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Before contest
Codeforces Round 941 (Div. 1)
27:35:17
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
27:35:17
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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
698F
Coprime Permutation
combinatorics
,
number theory
3000
x428
698E
Cron
2800
x113
698D
Limak and Shooting Points
brute force
,
geometry
,
math
2600
x502
698C
LRU
bitmasks
,
dp
,
math
,
probabilities
2400
x1273
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5601
698A
Vacations
dp
1400
x28364
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5662
697A
Pineapple Incident
implementation
,
math
900
x12566
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x119
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x476
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1217
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2045
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3377
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x5972
691F
Couple Cover
brute force
,
dp
,
number theory
2200
x1244
691E
Xor-sequences
matrices
1900
x2353
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5280
691C
Exponential notation
implementation
,
strings
1800
x2473
691B
s-palindrome
implementation
,
strings
1600
x4697
691A
Fashion in Berland
implementation
1000
x9873
690F3
Tree of Life (hard)
trees
3200
x45
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x78
690F1
Tree of Life (easy)
1300
x2108
690E2
Photographs (II)
2600
x141
690E1
Photographs (I)
1800
x664
690D3
The Wall (hard)
dp
2100
x489
690D2
The Wall (medium)
combinatorics
1800
x1208
690D1
The Wall (easy)
1200
x2545
690C3
Brain Network (hard)
trees
2200
x881
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3570
690C1
Brain Network (easy)
1300
x2680
690B3
Recover Polygon (hard)
data structures
2600
x90
690B2
Recover Polygon (medium)
geometry
2600
x194
690B1
Recover Polygon (easy)
1700
x923
690A3
Collective Mindsets (hard)
2400
x514
690A2
Collective Mindsets (medium)
2300
x686
690A1
Collective Mindsets (easy)
1100
x2761
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1806
689D
Friends and Subsequences
binary search
,
data structures
2100
x3055
689C
Mike and Chocolate Thieves
binary search
,
combinatorics
,
math
1700
x4864
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x5587
689A
Mike and Cellphone
brute force
,
constructive algorithms
,
implementation
1400
x5184
688B
Lovely Palindromes
constructive algorithms
,
math
1000
x30127
688A
Opponents
implementation
800
x13688
687E
TOF
dfs and similar
,
graphs
2900
x310
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x849
687C
The Values You Can Make
dp
1900
x4923
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5534
687A
NP-Hard Problem
dfs and similar
,
graphs
1500
x13728
686B
Little Robber Girl's Zoo
constructive algorithms
,
implementation
,
sortings
1100
x7696
686A
Free Ice Cream
constructive algorithms
,
implementation
800
x35346
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x502
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x477
685C
Optimal Point
binary search
,
math
2900
x576
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3762
685A
Robbers' watch
brute force
,
combinatorics
,
dp
,
math
1700
x4142
683J
The Hero with Bombs
*special problem
3000
x40
683I
Loader
*special problem
,
graphs
2500
x38
683H
Exchange of Books
*special problem
1900
x95
683G
The Fraction
*special problem
1900
x130
683F
Reformat the String
*special problem
1800
x146
683E
Hammer throwing
*special problem
1800
x187
683D
Chocolate Bar
*special problem
,
math
1400
x319
683C
Symmetric Difference
*special problem
1600
x314
683B
The Teacher of Physical Education
*special problem
1600
x316
683A
The Check of the Point
*special problem
,
geometry
1200
x785
682E
Alyona and Triangles
geometry
,
two pointers
2600
x646
682D
Alyona and Strings
dp
,
strings
1900
x3171
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x6983
682B
Alyona and Mex
sortings
1200
x11080
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20405
681E
Runaway to a Shadow
geometry
,
sortings
2500
x448
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1717
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x7249
681B
Economy Game
brute force
1300
x8749
681A
A Good Contest
implementation
800
x15019
680B
Bear and Finding Criminals
constructive algorithms
,
implementation
1000
x23323
680A
Bear and Five Cards
constructive algorithms
,
implementation
800
x12143
679E
Bear and Bad Powers of 42
data structures
3100
x659
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
679B
Bear and Tower of Cubes
binary search
,
dp
,
greedy
2200
x2111
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12283
678F
Lena and Queries
data structures
,
divide and conquer
,
geometry
2500
x823
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x1896
678D
Iterated Linear Function
math
,
number theory
1700
x4261
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x8921
678B
The Same Calendar
implementation
1600
x4018
678A
Johny Likes Numbers
implementation
,
math
800
x12515
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x581
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1520
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6271
677B
Vanya and Food Processor
implementation
,
math
1400
x7525
677A
Vanya and Fence
implementation
800
x129948
676E
The Last Fight Between Human and AI
math
2400
x882
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1826
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x17997
676B
Pyramid of Glasses
implementation
,
math
,
math
1500
x5456
676A
Nicholas and Permutation
constructive algorithms
,
implementation
800
x13619
675E
Trains and Statistic
data structures
,
dp
,
greedy
2300
x2597
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