Problems
All Problems
Newest Problems
Unsolved Problems
Recommended Problems
Contests
Submissions
Clarifications
Others
Announcements
Rankings
Credits
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
abbb
abc_apio23
addition
addition2
addk
adjacentswaps
adjlist
adjmatrix
aircon
alienalien
amicablecats
ancestor
appeal
applefarm
area
area_noi
armpit
arrayfind
arraypartition
arrayproblem
assembly
bacteria
badnim
badpotato
ballgame
ballot
bananafarm
bananasmoothie
bank
basketball
beacon
beareatrabbit
becomingred
bestplace
binarycoins
binaryroads
binaryspells
bingo
bobek
bookshelf
bosses
boundedpermutation
boundlessboxes
boxispull
bracketex
brackets
bracketscore
bracketsuperseq
bracketsyndrome
breakfast
brick
buffet
burgers
buycoke
buycomputer
buygifts
candies
candles
candyboxes
candymountain_ex
candyshop
car
card
cardtrick
carpark
carrots
catchingcheaters
catfight
catlunch
ccs
change
charges
cheerleaders
chessislands
chinese
choochoo
christmasfeast
christmaxtrees
chunlian
clique
clocktower
closedrooms
closingshop
cny
coinbag
coincombinations
coinjourney
coke
collectmushrooms
collectmushrooms2
collectmushrooms3
collectmushrooms6
combo
commando
commonsubstring
competition
conlang
construct
contestcalc
conversations
conversations_easy
convexhull
cookieclickeralpha
countalp
crypto
cuberoot
cups
cycling
deathray
decayedbridges
deciphering_zane
deforestation
deletingnumbers
deliveroo
deque
descsort
devour
diamond
digits
dijkstra
dinowalk
discharging
divisibility
dna_ioi
dogmonkey
doll_noi
dotjoin
doubletrip
dquery
drones
duckduckgo
duckwander
dyingpolynomial
eatcake
eating
eeducation
eelimination
eeniemeenie
eescapism
eevacuation
election
employee
entropy
entropy2
erp
evenorodd
exam
examinations
exhibition
explosion
exponentiate
exponentiate_ex
f7
feast
feedthewallabies
feelgood
fenwicktree
fenwicktree_easy
ferries
fibo
findinggrass_ex
fireandbeary
firecracker
firelord
firstabc
fizzbuzz
flamethrower
flappyrabbit
flights
flip
flipcards
floors
flybot
foodchain
foreveralone
fractionalmultiset
fractions
fraud
frog3
frogs
fruitsequences
fuel
fuelstation
garden
gcd
gecko
general
generosity
gentlepairs
gift
girlfriend
globalwarming
gohcart
goinghome_agc
goodprogrammer
goodseq
gotoschool
gotoschool_ex
gotoubun
graphcraft
grassplant
greenbeans
greeting
grid
gridgame
growingtrees
guanine
guards
guards_ex
guessproblem
guessproblem2
guessproblem3
guessqueue
gwynethandtree
gymbadges
hacking
hackthectf
hamster1
harddisk
hashcollision
hdb
heatwv
hedgehogcrimes_easy
helloworld
helloworld2
hiddenarray
history
hld
hole
homeworkextension
hoofpaperscissor
housing
humantrafficking
hungryrabbits1
hungryrabbits2
ihate1111
illuminate
inheritance
inversions
ippt
iqtest
iqtest2
iqtest3
iqtest4
journey3
jumpontree
justright
kfc
knapsack
knightmoves
kthsubstring
labels
ladybugs
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
lostarray
lps
lratio
lualectures
luarulers
luckynumbers2
lunchbox
lunchcombo
lvm
magicwand
malcolm
management
mandarins
manycolours
maximum
medianheap
medianstring
melons_joig
milkweed
minimum
minstack
modsum
modulochain
moneychanger
monopoly
monsters
motest
motest2
mountainbridges
mountains
mrbeancurd
mrt
mugger
naptime
neckties
nemo
nevergiveup
nextprime
nicenumber
nihonese
nis
nonboringsequences
nou
nprime
numberfun
numbers
numericalstrings
obstacles
obstacletree
omnomnom
omnomnom2
optimalsubseq
optmilk
oranges2
orchard
oridance
packaging
padoru
paint
pairs
pairsums
palindromicfizzbuzz
pandacity
pandaeyes
papaya
parade
parallelogramfest
party
pascal
payraise
peakfinding
peddler
penghulu
penguinfood
penguinislands
perfectprimes
performance
picnic
pigeonhole
pigeonnests
pigeons
pilot
ping
pizzeria
poi
pokenumbers
poklon
potatosalad
potatotree
potionseasy
potionshard
prefixsums
prime
primefactorization
primepie
primesort
problematicjourney
progression
promotion
psle
purplecandy
pushups
pythonindentation
quillvsowl
rabbiteatrabbit
railway
rainbowrabbit
rank
razlika
rblock
reading
reciprocals
rectangleoutline
redblacktree
removalcosts
reopening
replacedigits
restaurant
rightangtri
rmaxq
roadsideadverts
rootedlca
rotarylock
routers
routine
rubies
runway
samelength
sandd
scalars
scanner
sealevel
segmenttree
segmenttree2
sherlockinversions
shortest
sightseeing
sightseeing2
simcity
simp
simplebridges
simpletask
singlefile
singleflip
skillmoves
skyline
slimes
smallprimes
smallprimes_ex
smurf
smurfpaths
snack
snail
snakenladder
snakesnack2
snapknack
snowball
socks
solonim
sonya
soos
sort
sortbooks
sortingtrainers
spaceinvaders
speakers
special
spellofweakness
splithunny
square_ioi
squidzofrenzic
staircase
stamps
stepgame
sterilizing
stickytape
stones
stonk
stories
subgraphs
subknapsack
subtaskstitching
sumint
summarising2020
summarizing2021
summit
supermarket
supperbox
supplies
swapsort
swayingflowers
swimming
swords
taxcollection
telepathy
telephone
timeexam
topical
tourist
towerdefense
towers
train
train_ex
trains
transform
travel
treecutting
treepruning
treepruning2
trivialexam
trivialexam_ex_ex
trivialmaths
twomeals
typicalstairs
typo
ultimateifelse
uniquenumbers
universe
unluckyfloors
unmerge
vainish
variety
veryeasyproblem
votingcities
wabbit
wabot
walking
wallabyhop
warp
watching
waterbottles
weddingcoins
whackamole
whatisthisactf
workload
workoutplan
wormholes
xmas
xorb
xorsplit
zooqueue