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Please read
the new rule regarding the restriction on the use of AI tools
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→ Pay attention
Before contest
Codeforces Round 978 (Div. 2)
6 days
→ Filter Problems
Difficulty:
—
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
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Status
Standings
Custom test
Problems
#
Name
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x2301
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12623
1139B
Chocolates
greedy
,
implementation
1000
x16385
1139A
Even Substrings
implementation
,
strings
800
x16786
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x4024
1138A
Sushi for Two
binary search
,
greedy
,
implementation
900
x18203
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x467
1137E
Train Car Selection
data structures
,
greedy
2700
x510
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1599
1137C
Museums Tour
dp
,
graphs
,
implementation
2500
x1205
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x6141
1137A
Skyscrapers
implementation
,
sortings
1600
x4468
1136E
Nastya Hasn't Written a Legend
binary search
,
data structures
2200
x1064
1136D
Nastya Is Buying Lunch
greedy
1800
x3813
1136C
Nastya Is Transposing Matrices
constructive algorithms
,
sortings
1500
x7712
1136B
Nastya Is Playing Computer Games
constructive algorithms
,
math
1000
x11698
1136A
Nastya Is Reading a Book
implementation
800
x16377
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3344
1133F1
Spanning Tree with Maximum Degree
graphs
1600
x7809
1133E
K Balanced Teams
dp
,
sortings
,
two pointers
1800
x5484
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x11822
1133C
Balanced Team
sortings
,
two pointers
1200
x22913
1133B
Preparation for International Women's Day
math
,
number theory
1200
x12777
1133A
Middle of the Contest
implementation
1000
x17360
1132G
Greedy Subsequences
data structures
,
dp
,
trees
2400
x1020
1132F
Clear the String
dp
2000
x8229
1132E
Knapsack
dfs and similar
,
dp
,
greedy
2300
x1470
1132D
Stressful Training
binary search
,
greedy
2300
x1924
1132C
Painting the Fence
brute force
1700
x5434
1132B
Discounts
greedy
,
sortings
900
x12938
1132A
Regular Bracket Sequence
greedy
,
implementation
1100
x9583
1131G
Most Dangerous Shark
data structures
,
dp
,
two pointers
2700
x431
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x6671
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1150
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3284
1131C
Birthday
binary search
,
greedy
,
sortings
1200
x14821
1131B
Draw!
greedy
,
implementation
1400
x9723
1131A
Sea Battle
math
800
x12410
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8589
1130B
Two Cakes
greedy
1200
x7914
1130A
Be Positive
implementation
800
x11620
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x439
1129D
Isolation
data structures
,
dp
2900
x1055
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x919
1129B
Wrong Answer
constructive algorithms
2000
x2206
1129A2
Toy Train
brute force
,
greedy
1800
x4100
1129A1
Toy Train (Simplified)
brute force
,
greedy
1700
x3822
1121C
System Testing
implementation
1600
x1995
1121B
Mike and Children
brute force
,
implementation
1200
x8982
1121A
Technogoblet of Fire
implementation
,
sortings
1100
x7185
1120F
Secret Letters
data structures
,
dp
,
greedy
3100
x257
1120E
The very same Munchhausen
brute force
2600
x126
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1371
1120C
Compress String
dp
,
strings
2100
x2105
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x424
1120A
Diana and Liana
greedy
,
implementation
,
two pointers
1900
x1639
1119H
Triple
fft
,
math
3200
x566
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x501
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x720
1119E
Pavel and Triangles
brute force
,
dp
,
fft
,
greedy
,
ternary search
1900
x5009
1119D
Frets On Fire
binary search
,
sortings
1800
x4830
1119C
Ramesses and Corner Inversion
constructive algorithms
,
greedy
,
implementation
,
math
1500
x6830
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x11054
1119A
Ilya and a Colorful Walk
greedy
,
implementation
1100
x10793
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x535
1118F1
Tree Cutting (Easy Version)
dfs and similar
,
trees
1800
x5936
1118E
Yet Another Ball Problem
constructive algorithms
,
implementation
1700
x4151
1118D2
Coffee and Coursework (Hard Version)
binary search
,
greedy
1700
x6288
1118D1
Coffee and Coursework (Easy version)
brute force
,
greedy
1700
x5685
1118C
Palindromic Matrix
constructive algorithms
,
implementation
1700
x5779
1118B
Tanya and Candies
implementation
1200
x12159
1118A
Water Buying
math
800
x20144
1117G
Recursive Queries
data structures
2500
x687
1117F
Crisp String
bitmasks
,
dp
2500
x578
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1520
1117D
Magic Gems
dp
,
math
,
matrices
2100
x4278
1117C
Magic Ship
binary search
1900
x7038
1117B
Emotes
greedy
,
math
,
sortings
1000
x14372
1117A
Best Subsegment
implementation
,
math
1100
x11019
1115U3
Block unitary
*special problem
1700
x197
1115U2
Chessboard unitary
*special problem
1600
x234
1115U1
Anti-diagonal unitary
*special problem
1500
x256
1115G3
Palindrome checker oracle
*special problem
1600
x231
1115G2
OR oracle
*special problem
1600
x312
1115G1
AND oracle
*special problem
1100
x388
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1946
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2841
1114D
Flood Fill
dp
1900
x6796
1114C
Trailing Loves (or L'oeufs?)
brute force
,
implementation
,
math
,
number theory
1700
x7403
1114B
Yet Another Array Partitioning Task
constructive algorithms
,
greedy
,
sortings
1500
x8973
1114A
Got Any Grapes?
brute force
,
greedy
,
implementation
800
x18545
1113B
Sasha and Magnetic Machines
greedy
,
number theory
1300
x7739
1113A
Sasha and His Trip
dp
,
greedy
,
math
900
x17292
1111E
Tree
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2500
x931
1111D
Destroy the Colony
combinatorics
,
dp
,
math
2600
x962
1111C
Creative Snap
binary search
,
brute force
,
divide and conquer
,
math
1700
x6254
1111B
Average Superhero Gang Power
brute force
,
implementation
,
math
1700
x6285
1111A
Superhero Transformation
implementation
,
strings
1000
x16876
1110H
Modest Substrings
dp
,
strings
3500
x282
1110G
Tree-Tac-Toe
constructive algorithms
,
games
,
trees
3100
x619
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