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Before contest
Codeforces Round (Div. 1)
5 days
Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
—
implementation
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
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Status
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Custom test
Problems
#
Name
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7850
478A
Initial Bet
implementation
1100
x25477
476A
Dreamoon and Stairs
implementation
,
math
1000
x43044
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8399
475A
Bayan Bus
implementation
1100
x4757
474B
Worms
binary search
,
implementation
1200
x47230
474A
Keyboard
implementation
900
x44583
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x131
471B
MUH and Important Things
implementation
,
sortings
1300
x5928
471A
MUH and Sticks
implementation
1100
x13401
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x673
469B
Chat Online
implementation
1300
x12565
469A
I Wanna Be the Guy
greedy
,
implementation
800
x95701
467C
George and Job
dp
,
implementation
1700
x14477
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x37224
467A
George and Accommodation
implementation
800
x119387
466A
Cheap Travel
implementation
1200
x62296
465B
Inbox (100500)
implementation
1000
x10384
465A
inc ARG
implementation
900
x10003
463D
Gargari and Permutations
dfs and similar
,
dp
,
graphs
,
implementation
1900
x6301
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8688
463B
Caisa and Pylons
brute force
,
implementation
,
math
1100
x26877
463A
Caisa and Sugar
brute force
,
implementation
1200
x9219
462A
Appleman and Easy Task
brute force
,
implementation
1000
x16800
461C
Appleman and a Sheet of Paper
data structures
,
implementation
2200
x1327
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12264
460A
Vasya and Socks
brute force
,
implementation
,
math
900
x45382
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x39834
459A
Pashmak and Garden
implementation
1200
x32345
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x5862
454B
Little Pony and Sort by Shift
implementation
1200
x18082
454A
Little Pony and Crystal Mine
implementation
800
x14736
452D
Washer, Dryer, Folder
greedy
,
implementation
1900
x1495
452A
Eevee
brute force
,
implementation
,
strings
1000
x7969
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3319
451B
Sort the Array
implementation
,
sortings
1300
x44704
451A
Game With Sticks
implementation
900
x64769
450B
Jzzhu and Sequences
implementation
,
math
1300
x25972
450A
Jzzhu and Children
implementation
1000
x34045
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1530
448B
Suffix Structures
implementation
,
strings
1400
x15950
448A
Rewards
implementation
800
x24124
447B
DZY Loves Strings
greedy
,
implementation
1000
x20225
447A
DZY Loves Hash
implementation
800
x9548
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12456
445A
DZY Loves Chessboard
dfs and similar
,
implementation
1200
x29253
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4047
443A
Anton and Letters
constructive algorithms
,
implementation
800
x87992
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2103
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1096
441C
Valera and Tubes
constructive algorithms
,
dfs and similar
,
implementation
1500
x11140
441B
Valera and Fruits
greedy
,
implementation
1400
x7039
441A
Valera and Antique Items
implementation
1000
x18411
440B
Balancer
greedy
,
implementation
1600
x1962
440A
Forgotten Episode
implementation
800
x7242
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3835
439B
Devu, the Dumb Guy
implementation
,
sortings
1200
x14218
439A
Devu, the Singer and Churu, the Joker
greedy
,
implementation
900
x25197
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9401
437A
The Child and Homework
implementation
1300
x8968
436B
Om Nom and Spiders
implementation
,
math
1400
x3048
435C
Cardiogram
implementation
1600
x2556
435A
Queue on Bus Stop
implementation
1000
x10109
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1241
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2426
433B
Kuriyama Mirai's Stones
dp
,
implementation
,
sortings
1200
x38503
433A
Kitahara Haruki's Gift
brute force
,
implementation
1100
x16175
432B
Football Kit
brute force
,
greedy
,
implementation
1200
x11617
432A
Choosing Teams
greedy
,
implementation
,
sortings
800
x58675
431C
k-Tree
dp
,
implementation
,
trees
1600
x25314
431B
Shower Line
brute force
,
implementation
1200
x10706
431A
Black Square
implementation
800
x53879
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1417
427B
Prison Transfer
data structures
,
implementation
1100
x13860
427A
Police Recruits
implementation
800
x76242
426B
Sereja and Mirroring
implementation
1300
x3792
426A
Sereja and Mugs
implementation
800
x9114
424B
Megacity
binary search
,
greedy
,
implementation
,
sortings
1200
x7450
424A
Squats
implementation
900
x8352
421A
Pasha and Hamsters
constructive algorithms
,
implementation
800
x5947
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1246
420B
Online Meeting
implementation
1800
x1026
420A
Start Up
implementation
1000
x6073
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4647
417B
Crash
implementation
1400
x1766
417A
Elimination
dp
,
implementation
,
math
1500
x2958
416D
Population Size
greedy
,
implementation
,
math
2400
x940
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x7831
416B
Art Union
brute force
,
dp
,
implementation
1300
x8612
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8812
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6219
415A
Mashmokh and Lights
implementation
900
x8931
413B
Spyke Chatting
implementation
1300
x1694
413A
Data Recovery
implementation
1200
x2597
412E
E-mail Addresses
implementation
1900
x839
412C
Pattern
implementation
,
strings
1200
x3910
412A
Poster
greedy
,
implementation
900
x4399
411C
Kicker
implementation
1700
x1222
411B
Multi-core Processor
implementation
1600
x1273
411A
Password Check
*special problem
,
implementation
800
x7172
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