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Codeforces Round (Div. 2)
44:23:00
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Difficulty:
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constructive algorithms
combine-tags-by-or
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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
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x383
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x752
1719B
Mathematical Circus
constructive algorithms
,
math
800
x18397
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x105
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x523
1717D
Madoka and The Corruption Scheme
combinatorics
,
constructive algorithms
,
greedy
,
math
1900
x4330
1717B
Madoka and Underground Competitions
constructive algorithms
,
implementation
1100
x14601
1716B
Permutation Chain
constructive algorithms
,
math
800
x21312
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x511
1715B
Beautiful Array
constructive algorithms
,
greedy
,
math
1000
x20933
1715A
Crossmarket
constructive algorithms
,
greedy
,
math
800
x23352
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x3147
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x522
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5562
1713C
Build Permutation
constructive algorithms
,
dp
,
math
1200
x17068
1713B
Optimal Reduction
constructive algorithms
,
sortings
1000
x20969
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4382
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21415
1711A
Perfect Permutation
constructive algorithms
800
x24970
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x415
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1305
1710A
Color the Picture
constructive algorithms
,
greedy
,
math
1500
x10750
1709C
Recover an RBS
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x8675
1708B
Difference of GCDs
constructive algorithms
,
math
1100
x20121
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x147
1707A
Doremy's IQ
binary search
,
constructive algorithms
,
greedy
,
implementation
1600
x13222
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1674
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x6800
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x22713
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x589
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6219
1705B
Mark the Dust Sweeper
constructive algorithms
,
greedy
,
implementation
900
x22547
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x177
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x99
1704F
Colouring Game
constructive algorithms
,
dp
,
games
2600
x949
1704E
Count Seconds
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
2200
x2257
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4952
1704A
Two 0-1 Sequences
constructive algorithms
,
greedy
800
x15898
1702F
Equate Multisets
constructive algorithms
,
data structures
,
greedy
,
math
,
number theory
1700
x8183
1702A
Round Down the Price
constructive algorithms
800
x34138
1700F
Puzzle
constructive algorithms
,
dp
,
greedy
2600
x869
1700E
Serega the Pirate
brute force
,
constructive algorithms
2600
x838
1700C
Helping the Nature
constructive algorithms
,
data structures
,
greedy
1700
x10720
1700B
Palindromic Numbers
constructive algorithms
,
implementation
,
math
1100
x18533
1700A
Optimal Path
constructive algorithms
,
greedy
,
math
800
x22720
1699C
The Third Problem
combinatorics
,
constructive algorithms
,
math
1700
x9593
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19433
1699A
The Third Three Number Problem
constructive algorithms
,
math
800
x23809
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x607
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x8959
1698B
Rising Sand
constructive algorithms
,
greedy
,
implementation
800
x20819
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x547
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1159
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4349
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x14141
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x862
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5295
1696C
Fishingprince Plays With Array
constructive algorithms
,
greedy
,
implementation
,
math
1400
x11463
1695E
Ambiguous Dominoes
constructive algorithms
,
dfs and similar
,
graphs
2700
x439
1695D2
Tree Queries (Hard Version)
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1949
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2127
1694B
Paranoid String
constructive algorithms
,
greedy
1200
x18836
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5667
1691C
Sum of Substrings
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1400
x15347
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x22123
1690A
Print a Pedestal (Codeforces logo?)
constructive algorithms
,
greedy
800
x32985
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1181
1688C
Manipulating History
constructive algorithms
,
greedy
,
strings
1700
x8040
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x18059
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x222
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3547
1685D2
Permutation Weight (Hard Version)
constructive algorithms
,
greedy
3500
x105
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x435
1685C
Bring Balance
brute force
,
constructive algorithms
,
greedy
2600
x955
1685A
Circular Local MiniMax
constructive algorithms
,
greedy
,
sortings
1100
x16763
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x236
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x596
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3099
1684D
Traps
constructive algorithms
,
greedy
,
sortings
1700
x9484
1684C
Column Swapping
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x12173
1684B
Z mod X = C
constructive algorithms
,
math
800
x20832
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x23689
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x575
1682D
Circular Spanning Tree
constructive algorithms
,
implementation
,
trees
2000
x3240
1682C
LIS or Reverse LIS?
constructive algorithms
,
greedy
,
implementation
,
math
1400
x14449
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x17920
1677C
Tokitsukaze and Two Colorful Tapes
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1900
x3498
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x6271
1674D
A-B-C Sort
constructive algorithms
,
implementation
,
sortings
1200
x16048
1674A
Number Transformation
constructive algorithms
,
math
800
x25999
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x789
1672H
Zigu Zagu
constructive algorithms
,
data structures
,
greedy
2700
x935
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x319
1672F2
Checker for Array Shuffling
constructive algorithms
,
dfs and similar
,
graphs
2800
x785
1672F1
Array Shuffling
constructive algorithms
,
graphs
,
greedy
2000
x3032
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2118
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x6142
1672C
Unequal Array
constructive algorithms
,
greedy
,
implementation
1100
x13098
1672B
I love AAAB
constructive algorithms
,
implementation
800
x15715
1671D
Insert a Progression
brute force
,
constructive algorithms
,
greedy
1600
x7511
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