Problems
All Problems
Newest Problems
Unsolved Problems
Recommended Problems
Contests
Submissions
Clarifications
Others
Announcements
Rankings
Credits
Learning Resources
C++ Reference
Donate!
Login
blackscreen1's profile
Name
Derrick Lukimin
School
Hwa Chong Institution
Role
admin
Country
Singapore
View Submissions
Solved Problems
01knapsack
0405
1402
1402_2
1503
1609
1821
3nplus1
3nplus1II
4russians
4sum
727
7up
GSS
NYSport
SameMapInTheRpgWorld
Unbalanced
abbb
abc_apio23
add1
add1_easy
addition
addition2
addition3
addk
addone
adjacentswaps
adjlist
adjmatrix
aircon
airplane
alienalien
amicablecats
ancestor
appeal
applefarm
appletree
arcade
area
area_noi
armpit
arrayfind
arraypartition
arrayproblem
assembly
assistance
atleasttripledate
atm
attractions
bacteria
badnim
badpotato
ballgame
ballot
bananafarm
bananasmoothie
bank
basement
baseplans
basketball
beacon
beareatrabbit
beautifulbrackets
becomingred
belittle
bestplace
bftrouble
binarycoins
binaryroads
binaryspells
bingo
blank
boardvision
bobek
bombing
bombing2
bookshelf
bosses
bosubaiko
bottle
boundedpermutation
boundlessboxes
boxes_hkicpc
boxispull
bracketex
brackets
bracketscore
bracketsuperseq
bracketsyndrome
breakfast
brick
bridge_apio15
buffet
bunnyscore
burgers
buycoke
buycomputer
buygifts
buyingcandy
cake
candies
candies_joi
candles
candyboxes
candymountain_ex
candyshop
car
card
cardgame
cardtrick
carpark
carrots
casino
catchingcheaters
catfight
catleap
catlunch
cave
ccs
change
charges
cheerleaders
chessislands
chinese
choochoo
chope
christmasfeast
christmaxtrees
cht
chunlian
cinema
clique
clocktower
closedrooms
closingshop
cny
coinbag
coincombinations
coinjourney
coke
cokelesssugar
collectmushrooms
collectmushrooms2
collectmushrooms3
collectmushrooms6
combo
commando
commonsubstring
competition
compleecode
conductslip
conlang
construct
container
contestcalc
conversations
conversations_easy
convexhull
cookieclickeralpha
cooperation
countalp
cowland
crypto
cuberoot
cudak
cups
curtains
cycling
deathray
decayedbridges
deciphering_zane
deciphering_zane_4
deda
defense101
deforestation
deletingnumbers
deliveroo
democracy
deque
descsort
devour
diamond
digits
dijkstra
dinowalk
discharging
divideby2
divisibility
dna_ioi
dogmonkey
doll_noi
dotjoin
doubleflip
doubletrip
doubletrouble
dquery
drones
duckduckgo
duckeatduck
ducknuggetconvention
ducktransport
duckwander
dyingpolynomial
dynamicdag
eatcake
eating
eeducation
eelimination
eeniemeenie
eescapism
eevacuation
eexploration
eight
election
employee
entropy
entropy2
erp
eta
evenorodd
exam
examinations
exhibition
explosion
exponentiate
exponentiate_ex
f7
factorial
factorial_easy
feast
feedtheduck
feedthewallabies
feelgood
fenwicktree
fenwicktree_easy
ferries
fibble
fibo
fibo_easy
figurines
findinggrass_ex
findingpavement
findmultiple
fireandbeary
firecracker
firefighting
firelord
firstabc
fizzbuzz
flamethrower
flamethrower_ex
flappyrabbit
flights
flip
flipcards
floors
flybot
foodchain
foreveralone
fortunetelling
fractionalmultiset
fractions
fraud
frog3
frogs
fruits
fruitsequences
fuel
fuelstation
garden
gcd
gecko
general
generosity
gentlepairs
gfriendmania
gift
girlfriend
globalwarming
glottalstops
gohcart
goinghome_agc
goodbye
goodprogrammer
goodseq
goofyrooks
goombatower
gotoschool
gotoschool_ex
gotosleep
gotoubun
graphcraft
grassplant
greenbeans
greeting
grid
gridgame
growingtrees
guanine
guards
guards_ex
guessproblem
guessproblem2
guessproblem3
guessproblem3_ex
guessproblem4_ex
guessqueue
gwynethandtree
gymbadges
hacking
hackthectf
hamster1
harddisk
hashcollision
hdb
heatwv
hedgehogcrimes_easy
helloworld
helloworld2
hiddenarray
history
hld
hole
homeworkextension
hoofpaperscissor
housevisit
housing
humantrafficking
hungrycats
hungryrabbits1
hungryrabbits2
identifyinggirlfriends
ihate1111
illuminate
imagination
indivisibility
inheritance
inspections
installingapps
integralmania
inversions
ippt
iqtest
iqtest2
iqtest3
iqtest4
jamestreet
journey3
