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Before contest
Codeforces Round (Div. 3)
7 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
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2561
1167D
Bicolored RBS
constructive algorithms
,
greedy
1500
x6854
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x17375
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x10870
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x18904
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x688
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2794
1166D
Cute Sequences
binary search
,
brute force
,
greedy
,
math
2200
x2139
1166C
A Tale of Two Lands
binary search
,
sortings
,
two pointers
1500
x9225
1166B
All the Vowels Please
constructive algorithms
,
math
,
number theory
1100
x11300
1166A
Silent Classroom
combinatorics
,
greedy
900
x14029
1165F2
Microtransactions (hard version)
binary search
,
greedy
,
implementation
2000
x2069
1165F1
Microtransactions (easy version)
binary search
,
greedy
2000
x1793
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x8043
1165D
Almost All Divisors
math
,
number theory
1600
x15415
1165C
Good String
greedy
1300
x12731
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20480
1165A
Remainder
implementation
,
math
1100
x13617
1163F
Indecisive Taxi Fee
data structures
,
graphs
,
shortest paths
3000
x829
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x649
1163D
Mysterious Code
dp
,
strings
2100
x1225
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3544
1163C1
Power Transmission (Easy Edition)
brute force
,
geometry
1900
x3272
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7116
1163B1
Cat Party (Easy Edition)
data structures
,
implementation
1500
x6898
1163A
Eating Soup
greedy
,
math
900
x12800
1162B
Double Matrix
brute force
,
greedy
1400
x5777
1162A
Zoning Restrictions Again
implementation
800
x8186
1160A2
Collaboration
*special problem
1159B
Expansion coefficient of the array
implementation
,
math
1300
x7009
1159A
A pile of stones
implementation
,
math
800
x12408
1158F
Density of subarrays
dp
,
math
3500
x395
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x149
1158D
Winding polygonal line
constructive algorithms
,
geometry
,
greedy
,
math
2600
x665
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1753
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2205
1158A
The Party and Sweets
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
1500
x6912
1157G
Inverse of Rows and Columns
brute force
,
constructive algorithms
2200
x892
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2563
1157E
Minimum Array
binary search
,
data structures
,
greedy
1700
x8221
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x3645
1157C2
Increasing Subsequence (hard version)
greedy
1700
x7831
1157C1
Increasing Subsequence (easy version)
greedy
1300
x12435
1157B
Long Number
greedy
1300
x14481
1157A
Reachable Numbers
implementation
1100
x15463
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x125
1156F
Card Bag
dp
,
math
,
probabilities
2300
x1346
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2810
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3734
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5928
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6152
1156A
Inscribed Figures
geometry
1400
x8130
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x405
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1397
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6748
1155C
Alarm Clocks Everywhere
math
,
number theory
1300
x9098
1155B
Game with Telephone Numbers
games
,
greedy
,
implementation
1200
x11758
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x13889
1154G
Minimum Possible LCM
brute force
,
greedy
,
math
,
number theory
2200
x2651
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2639
1154E
Two Teams
data structures
,
implementation
,
sortings
1800
x6119
1154D
Walking Robot
greedy
1500
x9824
1154C
Gourmet Cat
implementation
,
math
1400
x10284
1154B
Make Them Equal
math
1200
x16371
1154A
Restoring Three Numbers
math
800
x67451
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x765
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1455
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4861
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7336
1153B
Serval and Toy Bricks
constructive algorithms
,
greedy
1200
x8990
1153A
Serval and Bus
brute force
,
math
1000
x11358
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x611
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x529
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x942
1152D
Neko and Aki's Prank
dp
,
greedy
,
trees
2100
x2380
1152C
Neko does Maths
brute force
,
math
,
number theory
1800
x6543
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8831
1152A
Neko Finds Grapes
greedy
,
implementation
,
math
800
x15013
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1151
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3107
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8244
1151C
Problem for Nazar
constructive algorithms
,
math
1800
x5283
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x10803
1151A
Maxim and Biology
brute force
,
strings
1000
x11045
1150B
Tiling Challenge
greedy
,
implementation
900
x10828
1150A
Stock Arbitraging
greedy
,
implementation
800
x11649
1149E
Election Promises
games
,
graphs
3200
x486
1149D
Abandoning Roads
brute force
,
dp
,
graphs
,
greedy
3000
x707
1149C
Tree Generator™
data structures
,
implementation
,
trees
2700
x1183
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1876
1149A
Prefix Sum Primes
constructive algorithms
,
greedy
,
math
,
number theory
1200
x14847
1148H
Holy Diver
data structures
3500
x249
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x316
1148F
Foo Fighters
bitmasks
,
constructive algorithms
2700
x977
1148E
Earth Wind and Fire
constructive algorithms
,
greedy
,
math
,
sortings
,
two pointers
2300
x1656
1148D
Dirty Deeds Done Dirt Cheap
greedy
,
sortings
1800
x4886
1148C
Crazy Diamond
constructive algorithms
,
sortings
1700
x5235
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7307
1148A
Another One Bites The Dust
greedy
800
x14763
1147F
Zigzag Game
games
,
interactive
3500
x241
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