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Before contest
Codeforces Round 941 (Div. 1)
3 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
3 days
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→ Filter Problems
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dp
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
#
Name
1188C
Array Beauty
dp
2500
x1701
1187F
Expected Square Beauty
dp
,
math
,
probabilities
2500
x835
1187E
Tree Painting
dfs and similar
,
dp
,
trees
2100
x7387
1185G2
Playlist for Polycarp (hard version)
combinatorics
,
dp
2600
x703
1185G1
Playlist for Polycarp (easy version)
bitmasks
,
combinatorics
,
dp
2100
x2550
1183H
Subsequences (hard version)
dp
,
strings
1900
x2897
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4503
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2521
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x799
1182A
Filling Shapes
dp
,
math
1000
x29024
1181C
Flag
brute force
,
combinatorics
,
dp
,
implementation
1900
x3000
1180A
Alex and a Rhombus
dp
,
implementation
,
math
800
x24078
1179D
Fedor Runs for President
data structures
,
dp
,
trees
2700
x745
1178F2
Long Colorful Strip
dp
2600
x832
1178F1
Short Colorful Strip
combinatorics
,
dfs and similar
,
dp
2200
x1899
1178B
WOW Factor
dp
,
strings
1300
x13793
1176F
Destroy it!
dp
,
implementation
,
sortings
2100
x1734
1176C
Lose it!
dp
,
greedy
,
implementation
1300
x13821
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x428
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3174
1174E
Ehab and the Expected GCD Problem
combinatorics
,
dp
,
math
,
number theory
2500
x1347
1172C2
Nauuo and Pictures (hard version)
dp
,
probabilities
2600
x722
1172C1
Nauuo and Pictures (easy version)
dp
,
probabilities
2300
x983
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x3715
1170I
Good Subsets
*special problem
,
dp
x35
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x334
1168C
And Reachability
bitmasks
,
dp
2200
x2321
1163D
Mysterious Code
dp
,
strings
2100
x1210
1158F
Density of subarrays
dp
,
math
3500
x391
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2509
1156F
Card Bag
dp
,
math
,
probabilities
2300
x1324
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3560
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x398
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6668
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2536
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x751
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4822
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x591
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x512
1152D
Neko and Aki's Prank
dp
,
greedy
,
trees
2100
x2264
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1138
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3023
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x10657
1149D
Abandoning Roads
brute force
,
dp
,
graphs
,
greedy
3000
x661
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1858
1146H
Satanic Panic
dp
,
geometry
2900
x463
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x790
1146F
Leaf Partition
dp
,
trees
2500
x1084
1144G
Two Merged Sequences
dp
,
greedy
2400
x1734
1142D
Foreigner
dp
2800
x471
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2623
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1884
1140D
Minimum Triangulation
dp
,
greedy
,
math
1200
x12355
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x1972
1137C
Museums Tour
dp
,
graphs
,
implementation
2500
x1153
1133E
K Balanced Teams
dp
,
sortings
,
two pointers
1800
x5145
1132G
Greedy Subsequences
data structures
,
dp
,
trees
2400
x947
1132F
Clear the String
dp
2000
x7240
1132E
Knapsack
dfs and similar
,
dp
,
greedy
2300
x1397
1131G
Most Dangerous Shark
data structures
,
dp
,
two pointers
2700
x399
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1118
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3019
1129D
Isolation
data structures
,
dp
2900
x942
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x896
1120F
Secret Letters
data structures
,
dp
,
greedy
3100
x248
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1258
1120C
Compress String
dp
,
strings
2100
x1869
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x647
1119E
Pavel and Triangles
brute force
,
dp
,
fft
,
greedy
,
ternary search
1900
x4858
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x500
1117F
Crisp String
bitmasks
,
dp
2500
x513
1117D
Magic Gems
dp
,
math
,
matrices
2100
x3999
1114D
Flood Fill
dp
1900
x6509
1113A
Sasha and His Trip
dp
,
greedy
,
math
900
x16961
1111E
Tree
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2500
x840
1111D
Destroy the Colony
combinatorics
,
dp
,
math
2600
x916
1110H
Modest Substrings
dp
,
strings
3500
x272
1110D
Jongmah
dp
2200
x3255
1109D
Sasha and Interesting Fact from Graph Theory
brute force
,
combinatorics
,
dp
,
math
,
trees
2400
x1264
1109A
Sasha and a Bit of Relax
dp
,
implementation
1600
x8292
1108D
Diverse Garland
constructive algorithms
,
dp
,
greedy
1400
x14679
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x986
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x718
1107E
Vasya and Binary String
dp
2400
x2142
1107D
Compression
dp
,
implementation
,
math
,
number theory
1800
x3669
1106E
Lunar New Year and Red Envelopes
data structures
,
dp
2100
x2314
1105E
Helping Hiasat
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2200
x1586
1105C
Ayoub and Lost Array
combinatorics
,
dp
,
math
1500
x10110
1103D
Professional layer
bitmasks
,
dp
3100
x394
1102F
Elongated Matrix
binary search
,
bitmasks
,
brute force
,
dp
,
graphs
2000
x1898
1101F
Trucks and Cities
binary search
,
dp
2400
x1252
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4392
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x907
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x92
1097G
Vladislav and a Great Legend
combinatorics
,
dp
,
trees
3000
x656
1097D
Makoto and a Blackboard
dp
,
math
,
number theory
,
probabilities
2200
x2556
1097B
Petr and a Combination Lock
bitmasks
,
brute force
,
dp
1200
x26432
1096G
Lucky Tickets
divide and conquer
,
dp
,
fft
2400
x1366
1096F
Inversion Expectation
dp
,
math
,
probabilities
2300
x1563
1096E
The Top Scorer
combinatorics
,
dp
,
math
,
probabilities
2500
x859
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