jumpontree
justright
kfc
knapsack
knightmoves
kthsubstring
kusac
labels
ladybugs
laptop
lasers
lazycat
lboard
lcm
lcs
leave
leftright
lemmas
lengthsort
letters
letterstamper
levelingup
levenshtein
lfs
lightningrod
lineup
lineup2
lis
lis_easy
ljll
ljubomora
llis
localexpress
logs
lol
losingsleep
lostarray
lowelements
lps
lratio
lualectures
luarulers
luckynumbers2
lunchbox
lunchcombo
lunchtime
lvm
magiccarps
magicstring
magicwand
makemst
makingparallelograms
malcolm
management
mandarins
manycolours
manyjobs
mathclass
maxavg
maximum
medianheap
medianstring
melons_joig
mergeguessproblem
milkweed
minimise
minimum
mining
minstack
miracleflover
missingnumber
modsum
modules
modulochain
moneychanger
monopoly
monsters
motest
motest2
motest3
mothertounge
motivation
mountainbridges
mountains
mrbeancurd
mrt
mugger
multipaths
mushroomfarm
naptime
neckties
nemo
nerdinvitation
network
nevergiveup
nextprime
nicenumber
nicewelltakethat
nihonese
nis
nombor
nonboringsequences
noodlestore
nou
nprime
nprime2
numberfun
numbergame
numbers
numericalstrings
ny_mathexam
ny_unwind
nycheer
nycoordinates
nylunchtime
nystudy
obstacles
obstacletree
oddoneout
omnomnom
omnomnom2
ontheedge
optimalsubseq
optmilk
oranges2
orchard
oridance
orz
packaging
packingducks
padoru
paint
pairs
pairsums
palindromicfizzbuzz
pancake
pandacity
pandaeyes
papaya
parade
parallelogramfest
parallelogramisation
park
party
party_noi
pascal
password
payraise
peakfinding
peddler
peepeepoopoo
penghulu
penguinfood
penguingathering
penguinislands
penguinmountain
perfectprimes
performance
photo
picnic
pigeonhole
pigeonnests
pigeons
pilot
ping
pizzeria
playlist
poi
pokeadd
pokenumbers
poklon
postcard
potatosalad
potatotree
potionseasy
potionshard
powervillage
prefixsums
prime
primeage
primefactorization
primepie
primesort
problematicjourney
problemsetter
progression
progressionspells
promotion
psle
purplecandy
pushups
pythonindentation
queuecutting
quillvsowl
rabbiteatrabbit
rabbitmeeting
rabbitpainting
race
railway
rainbowrabbit
rank
rarsum
razlika
rblock
reading
reciprocals
rectangleoutline
redblacktree
relaymarathon
removalcosts
reopening
replacedigits
restaurant
reverseandmin
riggedroads
rightangtri
rmaxq
rmq
roadsideadverts
rootedlca
rotarylock
routers
routine
rubies
runway
samelength
sandd
scalars
scanner
sealevel
seats2
segmenttree
segmenttree2
shamelessad
shamelessad2
sherlockinversions
shops
shortest
shuttlerun
sightseeing
sightseeing2
simcity
simp
simplebridges
simpletask
singlefile
singleflip
skillmoves
skyline
slimes
smallprimes
smallprimes_ex
smurf
smurfpaths
snack
snail
snakenladder
snakesnack2
snapknack
sniper
snowball
snowcow
socks
solonim
sonictheparallelogram
sonya
soos
sort
sortbooks
sortingtrainers
sortingtrainers2
sos
spaceinvaders
speakers
special
specialgirlfriends
spellofweakness
splithunny
splittingpower
square_ioi
squidzofrenzic
stackweights
staircase
stamps
stepgame
sterilizing
stickytape
stones
stonk
stories
strikes
stringsofimpurity
subgraphs
subknapsack
subtaskstitching
sumint
summarising2020
summarising2023
summarizing2021
summit
sumofdigits
supermarket
supperbox
supplies
swapsort
swayingflowers
swimming
swords
taxcollection
telepathy
telephone
teleporting
thedarknight
tickethandling
tiles
timeexam
topical
tour
tourism
tourist
tourist_noi
towerdefense
towers
train
train_ex
traineeline
trains
transform
trashinteractive
travel
treasurehunt
treecutting
treepruning
treepruning2
trivialexam
trivialexam_ex_ex
trivialmaths
troubles
twomeals
typicalstairs
typo
typoswap
ultimateifelse
uniquenumbers
universe
unluckyfloors
unmerge
vainish
variety
verticallychallenged
veryeasymath
veryeasyproblem
votingcities
wabbit
wabot
walking
wallabyhop
warp
warp2
watching
waterbomb
waterbottles
weddingcoins
whackamole
whatisthisactf
whiteboardgame
whoatethefries
wires
woodcutter
workload
workoutplan
wormholes
xmas
xorb
xorsplit
xuehuapiaopiao
yaleuniversity
yayornay
zanesgift
zanesletters
zooqueue