findingpavement
findmultiple fireandbeary fireworks firstabc
fitnesscorner fizzbuzz flamethrower flamethrower_ex
flappyrabbit flights flip flipcards
floors flows flybot foodchain
foreveralone foxfamilies fractional_knapsack fractions
fraud frog3 frogs fuel
fuji funnyballs funnynim funnysequence
gather gather_ex gcd gecko
general generosity gentlepairs gfriendmania
giantduck gift givinggifts globalwarming
glottalstops goodbye goodgame goodprogrammer
goodseq goofyarray goofyrooks goombatower
gota gotoschool gotoschool_ex graphcraft
grassplant greenbeans greeting grid
guanine guardingtreasure guards guards_ex
guessproblem guessqueue guessvegetable gwynethandtree
gymbadges hacked hacking hallucinations
hammeringnails hamster1 harddisk hashcollision
heatwv hedgehogcrimes_easy hello helloworld
helloworld2 hipercijevi history hld
hld_easy hld_easy_2 hogdog homeworkextension
hoofpaperscissor hop housing hungrycats
hungrycats2 hungryrabbits1 identifyinggirlfriends idetestevennumbers
ihate1111 ihatenonint illuminate impossiblegame
index indextimesa inheritance installingapps
installingapps_ex integer integralmania intercastellar
inversioncounting inversions ippt iqtest
iqtest2 iqtest3 iroha isitpriming
itinerary jamestreet japan2026 jaydenscurve
jewels joke jokers journey3
jumping2 jumpontree justright kangaroohunt
kfc knapsack knightmoves labels
labs ladybugs laptop lasers
lasers3 lazy_robot lboard lcm
lcpupqst lcs leave leenbeetree
leftout leftright legotowers lemon
lemonade lemonade2 lengthsort letters
levelingup levenshtein lfs lightningrod
lineup lineup2 lis lis_easy
littlejohnny0 littlejohnny1 littlejohnny2 littlejohnny3
littlejohnny5 littlejohnny6 ljll ljubomora
lllontree localexpress logs lol
longesttrip lookback losingsleep lostarray
lostones lowelements lppfnlcst lualectures
luarulers luckynumbers2 lunchbox lunchcombo
lunchtime lvm magicboard magiccarps
magicspell magicstring magicwand maintainsum
makingparallelograms management mandarins manyjobs
mathclass matheletes mathexam mathhomework
mathmadness matrixrotation matsuri maxavg
maximum medianheap medianstring mergeguessproblem
mergevectors milkweed mindeque minimise
minimum minstack miracleflover missingnumber
modsum modules modulochain moka
molecules moneychanger monkeyjourney monkeys
monopoly monstergo monsters monsters2
motest motest2 mothertounge motivation
mountain mountainjourney mountains movingbasement
movingkids mrt mrt2 mugger
multiple multipleswith8 neckties nemo
nerdinvitation network nevergiveup newjeans
nextprime nicenumber nihonese nile
ningning nis nombor noodlestore
nostatement notduckhunt nou nprime
ntuc numberfun numbergame numberspeak
numberspiral numericalstrings ny_mathexam ny_unwind
nycheer nycoordinates nylunchtime nystudy
obstacletree oddoneout oddqueries omnomnom
omnomnom2 oneforone ontheedge openingshop0
optmilk oranges2 orchard oridance
orz packaging packingducks padoru
paint pairofballs pairs pairsums
palindromicfizzbuzz pancake pandacity pandaeyes
panicbutton papaya parade parallelogramisation
parallelogramisation2 parallelomex park party
party_noi pascal password payraise
peakfinding peddler peepeepoopoo penguinfood
penguingathering penguinmountain perfectprimes performance
permutationgrid photo photofinish physics
picnic pigeonhole pigeons pilot
ping pizzeria plagia plantingpotatoes2
platonic platonic10 platonic11 platonic12
platonic13 platonic16 platonic17 platonic2
platonic23 platonic27 platonic28 platonic29
platonic3 platonic4 platonic5 platonic6
platonic9 playlist playlist2 plural
poi pokenumbers poklon polyomino
ponschool postcard potatoqueue potatosalad
potatotree potionseasy potionshard powerfulmaxsum
powervillage pplow prefixsums prime
primeage primefactorization primepie primesort
priorityqueue prisoners problematicjourney problemsetter
problemsetter2 procrastination progressionspells progressive
promotion psle purplecandy pushups
pythonlist quillvsowl rabbitbars rabbiteatrabbit
rabbitjoke rabbitmeeting rabbitpainting race
railgun railway rainbowrabbit rangerangequery
rank raptorinc rarsum razlika
rblock reading reciprocals redblacktree
replacedigits replacingpavement restaurant retrenchment
reverse reverseandmin reversiblecampaign rhythmscore
rightangtri ring2 rmaxq roadconstruction
roadsideadverts robotbombs robotonring1 robotonring2
robotrotation robots2 rollercoaster rootedlca
rop rotarylock rotate round_up_division
routers routine runaway runway
sadtrainer sadtrainer2 safety samelength
sana sandd scalars scanner
scicom sealevel seats2 secret
segmenttree segmenttree2 segmenttreebeats segtreebeats
september sequence_apio seventeen shamelessad
shamelessad2 shamelessad3 shamelessad4 shamelessad5
shamelessad5_ex shamelessad6 sherlockinversions shiritori
shiritori_ex shoes shops shortest
shuttlerun sightseeing sightseeing2 simcity
simp simplebridges singlefile singleflip
sixandseven sixseven skibuddy skillmoves
skips skribbl skyline slidefk
slimes smallprimes smallprimes_ex smurf
smurfpaths snack snacks snail
snake snakenladder sniper snowball
socks solonim sonictheparallelogram sonya
soos soos2 sort sort2
sorting2 sortingtrainers sos sparsetable
speakers specialgirlfriends spellofweakness splithunny
spreadsheet squidzofrenzic ssoca stability
staircase stamps stamps2 stepgame
stickytape stones stoningame stonk
subgraphs subknapsack subperm subsetmex
subtaskstitching sudoku2 sum sum2
sumint summarising2020 summarising2023 summarising2024
summarising2025 summarizing2021 summationfrenzy summit
sumofdigits sumstack sumsumdigit supermarket
supperbox supplies swapbuildings swapgame
swapsort swayingflowers swords taskmanaging
taxcollection team telephone teleporter2
teleporting thedarknight thumper2 tickethandling
timeexam topical topsilver tourism
tourist tourist_noi towerdefense towers
train train_ex traineeline trainorbus
trains tralalerolarila transform transmit
trapezes trashinteractive travel trials
triangle trippitroppi triusis trivialexam
trivialexam_ex_ex trivialmaths trollingbribritt tst
tungtungtungtungtungsahur twoarrays twochoices twomeals
typicalstairs typo typoswap uiro
ultimateifelse uniquenumbers uniquenumbers_easy universe
upsanddownsofinvesting urarareader usefft1 vainish
variety vectorindexing verticallychallenged veryeasymath
veryeasyproblem videogames visitor volcano
voting votingcities wabbit wabot
walking warp watching waterbomb
waterbottles waterbottles2 waterbottles3 wateringplants
weddingcoins whackamole whaleaura whalegroups
whalemewing whaleroles whiteboardgame whoatethefries
winter woodcutter workload workoutplan
wormholes wronganswer wrongreverse wv
xmas xorb xortree xuehuapiaopiao
yaleuniversity yayornay yogurt youtubealgo
yunah zaneism zanesgift zanesletters
zanespresents zooqueue