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Before contest
Codeforces Round 941 (Div. 1)
3 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
3 days
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→ Filter Problems
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dfs and similar
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
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string suffix structures
strings
ternary search
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Problems
#
Name
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2437
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2424
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1926
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1655
316B1
EKG
brute force
,
dfs and similar
1500
x1358
377A
Maze
dfs and similar
1600
x21272
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x19238
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x15010
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x13785
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x12238
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x11802
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x11609
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x10432
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10169
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10076
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9388
1006E
Military Problem
dfs and similar
,
graphs
,
trees
1600
x9387
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9367
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9171
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x8835
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8681
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8351
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7291
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7081
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x6982
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6800
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6762
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6284
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6069
768B
Code For 1
constructive algorithms
,
dfs and similar
,
divide and conquer
1600
x5826
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5612
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x5587
741A
Arpa's loud Owf and Mehrdad's evil plan
dfs and similar
,
math
1600
x5393
616C
The Labyrinth
dfs and similar
1600
x5293
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5135
34D
Road Map
dfs and similar
,
graphs
1600
x4844
131D
Subway
dfs and similar
,
graphs
1600
x4495
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4377
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4362
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4329
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3944
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2516
316B2
EKG
dfs and similar
,
dp
1600
x1565
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16081
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13736
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x12898
1144F
Graph Without Long Directed Paths
dfs and similar
,
graphs
1700
x10699
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10393
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x10297
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9787
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x9276
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9240
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x8818
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x8786
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8513
1093D
Beautiful Graph
dfs and similar
,
graphs
1700
x8457
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8375
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8114
1693B
Fake Plastic Trees
dfs and similar
,
dp
,
greedy
,
trees
1700
x8035
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7752
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7581
1850H
The Third Letter
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1700
x7443
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7073
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7069
1027D
Mouse Hunt
dfs and similar
,
graphs
1700
x6985
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6910
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x6840
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x6819
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6717
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6529
1722F
L-shapes
dfs and similar
,
implementation
1700
x6503
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6496
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6403
216B
Forming Teams
dfs and similar
,
implementation
1700
x6071
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x5932
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x5833
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5776
813C
The Tag Game
dfs and similar
,
graphs
1700
x5640
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5601
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5518
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5277
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4529
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3605
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3482
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3477
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3377
896A
Nephren gives a riddle
binary search
,
dfs and similar
1700
x3335
756A
Pavel and barbecue
constructive algorithms
,
dfs and similar
1700
x2957
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x2096
747E
Comments
dfs and similar
,
expression parsing
,
implementation
,
strings
1700
x1937
213A
Game
dfs and similar
,
greedy
1700
x1684
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x973
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x13492
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9328
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x8978
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8843
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8032
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x7978
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7461
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6673
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