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Before contest
Codeforces Round 941 (Div. 1)
19:17:14
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Before contest
Codeforces Round 941 (Div. 2)
19:17:14
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data structures
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
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combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
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interactive
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probabilities
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ternary search
trees
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Problems
#
Name
1264C
Beautiful Mirrors with queries
data structures
,
probabilities
2400
x1120
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x832
1263E
Editor
data structures
,
implementation
2100
x2554
1260F
Colored Tree
data structures
,
trees
2700
x479
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4116
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7198
1254D
Tree Queries
data structures
,
probabilities
,
trees
2700
x1128
1253E
Antenna Coverage
data structures
,
dp
,
greedy
,
sortings
2200
x2618
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1780
1252G
Performance Review
data structures
2100
x1360
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x324
1252C
Even Path
data structures
,
implementation
1600
x3619
1251E2
Voting (Hard Version)
binary search
,
data structures
,
greedy
2400
x2352
1251E1
Voting (Easy Version)
data structures
,
dp
,
greedy
2300
x2090
1250C
Trip to Saint Petersburg
data structures
2100
x1284
1249D2
Too Many Segments (hard version)
data structures
,
greedy
,
sortings
1800
x4862
1239C
Queue in the Train
data structures
,
greedy
,
implementation
2300
x1304
1238G
Adilbek and the Watering System
data structures
,
greedy
,
sortings
2700
x390
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x119
1237D
Balanced Playlist
binary search
,
data structures
,
implementation
2000
x3780
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x14635
1236E
Alice and the Unfair Game
binary search
,
data structures
,
dp
,
dsu
2500
x634
1236D
Alice and the Doll
brute force
,
data structures
,
greedy
,
implementation
2300
x1643
1234D
Distinct Characters Queries
data structures
1600
x14102
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16438
1227D2
Optimal Subsequences (Hard Version)
data structures
,
greedy
1800
x4222
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6118
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x1942
1221F
Choose a Square
binary search
,
data structures
,
sortings
2400
x973
1220F
Gardener Alex
binary search
,
data structures
2700
x657
1218F
Workout plan
data structures
,
greedy
1500
x2875
1218B
Guarding warehouses
data structures
,
geometry
3000
x68
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x539
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1639
1216F
Wi-Fi
data structures
,
dp
,
greedy
2100
x2331
1214G
Feeling Good
bitmasks
,
data structures
3200
x279
1214C
Bad Sequence
data structures
,
greedy
1200
x12810
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2327
1213B
Bad Prices
data structures
,
implementation
1100
x25582
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x135
1209G2
Into Blocks (hard version)
data structures
3200
x376
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2859
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1067
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x141
1208E
Let Them Slide
data structures
,
implementation
2200
x1956
1208D
Restore Permutation
binary search
,
data structures
,
greedy
,
implementation
1900
x4650
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x946
1207F
Remainder Problem
brute force
,
data structures
,
implementation
2100
x4714
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2971
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2351
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x909
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x3909
1200A
Hotelier
brute force
,
data structures
,
implementation
800
x19911
1198B
Welfare State
binary search
,
brute force
,
data structures
,
sortings
1600
x9154
1197E
Culture Code
binary search
,
combinatorics
,
data structures
,
dp
,
shortest paths
,
sortings
2300
x1452
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9304
1195F
Geometers Anonymous Club
data structures
,
geometry
,
math
,
sortings
2500
x693
1195E
OpenStreetMap
data structures
,
two pointers
2100
x2797
1194E
Count The Rectangles
bitmasks
,
brute force
,
data structures
,
geometry
,
sortings
2200
x1729
1193B
Magic Tree
*special problem
,
data structures
,
dp
,
trees
x416
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x995
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2208
1189C
Candies!
data structures
,
dp
,
implementation
,
math
1400
x10261
1187D
Subarray Sorting
data structures
,
sortings
2400
x2448
1185C2
Exam in BerSU (hard version)
brute force
,
data structures
,
greedy
,
math
1700
x7137
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x492
1184C2
Heidi and the Turing Test (Medium)
data structures
2200
x596
1182F
Maximum Sine
binary search
,
data structures
,
number theory
2700
x329
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4379
1181D
Irrigation
binary search
,
data structures
,
implementation
,
sortings
,
trees
,
two pointers
2200
x2018
1179D
Fedor Runs for President
data structures
,
dp
,
trees
2700
x746
1179C
Serge and Dining Room
binary search
,
data structures
,
graph matchings
,
greedy
,
implementation
,
math
,
trees
2200
x1946
1179A
Valeriy and Deque
data structures
,
implementation
1500
x10115
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x406
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x428
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1544
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3180
1175B
Catch Overflow!
data structures
,
expression parsing
,
implementation
1600
x10123
1172F
Nauuo and Bug
data structures
3300
x399
1172E
Nauuo and ODT
data structures
3300
x286
1170D
Decoding of Integer Sequences
*special problem
,
data structures
,
implementation
x413
1167F
Scalar Queries
combinatorics
,
data structures
,
math
,
sortings
2300
x1431
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2399
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x685
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20272
1163F
Indecisive Taxi Fee
data structures
,
graphs
,
shortest paths
3000
x817
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x644
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3516
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7010
1163B1
Cat Party (Easy Edition)
data structures
,
implementation
1500
x6841
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1696
1157E
Minimum Array
binary search
,
data structures
,
greedy
1700
x8136
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2741
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6672
1154E
Two Teams
data structures
,
implementation
,
sortings
1800
x6022
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3026
1149C
Tree Generator™
data structures
,
implementation
,
trees
2700
x1164
1148H
Holy Diver
data structures
3500
x238
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x822
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2649
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