Problems
All Problems
Newest Problems
Unsolved Problems
Recommended Problems
Contests
Submissions
Clarifications
Others
Announcements
Rankings
Credits
Learning Resources
C++ Reference
Donate!
Login
PlayVoltz's profile
Name
Ryan Shaw
School
Ngee Ann Secondary School
Role
admin
Country
Singapore
View Submissions
Solved Problems
01knapsack
0405
1111galpassword
1402
1402_2
1503
1609
1821
3nplus1
3nplus1II
4cuts
4in1
4in1again
4russians
4sum
727
7up
GSS
NYAerion
NYCanteen
NYSSW_easy
NYSport
NYTrainers
OrXor
Pickaxe
SameMapInTheRpgWorld
Unbalanced
WA1
abbb
abcs
acorns
add1
add1_easy
addictiontoworry
addition
addition2
addition3
addk
addone
adjacentswaps
adjlist
adjmatrix
adventure
aircon
airplane
alienalien
aliens
aliens_ioi
alphabrackets
amicablecats
ancestor
ants
anutforajaroftuna
appeal
applebaskets
applefarm
appletree
arcade
archaeologist
arcwrecker2
area
area_noi
armpit
arrayfind
arraygraph
arraypartition
arrayproblem
artswap
askonegetonefree
assembly
assignpaths
assistance
atleasttripledate
atm
attention
attractions
babyproduction
bacteria
badchef
badnim
badpotato
badtone33
badtree
ballgame
ballot
ballsofbuma
bananafarm
bananafever
bananaland
bananasmoothie
bank
banks
basement
baseplans
basketball
beacon
beareatrabbit
beautifulbrackets
belittle
bestplace
between2arrays
bftrouble
binarycoins
binarylock
binaryroads
binaryspells
binarystring
bingeeating
bingo
binomial
biscuits
bizarrebuffet
blackmagic
blank
blanko
boardvision
bobek
bombing
bombing2
books
bookshelf
boring
bossbattle
bosses
bosubaiko
bottle
boundedpermutation
boundlessboxes
boxes
boxes2
boxes_hkicpc
boxhaskey
boxinbox
boxinbox2
boxispull
bracketex
brackets
bracketscore
bracketsuperseq
bracketsyndrome
brainrot
breakfast
brick
bridge_apio15
bubblesort
bucketstacking
buffet
build
bunnyscore
burger
burgers
buycoke
buycomputer
buygifts
buyingcandy
cake
cake3
cakerun
camels
candies
candies2
candies_joi
candles
candyboxes
candymountain_ex
candyshop
car
card
cardgame2
cards
cardtrick
carpark
carrots
casino
catchingcheaters
catfight
catgameshow
catleap
catlunch
catnames
cats
catsort
catteams
cave
ccs
celldivision
centroid
chaewon
change
charges
cheerleaders
chessislands
chickensoup
childsetter
childsetter2
childsetter3
childvschild
chimera
chinese
chocolate
chokolit
choochoo
choose2eat1
choosingcandies
chope
christmasfeast
christmaxtrees
cht
chunlian
cinema
cipele
clique
clocktower
closedpath
closedrooms
closing
closingshop
cny
coin
coinbag
coincombinations
coingame
coinjourney
coinmaster
coins
coke
cokelesssugar
cokemoresugar
collectmushrooms
collectmushrooms2
collectmushrooms3
collectmushrooms4
collectmushrooms5
collectmushrooms6
colorgraph
colour
colourblind
colourfulpaths
combo
commando
commonsubseq
commonsubsequence
commonsubstring
compact
competition
compleecode
conductslip
conlang
construct
container
contestcalc
convention
conversations
conversations_easy
convexhull
cookie
cookieclickeralpha
cooperation
coprimecodependence
copyandpaste
countalp
countingagain
couples
coupons
cousin
cowland
cp2booksales
crab
createnumber
cringemeter
crypto
cuberoot
cudak
cups
curtains
cyberland_apio23
datacenters
deathray
decayedbridges
deciphering_zane
deciphering_zane_4
deciphering_zane_ex
decrypt
deda
defense101
deforestation
deletingnumbers
deliveringpotatoes
deliveroo
democracy
departure
