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Before contest
Codeforces Round 941 (Div. 1)
21:21:19
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Before contest
Codeforces Round 941 (Div. 2)
21:21:19
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→ Filter Problems
Difficulty:
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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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Custom test
Problems
#
Name
730G
Car Repair Shop
implementation
1600
x2099
730E
Award Ceremony
greedy
,
implementation
2200
x708
730D
Running Over The Bridges
greedy
,
implementation
,
math
2200
x679
730A
Toda 2
greedy
,
implementation
1800
x1550
729B
Spotlights
dp
,
implementation
1200
x7702
729A
Interview with Oleg
implementation
,
strings
900
x7253
727B
Bill Total Value
expression parsing
,
implementation
,
strings
1600
x1964
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2584
725B
Food on the Plane
implementation
,
math
1200
x5089
725A
Jumping Ball
implementation
1000
x7008
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2104
724B
Batch Sort
brute force
,
greedy
,
implementation
,
math
1500
x3967
724A
Checking the Calendar
implementation
1000
x6984
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1438
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6802
723B
Text Document Analysis
expression parsing
,
implementation
,
strings
1100
x9989
723A
The New Year: Meeting Friends
implementation
,
math
,
sortings
800
x70382
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x469
722B
Verse Pattern
implementation
,
strings
1200
x6342
722A
Broken Clock
brute force
,
implementation
1300
x6570
721B
Passwords
implementation
,
math
,
sortings
,
strings
1100
x11965
721A
One-dimensional Japanese Crossword
implementation
800
x18054
720E
Cipher
implementation
3100
x62
719A
Vitya in the Countryside
implementation
1100
x15385
718A
Efim and Strange Grade
dp
,
implementation
,
math
1700
x4317
717C
Potions Homework
implementation
,
sortings
1200
x3862
716A
Crazy Computer
implementation
800
x21755
714B
Filya and Homework
implementation
,
sortings
1200
x13997
714A
Meeting of Old Friends
implementation
,
math
1100
x10671
713A
Sonya and Queries
data structures
,
implementation
1400
x8318
712B
Memory and Trident
implementation
,
strings
1100
x9602
712A
Memory and Crow
implementation
,
math
800
x11508
711B
Chris and Magic Square
constructive algorithms
,
implementation
1400
x8348
711A
Bus to Udayland
brute force
,
implementation
800
x28787
710A
King Moves
implementation
800
x13433
709B
Checkpoints
greedy
,
implementation
,
sortings
1500
x4696
709A
Juicer
implementation
900
x29871
708B
Recover the String
constructive algorithms
,
greedy
,
implementation
,
math
1900
x3193
708A
Letters Cyclic Shift
constructive algorithms
,
greedy
,
implementation
,
strings
1200
x8844
707D
Persistent Bookcase
bitmasks
,
data structures
,
dfs and similar
,
implementation
2200
x2592
707A
Brain's Photos
implementation
800
x46040
706E
Working routine
data structures
,
implementation
2500
x1114
706B
Interesting drink
binary search
,
dp
,
implementation
1100
x58083
706A
Beru-taxi
brute force
,
geometry
,
implementation
900
x14242
705A
Hulk
implementation
800
x99051
704C
Black Widow
dp
,
graphs
,
implementation
,
math
2900
x457
704A
Thor
brute force
,
data structures
,
implementation
1600
x8929
703C
Chris and Road
geometry
,
implementation
2100
x1580
703B
Mishka and trip
implementation
,
math
1400
x5628
703A
Mishka and Game
implementation
800
x53381
702C
Cellular Network
binary search
,
implementation
,
two pointers
1500
x12969
702B
Powers of Two
brute force
,
data structures
,
implementation
,
math
1500
x11290
702A
Maximum Increase
dp
,
greedy
,
implementation
800
x41299
701A
Cards
greedy
,
implementation
800
x18844
699B
One Bomb
implementation
1400
x7506
699A
Launch of Collider
implementation
1000
x15139
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5662
697A
Pineapple Incident
implementation
,
math
900
x12567
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2046
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x5973
691C
Exponential notation
implementation
,
strings
1800
x2473
691B
s-palindrome
implementation
,
strings
1600
x4697
691A
Fashion in Berland
implementation
1000
x9873
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1806
689A
Mike and Cellphone
brute force
,
constructive algorithms
,
implementation
1400
x5184
688A
Opponents
implementation
800
x13689
686B
Little Robber Girl's Zoo
constructive algorithms
,
implementation
,
sortings
1100
x7696
686A
Free Ice Cream
constructive algorithms
,
implementation
800
x35354
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x477
681A
A Good Contest
implementation
800
x15021
680B
Bear and Finding Criminals
constructive algorithms
,
implementation
1000
x23325
680A
Bear and Five Cards
constructive algorithms
,
implementation
800
x12144
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x311
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1129
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x8921
678B
The Same Calendar
implementation
1600
x4018
678A
Johny Likes Numbers
implementation
,
math
800
x12516
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x581
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6271
677B
Vanya and Food Processor
implementation
,
math
1400
x7526
677A
Vanya and Fence
implementation
800
x129984
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1826
676B
Pyramid of Glasses
implementation
,
math
,
math
1500
x5456
676A
Nicholas and Permutation
constructive algorithms
,
implementation
800
x13619
673B
Problems for Round
greedy
,
implementation
1300
x3496
673A
Bear and Game
implementation
800
x9891
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17040
672A
Summer Camp
implementation
800
x14972
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4104
670D2
Magic Powder - 2
binary search
,
implementation
1500
x12955
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x15888
670C
Cinema
implementation
,
sortings
1300
x8910
670B
Game of Robots
implementation
1000
x10954
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3413
665A
Buses Between Cities
implementation
1600
x2859
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1616
660B
Seating On Bus
implementation
1000
x5210
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8511
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6137
659C
Tanya and Toys
greedy
,
implementation
1200
x11377
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