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Before contest
Codeforces Round 941 (Div. 1)
21:51:04
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
21:51:04
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combinatorics
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
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x432
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x435
306C
White, Black and White Again
combinatorics
,
number theory
2100
x435
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x439
229E
Gifts
combinatorics
,
dp
,
math
,
probabilities
2600
x450
305D
Olya and Graph
combinatorics
,
math
2200
x452
985G
Team Players
combinatorics
2700
x455
833C
Ever-Hungry Krakozyabra
brute force
,
combinatorics
,
greedy
,
math
2700
x460
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x461
878E
Numbers on the blackboard
combinatorics
,
dp
3300
x471
1747E
List Generation
combinatorics
,
dp
,
math
2900
x482
1436F
Sum Over Subsets
combinatorics
,
math
,
number theory
2800
x490
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x493
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x499
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x501
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x502
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x506
1085G
Beautiful Matrix
combinatorics
,
data structures
,
dp
2900
x506
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x513
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x515
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x516
1221G
Graph And Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
meet-in-the-middle
2900
x518
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x520
856C
Eleventh Birthday
combinatorics
,
dp
,
math
2400
x522
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x526
1060F
Shrinking Tree
combinatorics
,
dp
2900
x527
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x528
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x538
852F
Product transformation
combinatorics
,
math
,
number theory
2200
x542
954H
Path Counting
combinatorics
,
dp
2500
x552
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x554
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x554
15E
Triangles
combinatorics
,
dp
2600
x556
1487G
String Counting
combinatorics
,
dp
,
fft
,
math
2700
x573
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x574
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x578
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x579
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x581
1545C
AquaMoon and Permutations
2-sat
,
brute force
,
combinatorics
,
constructive algorithms
,
graph matchings
,
graphs
2800
x582
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x588
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x591
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x594
1906H
Twin Friends
combinatorics
,
dp
2200
x599
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x600
1762E
Tree Sum
combinatorics
,
math
,
trees
2600
x600
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x609
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x621
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x621
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x622
1906J
Count BFS Graph
combinatorics
,
dp
2100
x623
295D
Greg and Caves
combinatorics
,
dp
2400
x634
814E
An unavoidable detour for home
combinatorics
,
dp
,
graphs
,
shortest paths
2600
x639
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x642
1336E1
Chiori and Doll Picking (easy version)
bitmasks
,
brute force
,
combinatorics
,
math
2700
x647
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x654
40E
Number Table
combinatorics
2500
x654
1673E
Power or XOR?
bitmasks
,
combinatorics
,
math
,
number theory
2500
x658
1097G
Vladislav and a Great Legend
combinatorics
,
dp
,
trees
3000
x658
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x664
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x665
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x667
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x671
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x683
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x684
1662N
Drone Photo
combinatorics
,
math
,
sortings
x687
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x696
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x700
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x701
1185G2
Playlist for Polycarp (hard version)
combinatorics
,
dp
2600
x705
111D
Petya and Coloring
combinatorics
,
dp
2300
x713
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x715
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x715
501E
Misha and Palindrome Degree
binary search
,
combinatorics
,
implementation
2500
x718
809C
Find a car
combinatorics
,
divide and conquer
,
dp
2600
x725
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x728
908E
New Year and Entity Enumeration
bitmasks
,
combinatorics
,
dp
,
math
2500
x733
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x734
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x740
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x741
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x745
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x745
1383E
Strange Operation
combinatorics
,
data structures
,
dp
2800
x747
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x749
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x751
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x751
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x757
1740F
Conditional Mix
combinatorics
,
dp
,
math
2600
x758
666C
Codeword
combinatorics
,
strings
2500
x760
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x761
293B
Distinct Paths
brute force
,
combinatorics
2700
x772
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x774
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x782
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
x793
1251F
Red-White Fence
combinatorics
,
fft
2500
x798
830D
Singer House
combinatorics
,
dp
,
graphs
,
trees
2800
x798
722E
Research Rover
combinatorics
,
dp
2900
x798
1542E2
Abnormal Permutation Pairs (hard version)
combinatorics
,
dp
,
fft
,
math
2700
x802
1425D
Danger of Mad Snakes
combinatorics
,
dp
,
math
2300
x802
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x805
1516E
Baby Ehab Plays with Permutations
combinatorics
,
dp
,
math
2500
x810
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