deque
descsort
destroy
devil
devour
diamond
dice
diesel
differencearray
digits
dijkstra
dinnerbox
dinowalk
discharging
discord
distribution
diversesegments
divideby2
divisibility
divsum
divsum_dec18
dkdk
dna
dna_ioi
dogmonkey
doll_noi
domine
dotjoin
doubleflip
doubletrip
doubletrouble
downbad
dquery
dragonfly
dreaming
drones
duckduckgo
duckeatant
duckeatduck
duckhunt
duckhunt2
duckhunt3
duckhunt4
duckhunt5
duckhunt6
duckhunt7
ducknuggetconvention
ducktransport
duckwalk
duckwander
duckwar
duels
dummy
dungeons2
dyingpolynomial
dynamicdag
dzumbus
eatcake
eating
eeducation
eelimination
eeniemeenie
eescapism
eevacuation
eexploration
eight
election
employee
entropy
entropy2
equals
erp
escalation
eta
evenorodd
everyonewinstherace
exam
examinations
examstress
examstress2
examstress2_ex
exhibition
exoticplants
experimentexplodeexpel
explosion
explosives
exponentiate
exponentiate_ex
f7
fabric
factorial
factorial_easy
factories
fakeidol
feast
feedtheduck
feedthewallabies
feelgood
fenwicktree
fenwicktree_easy
ferries
fertile
fibble
fibo
fibo_easy
figurines
finalday
findandprevent
findinggf
findinggrass_ex
findingpavement
findmultiple
fireandbeary
firecracker
firefighting
firelord
fireworks
firstabc
fish
fitnesscorner
fizzbuzz
flamethrower
flamethrower_ex
flappyrabbit
flights
flip
flipcards
flipthat
floors
flowering
flows
flybot
foodchain
football
foreveralone
fortunetelling
fourbuckets
fractional_knapsack
fractionalmultiset
fractions
fraud
friend
frog3
frogs
fruits
fruitsequences
fsylll
fuel
fuelstation
funfair
funniernim
funnynim
funnysequence
galaxycollapse
gap
garden
garden_ioi05
garden_ioi08
gcd
gecko
general
generosity
gentlepairs
gerrymandering
gerrymandering_ex
gfriendmania
gfriendtree
ghostrule
giantduck
gift
girlfriend
giselle
givinggifts
globalwarming
globalwarming_ceoi
globalwarming_ex
glottalstops
gohcart
gohcart2
goinghome_agc
goneviral
goodbye
goodchef
goodmorning
goodprogrammer
goodseq
goofyarray
goofyrooks
goombatower
gotoschool
gotoschool_ex
gotosleep
gotoubun
graph
graphcraft
graphoverflow
grassplant
gravity
grazing
greenbeans
greeting
grid
gridgame
growingtrees
guanine
guards
guards_easy
guards_ex
guessarray
guessproblem
guessproblem2
guessproblem3
guessproblem3_ex
guessproblem4
guessproblem4_ex
guessqueue
gwynethandtree
gymbadges
hacked
hacking
hackinggate
hackingscores
hackthectf
hammeringnails
hamster1
happyarrays
harddisk
hashcollision
hdb
heatwv
hedgehogcrimes_easy
hello
hellokitty
helloworld
helloworld2
hiddenarray
hipercijevi
historical
history
hld
hole
homeworkextension
hoofpaperscissor
hop
horses
hotelhunt
hotelhunt_easy
hotelhunt_ex
hotelhunting
hotspot
housevisit
housing
humantrafficking
hungrycats
hungryrabbits1
hungryrabbits2
hunter
hurt
hypeboy
identifyinggirlfriends
ihate1111
ihatenonint
illuminate
imagination
index
indextimesa
indivisibility
infinitezoo
inheritance
inspections
installingapps
integralmania
intercastellar
interestring
invasion
inversemax
inversioncounting
inversions
ippt
iqtest
iqtest2
iqtest3
island
islands2
jamestreet
jams
jewels
jjooii2
joke
journey3
jumping2
jumpontree
justright
karina
kas
kfc
knapsack
knightmoves
koopatroopacave
kthsubstring
kusac
labels
labs
ladybugs
lambsrespite
lampposts
lamps
landgame
laptop
lasers
latex
laughter
lazycat
lboard
lcm
lcs
learning
leave
leenbeetree
