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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
1399A
Remove Smallest
greedy
,
sortings
800
x63659
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x779
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1071
1398E
Two Types of Spells
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
2200
x2183
1398D
Colored Rectangles
dp
,
greedy
,
sortings
1800
x11073
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x24631
1398B
Substring Removal Game
games
,
greedy
,
sortings
800
x24151
1398A
Bad Triangle
geometry
,
math
800
x27103
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14417
1397A
Juggling Letters
greedy
,
strings
800
x28224
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x332
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x299
1396C
Monster Invaders
dp
,
greedy
,
implementation
2300
x2402
1396B
Stoned Game
brute force
,
constructive algorithms
,
games
,
greedy
1800
x10977
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15053
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x13610
1395B
Boboniu Plays Chess
constructive algorithms
1100
x15797
1395A
Boboniu Likes to Color Balls
brute force
,
math
1000
x23578
1394E
Boboniu and Banknote Collection
strings
3500
x138
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x812
1394C
Boboniu and String
binary search
,
geometry
,
ternary search
2600
x906
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1796
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6486
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x353
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x375
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3784
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x10302
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16331
1393A
Rainbow Dash, Fluttershy and Chess Coloring
greedy
,
math
800
x20244
1392I
Kevin and Grid
fft
,
graphs
,
math
3300
x204
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x682
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x452
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x1948
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3278
1392D
Omkar and Bed Wars
dp
,
greedy
1700
x8506
1392C
Omkar and Waterslide
greedy
,
implementation
1200
x18370
1392B
Omkar and Infinity Clock
implementation
,
math
800
x18414
1392A
Omkar and Password
greedy
,
math
800
x20262
1391E
Pairs of Pairs
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2600
x1459
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4967
1391C
Cyclic Permutations
combinatorics
,
dp
,
graphs
,
math
1500
x14615
1391B
Fix You
brute force
,
greedy
,
implementation
800
x26304
1391A
Suborrays
constructive algorithms
,
math
800
x24048
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x384
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x951
1389E
Calendar Ambiguity
math
,
number theory
2200
x3125
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x4042
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18509
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x16003
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x39045
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x400
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6154
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9405
1388B
Captain Flint and a Long Voyage
greedy
,
math
1000
x21968
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24601
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x127
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x825
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1349
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x676
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x440
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x120
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x254
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1332
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2268
1385E
Directing Edges
constructive algorithms
,
dfs and similar
,
graphs
2000
x6908
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18523
1385C
Make It Good
greedy
1200
x26317
1385B
Restore the Permutation by Merger
greedy
800
x36458
1385A
Three Pairwise Maximums
math
800
x37927
1384B2
Koa and the Beach (Hard Version)
constructive algorithms
,
dp
,
greedy
,
implementation
2200
x2473
1384B1
Koa and the Beach (Easy Version)
brute force
,
dp
,
greedy
1900
x3859
1384A
Common Prefixes
constructive algorithms
,
greedy
,
strings
1200
x18430
1383F
Special Edges
flows
,
graphs
3200
x327
1383E
Strange Operation
combinatorics
,
data structures
,
dp
2800
x757
1383D
Rearrange
brute force
,
constructive algorithms
,
graphs
,
greedy
,
sortings
2800
x659
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x564
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4787
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10271
1382B
Sequential Nim
dp
,
games
1100
x24060
1382A
Common Subsequence
brute force
800
x26124
1381E
Origami
geometry
,
math
,
sortings
3300
x102
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x455
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1396
1381B
Unmerge
dp
1800
x8539
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12811
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19919
1380G
Circular Dungeon
greedy
,
math
,
probabilities
2600
x776
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x766
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x1924
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4645
1380C
Create The Teams
brute force
,
dp
,
greedy
,
implementation
,
sortings
1400
x20047
1380B
Universal Solution
greedy
1400
x14277
1380A
Three Indices
brute force
,
data structures
900
x24019
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x473
1379F1
Chess Strikes Back (easy version)
binary search
,
data structures
2700
x578
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x406
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1063
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5448
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12525
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11634
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