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Problems
#
Name
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x410
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1284
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2367
1710A
Color the Picture
constructive algorithms
,
greedy
,
math
1500
x10648
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x537
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2481
1709D
Rorororobot
binary search
,
data structures
,
greedy
,
math
1700
x8139
1709C
Recover an RBS
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x8572
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x21985
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x29141
1708B
Difference of GCDs
constructive algorithms
,
math
1100
x19693
1708A
Difference Operations
greedy
,
math
800
x21521
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x146
1707E
Replace
binary search
,
data structures
3500
x564
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x588
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1401
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x5567
1707A
Doremy's IQ
binary search
,
constructive algorithms
,
greedy
,
implementation
1600
x12956
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2409
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1660
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x6720
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x14499
1706B
Making Towers
dp
,
greedy
,
math
1100
x16265
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x22615
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x577
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1983
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6130
1705C
Mark and His Unfinished Essay
brute force
,
implementation
1400
x13039
1705B
Mark the Dust Sweeper
constructive algorithms
,
greedy
,
implementation
900
x22271
1705A
Mark the Photographer
greedy
,
sortings
800
x24854
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x77
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x172
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x99
1704F
Colouring Game
constructive algorithms
,
dp
,
games
2600
x940
1704E
Count Seconds
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
2200
x2240
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4884
1704C
Virus
greedy
,
implementation
,
sortings
1200
x14619
1704B
Luke is a Foodie
brute force
,
greedy
,
implementation
1000
x16585
1704A
Two 0-1 Sequences
constructive algorithms
,
greedy
800
x15831
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x10113
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x18463
1703E
Mirror Grid
implementation
1200
x17089
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x24573
1703C
Cypher
brute force
,
implementation
,
strings
800
x34368
1703B
ICPC Balloons
data structures
,
implementation
800
x46002
1703A
YES or YES?
brute force
,
implementation
,
strings
800
x63734
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4368
1702G1
Passable Paths (easy version)
dfs and similar
,
trees
1900
x5158
1702F
Equate Multisets
constructive algorithms
,
data structures
,
greedy
,
math
,
number theory
1700
x8007
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x12489
1702D
Not a Cheap String
greedy
1000
x23089
1702C
Train and Queries
data structures
,
greedy
1100
x21587
1702B
Polycarp Writes a String from Memory
greedy
800
x27030
1702A
Round Down the Price
constructive algorithms
800
x33637
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x892
1701E
Text Editor
brute force
,
dp
,
greedy
,
strings
2500
x1076
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5519
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x15931
1701B
Permutation
greedy
800
x19989
1701A
Grass Field
implementation
800
x25909
1700F
Puzzle
constructive algorithms
,
dp
,
greedy
2600
x855
1700E
Serega the Pirate
brute force
,
constructive algorithms
2600
x830
1700D
River Locks
binary search
,
dp
,
greedy
,
math
1900
x5866
1700C
Helping the Nature
constructive algorithms
,
data structures
,
greedy
1700
x10520
1700B
Palindromic Numbers
constructive algorithms
,
implementation
,
math
1100
x18319
1700A
Optimal Path
constructive algorithms
,
greedy
,
math
800
x22595
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1097
1699D
Almost Triple Deletions
data structures
,
dp
,
greedy
2300
x3044
1699C
The Third Problem
combinatorics
,
constructive algorithms
,
math
1700
x9457
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19238
1699A
The Third Three Number Problem
constructive algorithms
,
math
800
x23685
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x303
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x592
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1584
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x8763
1698C
3SUM Closure
brute force
,
data structures
1300
x18001
1698B
Rising Sand
constructive algorithms
,
greedy
,
implementation
800
x20677
1698A
XOR Mixup
bitmasks
,
brute force
800
x28014
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x519
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1145
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4298
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x14011
1697B
Promo
greedy
,
sortings
900
x25646
1697A
Parkway Walk
greedy
,
implementation
800
x25460
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x155
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x266
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x851
1696E
Placing Jinas
combinatorics
,
math
2000
x3865
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5218
1696C
Fishingprince Plays With Array
constructive algorithms
,
greedy
,
implementation
,
math
1400
x11338
1696B
NIT Destroys the Universe
greedy
900
x19619
1696A
NIT orz!
bitmasks
,
greedy
800
x18393
1695E
Ambiguous Dominoes
constructive algorithms
,
dfs and similar
,
graphs
2700
x426
1695D2
Tree Queries (Hard Version)
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1930
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2100
1695C
Zero Path
brute force
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x10439
1695B
Circle Game
games
,
greedy
1000
x18078
1695A
Subrectangle Guess
games
800
x16134
1694B
Paranoid String
constructive algorithms
,
greedy
1200
x18616
1694A
Creep
greedy
,
implementation
800
x22189
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Codeforces Round 950 (Div. 3)
39:48:45
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2-sat
binary search
bitmasks
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dfs and similar
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fft
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