leftright
lemmas
lemonade
lemonade2
lemonadestand
lengthsort
letters
letterstamper
letterstamper_ex
levelingup
levenshtein
lfs
lightningrod
lightsflip
lineup
lineup2
lis
lis_easy
ljll
ljubomora
llis
lllontree
localexpress
log
logs
lol
lonelybeavers
lopov
losingsleep
lostarray
lostones
loveletter
lowelements
lps
lratio
lualectures
luarulers
luckynumbers2
lunchbox
lunchcombo
lunchtime
lvm
magicboard
magiccarps
magicspell
magicstring
magicwand
makingparallelograms
malcolm
malguem
mamamintaplusa
management
mandarins
manycolours
manyjobs
markinghouses
mate
math
mathclass
mathexam
mathmadness
mathtest
matsuri
maxavg
maximum
maximummonogonosity
maximumtriangle
medianheap
medianontree
medianstring
melons_joig
meltylandnightmare
mememagic
merchant
merchant2
mercurypoisoning
mergeguessproblem
mice
milkweed
mindeque
minimise
minimum
mining
minstack
miracleflover
missingnumber
mobitel
modsum
modules
modulochain
molecules
moneychanger
moneytree
mononono
monopoly
monsters
more_lca
morefun
morexiaoyang
motest
motest2
motest3
mothertounge
motivation
mountain
mountainbridges
mountains
movingbasement
movingkids
mrbeancurd
mrbeast
mrt
mrt2
mugger
mulgogi
multipaths
multiple
multipleswith8
mushroomfarm
naan
naptime
neckties
nemo
nerdinvitation
network
nevergiveup
newjeans
nextprime
nicenumber
nicewelltakethat
nihonese
ningning
nis
nombor
nomorebp
nonboringsequences
noodlestore
nostatement
nou
nprime
nprime2
numberbuilding
numberfun
numbergame
numbers
numberspiral
numericalstrings
nutritionist
ny_mathexam
ny_unwind
nycheer
nycoordinates
nylunchtime
nypromo
nystudy
obstacles
obstacletree
oddoneout
omnomnom
omnomnom2
onlineexam
ontheedge
openingshop
optimalsubseq
optmilk
orangecollector
oranges2
orchard
orchard2
oridance
orz
overthinking
packaging
packingducks
packingpests
padoru
paint
pairofballs
pairs
pairs_atcoder
pairsums
palindromicfever
palindromicfizzbuzz
pancake
pancake_ex
pandacity
pandaeyes
pandanumbers
pandaski
pandasoldiers
papaya
parade
parade_nyoi
parallelogramfest
parallelogramisation
parallelogrampairs
park
partitiongame
party
party_noi
pascal
passwords
pavement
payraise
peakfinding
peddler
peepeepoopoo
pekora
penghulu
penguinex
penguinfood
penguingathering
penguinislands
penguinmountain
perfectprimes
performance
permutationgrid
permutationswap
personalspace
photo
photo_nyoi
photograph
picnic
pigeonhole
pigeonnests
pigeons
pilot
ping
pipes
pizzeria
placingrouters
plagia
planning
plantingpotatoes
plantingpotatoes2
playlist
ples
poi
pokeadd
pokenumbers
poklon
police
polyomino
ponteng
portals
postcard
potatoqueue
potatosalad
potatosqueues
potatotree
potionseasy
potionshard
power
powervillage
pplow
prefixgcd
prefixsums
prime
primeage
primefactorization
primepie
primesort
problematicjourney
problemsetter
problemsetter2
progression
progressionspells
promotion
psle
purplecandy
pushups
puttingstrings
pythonindentation
qualityinspections
qualitytime
queuecutting
quillvsowl
rabbitbars
rabbitbridges
rabbiteatrabbit
rabbitmeeting
rabbitmilk
rabbitpainting
rabbitplane
rabbitroad
rabbittolls
race
radioactive
railway
rainbow
rainbowfish
rainbowrabbit
rainbowroad
rainbowroad_ex
rangedeleting
rangerangequery
rank
raptorinc
rarsum
rating
razlika
rblock
rbpoints
reachability
reading
rebuild
reciprocals
reciprocate
rectangleoutline
redblacktree
relaymarathon
