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Before contest
Codeforces Round 941 (Div. 1)
2 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
*has extra registration
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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
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x83644
579B
Finding Team Member
brute force
,
implementation
,
sortings
1300
x5181
579A
Raising Bacteria
bitmasks
1000
x55807
578F
Mirror Box
matrices
,
trees
3200
x529
578E
Walking!
constructive algorithms
,
greedy
2700
x614
578D
LCS Again
dp
,
greedy
2700
x777
578C
Weakness and Poorness
ternary search
2000
x4262
578B
"Or" Game
brute force
,
greedy
1700
x5110
578A
A Problem about Polyline
geometry
,
math
1700
x4683
577B
Modulo Sum
combinatorics
,
data structures
,
dp
,
two pointers
1900
x11425
577A
Multiplication Table
implementation
,
number theory
1000
x37937
576E
Painting Edges
binary search
,
data structures
3300
x1098
576D
Flights for Regular Customers
dp
,
matrices
2700
x1305
576C
Points on Plane
constructive algorithms
,
divide and conquer
,
geometry
,
greedy
,
sortings
2100
x3221
576B
Invariance of Tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2100
x1572
576A
Vasya and Petya's Game
math
,
number theory
1500
x13141
575I
Robots protection
data structures
2800
x421
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1628
575G
Run for beer
dfs and similar
,
shortest paths
2200
x865
575F
Bulbo
dp
,
greedy
2100
x983
575E
Spectator Riots
geometry
2800
x236
575D
Tablecity
constructive algorithms
,
implementation
1700
x1803
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x211
575B
Bribes
dfs and similar
,
graphs
,
trees
2200
x1038
575A
Fibonotci
data structures
,
math
,
matrices
2700
x756
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7591
574A
Bear and Elections
greedy
,
implementation
1200
x8959
573E
Bear and Bowling
data structures
,
greedy
3200
x1324
573D
Bear and Cavalry
data structures
,
divide and conquer
,
dp
3000
x445
573C
Bear and Drawing
constructive algorithms
,
dfs and similar
,
trees
2300
x951
573B
Bear and Blocks
binary search
,
data structures
,
dp
,
math
1600
x5623
573A
Bear and Poker
implementation
,
math
,
number theory
1300
x16267
572B
Order Book
data structures
,
greedy
,
implementation
,
sortings
1300
x6733
572A
Arrays
sortings
900
x16237
571E
Geometric Progressions
math
3200
x249
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x647
571C
CNF 2
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x609
571B
Minimization
dp
,
greedy
,
sortings
2000
x2522
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2006
570E
Pig and Palindromes
combinatorics
,
dp
2300
x1801
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6620
570C
Replacement
constructive algorithms
,
data structures
,
implementation
1600
x8965
570B
Simple Game
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1300
x15726
570A
Elections
implementation
1100
x13727
569B
Inventory
greedy
,
math
1200
x6945
569A
Music
implementation
,
math
1500
x4739
568E
Longest Increasing Subsequence
data structures
,
dp
3000
x572
568D
Sign Posts
brute force
,
geometry
,
math
2800
x298
568C
New Language
2-sat
,
greedy
2600
x773
568B
Symmetric and Transitive
combinatorics
,
dp
,
math
1900
x2219
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x4998
567F
Mausoleum
dp
2400
x561
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1601
567D
One-Dimensional Battle Ships
binary search
,
data structures
,
greedy
,
sortings
1700
x4640
567C
Geometric Progression
binary search
,
data structures
,
dp
1700
x9264
567B
Berland National Library
implementation
1300
x8329
567A
Lineland Mail
greedy
,
implementation
900
x30463
566G
Max and Min
geometry
2500
x333
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x3516
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x600
566D
Restructuring Company
data structures
,
dsu
1900
x3087
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x690
566B
Replicating Processes
constructive algorithms
,
greedy
2600
x259
566A
Matching Names
dfs and similar
,
strings
,
trees
2300
x868
560B
Gerald is into Art
constructive algorithms
,
implementation
1200
x7821
560A
Currency System in Geraldion
implementation
,
sortings
1000
x16805
559E
Gerald and Path
dp
,
sortings
3000
x854
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x423
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6128
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10346
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10275
558E
A Simple Task
data structures
,
sortings
,
strings
2300
x5558
558D
Guess Your Way Out! II
data structures
,
implementation
,
sortings
2300
x1105
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3914
558B
Amr and The Large Array
implementation
1300
x7753
558A
Lala Land and Apple Trees
brute force
,
implementation
,
sortings
1100
x10153
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1048
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2132
557C
Arthur and Table
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
1900
x3937
557B
Pasha and Tea
constructive algorithms
,
implementation
,
math
,
sortings
1500
x7075
557A
Ilya and Diplomas
greedy
,
implementation
,
math
1100
x8197
556B
Case of Fake Numbers
brute force
,
implementation
1100
x7869
556A
Case of the Zeros and Ones
greedy
900
x37789
555E
Case of Computer Network
dfs and similar
,
graphs
,
trees
2800
x2185
555D
Case of a Top Secret
binary search
,
implementation
,
math
2500
x857
555C
Case of Chocolate
data structures
2200
x1944
555B
Case of Fugitive
data structures
,
greedy
,
sortings
2000
x3680
555A
Case of Matryoshkas
implementation
1500
x6487
554B
Ohana Cleans Up
brute force
,
greedy
,
strings
1200
x9662
554A
Kyoya and Photobooks
brute force
,
math
,
strings
900
x12688
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x528
553D
Nudist Beach
binary search
,
graphs
,
greedy
2300
x972
553C
Love Triangles
dfs and similar
,
dsu
,
graphs
2200
x1725
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2094
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8367
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1408
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4351
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5381
552B
Vanya and Books
implementation
,
math
1200
x15180
552A
Vanya and Table
implementation
,
math
1000
x9327
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