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Before contest
Codeforces Round 941 (Div. 1)
06:57:38
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
06:57:37
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combinatorics
combine-tags-by-or
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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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Problems
#
Name
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x965
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x951
1784D
Wooden Spoon
combinatorics
,
dp
2400
x948
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x947
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x931
1037F
Maximum Reduction
combinatorics
,
data structures
,
math
2500
x929
285E
Positions in Permutations
combinatorics
,
dp
,
math
2600
x927
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x926
1558D
Top-Notch Insertions
combinatorics
,
data structures
2600
x923
1007B
Pave the Parallelepiped
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2400
x921
1817C
Similar Polynomials
combinatorics
,
math
2400
x918
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x917
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x916
1111D
Destroy the Colony
combinatorics
,
dp
,
math
2600
x916
1670F
Jee, You See?
bitmasks
,
combinatorics
,
dp
2400
x915
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x913
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x909
1691F
K-Set Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2500
x904
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x892
1737E
Ela Goes Hiking
combinatorics
,
dp
,
math
,
probabilities
2500
x888
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x880
140E
New Year Garland
combinatorics
,
dp
2600
x870
1574E
Coloring
combinatorics
,
constructive algorithms
,
implementation
,
math
2500
x867
1096E
The Top Scorer
combinatorics
,
dp
,
math
,
probabilities
2500
x859
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x856
1750F
Majority
combinatorics
,
dp
,
math
,
strings
2700
x855
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x855
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x854
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x851
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x848
1264D2
Beautiful Bracket Sequence (hard version)
combinatorics
,
probabilities
2900
x846
1034C
Region Separation
combinatorics
,
dp
,
number theory
,
trees
2700
x844
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x841
891E
Lust
combinatorics
,
math
,
matrices
3000
x841
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x840
1237F
Balanced Domino Placements
combinatorics
,
dp
2600
x821
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x820
1909F2
Small Permutation Problem (Hard Version)
combinatorics
,
dp
,
math
2500
x819
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x815
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
x812
1516E
Baby Ehab Plays with Permutations
combinatorics
,
dp
,
math
2500
x810
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x805
1542E2
Abnormal Permutation Pairs (hard version)
combinatorics
,
dp
,
fft
,
math
2700
x802
1425D
Danger of Mad Snakes
combinatorics
,
dp
,
math
2300
x802
1251F
Red-White Fence
combinatorics
,
fft
2500
x798
830D
Singer House
combinatorics
,
dp
,
graphs
,
trees
2800
x798
722E
Research Rover
combinatorics
,
dp
2900
x798
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x782
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x774
293B
Distinct Paths
brute force
,
combinatorics
2700
x772
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x762
666C
Codeword
combinatorics
,
strings
2500
x760
1740F
Conditional Mix
combinatorics
,
dp
,
math
2600
x758
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x757
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x752
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x752
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x749
1383E
Strange Operation
combinatorics
,
data structures
,
dp
2800
x747
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x745
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x745
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x741
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x740
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x734
908E
New Year and Entity Enumeration
bitmasks
,
combinatorics
,
dp
,
math
2500
x733
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x728
809C
Find a car
combinatorics
,
divide and conquer
,
dp
2600
x725
501E
Misha and Palindrome Degree
binary search
,
combinatorics
,
implementation
2500
x718
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x715
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x715
111D
Petya and Coloring
combinatorics
,
dp
2300
x713
1185G2
Playlist for Polycarp (hard version)
combinatorics
,
dp
2600
x705
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x701
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x701
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x696
1662N
Drone Photo
combinatorics
,
math
,
sortings
x687
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x685
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x683
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x671
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x668
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x665
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x664
1097G
Vladislav and a Great Legend
combinatorics
,
dp
,
trees
3000
x659
1673E
Power or XOR?
bitmasks
,
combinatorics
,
math
,
number theory
2500
x658
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x654
40E
Number Table
combinatorics
2500
x654
1336E1
Chiori and Doll Picking (easy version)
bitmasks
,
brute force
,
combinatorics
,
math
2700
x647
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x642
814E
An unavoidable detour for home
combinatorics
,
dp
,
graphs
,
shortest paths
2600
x640
295D
Greg and Caves
combinatorics
,
dp
2400
x634
1906J
Count BFS Graph
combinatorics
,
dp
2100
x624
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x622
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x621
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x621
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x609
1906H
Twin Friends
combinatorics
,
dp
2200
x601
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x601
1762E
Tree Sum
combinatorics
,
math
,
trees
2600
x600
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x594
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x591
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x588
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