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Before contest
Codeforces Round 941 (Div. 1)
3 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
3 days
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→ Filter Problems
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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
#
Name
978E
Bus Video System
combinatorics
,
math
1400
x9197
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x17533
975C
Valhalla Siege
binary search
1400
x9360
962C
Make a Square
brute force
,
implementation
,
math
1400
x7741
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5214
958D1
Hyperspace Jump (easy)
expression parsing
,
math
1400
x2029
958A1
Death Stars (easy)
implementation
1400
x1634
955B
Not simply beatiful strings
implementation
1400
x4731
954B
String Typing
implementation
,
strings
1400
x7092
940B
Our Tanya is Crying Out Loud
dp
,
greedy
1400
x8803
937B
Vile Grasshoppers
brute force
,
math
,
number theory
1400
x6784
934A
A Compatible Pair
brute force
,
games
1400
x6698
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2491
928B
Chat
*special problem
,
dp
1400
x2489
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x8982
911C
Three Garlands
brute force
,
constructive algorithms
1400
x6951
907B
Tic-Tac-Toe
implementation
1400
x4006
898C
Phone Numbers
implementation
,
strings
1400
x5125
888C
K-Dominant Character
binary search
,
implementation
,
two pointers
1400
x8050
868B
Race Against Time
implementation
1400
x3628
865A
Save the problem!
constructive algorithms
1400
x4135
851B
Arpa and an exam about geometry
geometry
,
math
1400
x5417
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5521
838A
Binary Blocks
brute force
1400
x906
816B
Karen and Coffee
binary search
,
data structures
,
implementation
1400
x16343
808C
Tea Party
constructive algorithms
,
greedy
,
sortings
1400
x5952
804B
Minimum number of steps
combinatorics
,
greedy
,
implementation
,
math
1400
x9511
803A
Maximal Binary Matrix
constructive algorithms
1400
x4735
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4262
799B
T-shirt buying
data structures
,
implementation
1400
x8358
797B
Odd sum
dp
,
greedy
,
implementation
1400
x10130
770D
Draw Brackets!
*special problem
,
implementation
1400
x1567
762B
USB vs. PS/2
greedy
,
implementation
,
sortings
,
two pointers
1400
x7456
762A
k-th divisor
math
,
number theory
1400
x17869
757B
Bash's Big Day
greedy
,
math
,
number theory
1400
x9789
748C
Santa Claus and Robot
constructive algorithms
,
math
1400
x4539
745B
Hongcow Solves A Puzzle
implementation
1400
x3702
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x6878
719B
Anatoly and Cockroaches
greedy
1400
x8331
713A
Sonya and Queries
data structures
,
implementation
1400
x8318
711B
Chris and Magic Square
constructive algorithms
,
implementation
1400
x8348
710B
Optimal Point on a Line
brute force
,
sortings
1400
x8514
703B
Mishka and trip
implementation
,
math
1400
x5628
699B
One Bomb
implementation
1400
x7505
698A
Vacations
dp
1400
x28356
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5662
689A
Mike and Cellphone
brute force
,
constructive algorithms
,
implementation
1400
x5184
683D
Chocolate Bar
*special problem
,
math
1400
x319
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12275
677B
Vanya and Food Processor
implementation
,
math
1400
x7522
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7280
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x15880
665B
Shopping
brute force
1400
x3475
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4550
650A
Watchmen
data structures
,
geometry
,
math
1400
x15024
649B
Этажи
constructive algorithms
1400
x518
641B
Little Artem and Matrix
implementation
1400
x3733
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2409
632B
Alice, Bob, Two Teams
brute force
,
constructive algorithms
1400
x3884
630L
Cracking the Code
implementation
,
math
1400
x3444
630H
Benches
combinatorics
,
math
1400
x4733
614B
Gena's Code
implementation
,
math
1400
x6757
612C
Replace To Make Regular Bracket Sequence
data structures
,
expression parsing
,
math
1400
x7486
604B
More Cowbell
binary search
,
greedy
1400
x8231
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x10386
581C
Developing Skills
implementation
,
math
,
sortings
1400
x7238
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x19369
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8263
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x17030
544B
Sea and Islands
constructive algorithms
,
implementation
1400
x7801
538B
Quasi Binary
constructive algorithms
,
dp
,
greedy
,
implementation
1400
x17567
538A
Cutting Banner
brute force
,
implementation
1400
x7046
534B
Covered Path
dp
,
greedy
,
math
1400
x9836
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4464
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9171
523C
Name Quest
*special problem
,
greedy
1400
x2466
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x47712
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x7791
515C
Drazil and Factorial
greedy
,
math
,
sortings
1400
x24884
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20112
513B1
Permutations
brute force
1400
x3575
507B
Amr and Pins
geometry
,
math
1400
x23783
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x12062
493B
Vasya and Wrestling
implementation
1400
x12985
492C
Vanya and Exams
greedy
,
sortings
1400
x13664
489C
Given Length and Sum of Digits...
dp
,
greedy
,
implementation
1400
x44284
485A
Factory
implementation
,
math
,
matrices
1400
x8083
479C
Exams
greedy
,
sortings
1400
x28459
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7538
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8217
472C
Design Tutorial: Make It Nondeterministic
greedy
1400
x6313
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x664
448B
Suffix Structures
implementation
,
strings
1400
x15627
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12062
441B
Valera and Fruits
greedy
,
implementation
1400
x6921
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x13467
436B
Om Nom and Spiders
implementation
,
math
1400
x3039
435B
Pasha Maximizes
greedy
1400
x6735
430B
Balls Game
brute force
,
two pointers
1400
x3621
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4605
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