removalcosts
removeedges
removeelements
reopening
repairs
replacedigits
replacingpavement
republiccity
restaurant
reverseandmin
reversiblecampaign
richzhe
riggedroads
rightangtri
rmaxq
rmq
roadsideadverts
roadtrip
robberduck
robobear
robotonring1
robotonring2
robotonring3
robotrotation
robots
rockclimbing
rolling
rooms
rootedlca
rop
rotarylock
routers
routes
routine
royalguards
rubies
runaway
runway
rushing
sadtrainer
sadtrainer2
sailor
sale
samelength
sandcity
sandd
sardines
sawmills
scalars
scanner
schedule
seagame
sealevel
seats2
secret
segmenttree
segmenttree2
segmenttreebeats
selectingintervals
selfdefence
selfpermutation
sellingpotatoes
semiconnected
september
sequence
sequence_apio
sequences
settingquestions
shamelessad
shamelessad2
shamelessad3
shamelessad4
shamelessad5
shamelessad5_ex
sherlockinversions
shikandgame
shirts
shoes
shoop
shops
shortest
showertheduck
shuffling
shuttlerun
sightseeing
sightseeing2
sillysort
simcity
simp
simplebridges
simplemath2
simpletask
singlefile
singleflip
skibuddy
skiing
skillmoves
skyline
skyscraper_apio15
slimes
smallprimes
smallprimes_ex
smurf
smurfpaths
snack
snail
snake
snakecode
snakenladder
snakesnack
snakesnack2
snapknack
sniper
snowball
snowcow
snukethewizard
soccer
socks
solarstorm
solonim
sonictheparallelogram
sonya
sort
sortbooks
sorting2
sortingtrainers
sortingtrainers2
sos
spaceinvaders
speakers
special
specialgirlfriends
spellofweakness
spiraldance
split2
splithunny
splittingpower
spy
square_ioi
squarerect
squidzofrenzic
ssoca
ssw
stackweights
staircase
stamps
stations
stepgame
sterilizing
stickytape
stones
stoning
stonk
stories
strawberry
streakmanipulation
streets
strikes
stringsofimpurity
subgraphs
subknapsack
subsetmex
subtaskstitching
sudoku2
sufferingprogrammer
sum
sumalllis
sumint
summarising2020
summarising2023
summarizing2021
summit
sumo
sumofdigits
sumsumdigit
sunshine
superduper
supermarket
superpiece
supertrees
supperbox
supplies
swap
swapsort
swayingflowers
swimming
swords
taxcollection
taxes
team
tears
telephone
teleporting
testing4
thanossort
thanossort_st4
thedarknight
thief
threetowers
threetwentyoneam
thunderstorm
tickethandling
tiles
timeexam
tmp
toilettime
tomandjerry
topical
torturingaccountant
tour
tourism
tourist
tourist_noi
towerdefense
towers
towers_noi
train
train_ex
traineeline
trains
trains_mco
trampoline
transform
transportingpotatoes
trapezes
trashinteractive
travel
treasurehunt
treasures
treecutting
treepruning
treepruning2
triangles
trianglesum
triusis
trivialexam
trivialexam_ex
trivialexam_ex_ex
trivialmaths
trollingbribritt
troubles
truck
twoarrays
twochoices
twomeals
typicalstairs
typo
typoswap
ultimateifelse
umbrella
uniquenumbers
uniquepath
universe
unluckyfloors
unmerge
usefft1
vainish
variety
verticallychallenged
veryeasymath
veryeasyproblem
visitinggf
visitingsingapore
visitor
volcanic
voting
votingcities
vouchers
wa2
wabbit
wabbitosu
wabot
walking
wall
wallabyhop
warp
warp2
watching
waterbomb
waterbottles
waterbottles2
waterbottles3
weddingcoins
weightedguess
whackamole
whatisthisactf
whiteboardgame
whoatethefries
wikipedia
winter
wires
wiring
woodcutter
workload
workload2
workoutplan
worldend
worldline
wormholes
wronganswer
xmas
xorb
xortree
xuehuapiaopiao
yaleuniversity
yayornay
youngmaids
youtubealgo
zanesgift
zanesletters
zoo
zooqueue