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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
—
data structures
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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Custom test
Problems
#
Name
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4230
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7553
1254D
Tree Queries
data structures
,
probabilities
,
trees
2700
x1224
1253E
Antenna Coverage
data structures
,
dp
,
greedy
,
sortings
2200
x2833
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1856
1252G
Performance Review
data structures
2100
x1423
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x343
1252C
Even Path
data structures
,
implementation
1600
x3718
1251E2
Voting (Hard Version)
binary search
,
data structures
,
greedy
2400
x2645
1251E1
Voting (Easy Version)
data structures
,
dp
,
greedy
2300
x2339
1250C
Trip to Saint Petersburg
data structures
2100
x1313
1249D2
Too Many Segments (hard version)
data structures
,
greedy
,
sortings
1800
x5244
1239C
Queue in the Train
data structures
,
greedy
,
implementation
2300
x1354
1238G
Adilbek and the Watering System
data structures
,
greedy
,
sortings
2700
x410
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x123
1237D
Balanced Playlist
binary search
,
data structures
,
implementation
2000
x4196
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x16057
1236E
Alice and the Unfair Game
binary search
,
data structures
,
dp
,
dsu
2500
x659
1236D
Alice and the Doll
brute force
,
data structures
,
greedy
,
implementation
2300
x1672
1234D
Distinct Characters Queries
data structures
1600
x15030
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16906
1227D2
Optimal Subsequences (Hard Version)
data structures
,
greedy
1800
x4336
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6402
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x2052
1221F
Choose a Square
binary search
,
data structures
,
sortings
2400
x1050
1220F
Gardener Alex
binary search
,
data structures
2700
x695
1218F
Workout plan
data structures
,
greedy
1500
x2957
1218B
Guarding warehouses
data structures
,
geometry
3000
x70
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x589
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1880
1216F
Wi-Fi
data structures
,
dp
,
greedy
2100
x2645
1214G
Feeling Good
bitmasks
,
data structures
3200
x311
1214C
Bad Sequence
data structures
,
greedy
1200
x13264
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2597
1213B
Bad Prices
data structures
,
implementation
1100
x26629
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x141
1209G2
Into Blocks (hard version)
data structures
3200
x442
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x3219
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1149
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x152
1208E
Let Them Slide
data structures
,
implementation
2200
x2034
1208D
Restore Permutation
binary search
,
data structures
,
greedy
,
implementation
1900
x4902
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x1025
1207F
Remainder Problem
brute force
,
data structures
,
implementation
2100
x5245
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x3238
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2544
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x1072
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4128
1200A
Hotelier
brute force
,
data structures
,
implementation
800
x20348
1198B
Welfare State
binary search
,
brute force
,
data structures
,
sortings
1600
x9454
1197E
Culture Code
binary search
,
combinatorics
,
data structures
,
dp
,
shortest paths
,
sortings
2300
x1677
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9725
1195F
Geometers Anonymous Club
data structures
,
geometry
,
math
,
sortings
2500
x891
1195E
OpenStreetMap
data structures
,
two pointers
2100
x3129
1194E
Count The Rectangles
bitmasks
,
brute force
,
data structures
,
geometry
,
sortings
2200
x1921
1193B
Magic Tree
*special problem
,
data structures
,
dp
,
trees
x438
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x1163
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2275
1189C
Candies!
data structures
,
dp
,
implementation
,
math
1400
x10581
1187D
Subarray Sorting
data structures
,
sortings
2400
x2622
1185C2
Exam in BerSU (hard version)
brute force
,
data structures
,
greedy
,
math
1700
x7458
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x564
1184C2
Heidi and the Turing Test (Medium)
data structures
2200
x615
1182F
Maximum Sine
binary search
,
data structures
,
number theory
2700
x341
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4421
1181D
Irrigation
binary search
,
data structures
,
implementation
,
sortings
,
trees
,
two pointers
2200
x2376
1179D
Fedor Runs for President
data structures
,
dp
,
trees
2700
x835
1179C
Serge and Dining Room
binary search
,
data structures
,
graph matchings
,
greedy
,
implementation
,
math
,
trees
2200
x2047
1179A
Valeriy and Deque
data structures
,
implementation
1500
x10530
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x442
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x490
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1858
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3579
1175B
Catch Overflow!
data structures
,
expression parsing
,
implementation
1600
x10665
1172F
Nauuo and Bug
data structures
3300
x429
1172E
Nauuo and ODT
data structures
3300
x309
1170D
Decoding of Integer Sequences
*special problem
,
data structures
,
implementation
x430
1167F
Scalar Queries
combinatorics
,
data structures
,
math
,
sortings
2300
x1634
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2663
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x703
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20928
1163F
Indecisive Taxi Fee
data structures
,
graphs
,
shortest paths
3000
x883
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x671
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3624
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7219
1163B1
Cat Party (Easy Edition)
data structures
,
implementation
1500
x6975
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1939
1157E
Minimum Array
binary search
,
data structures
,
greedy
1700
x8375
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x3016
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6919
1154E
Two Teams
data structures
,
implementation
,
sortings
1800
x6267
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3329
1149C
Tree Generator™
data structures
,
implementation
,
trees
2700
x1271
1148H
Holy Diver
data structures
3500
x257
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x893
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2980
1141F2
Same Sum Blocks (Hard)
data structures
,
greedy
1900
x4194
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x497
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1211
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9557
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