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Codeforces Round 945 (Div. 2)
4 days
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Difficulty:
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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
1909A
Distinct Buttons
implementation
,
math
800
x15719
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1754
1907F
Shift and Reverse
greedy
,
sortings
1800
x4388
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x8822
1907D
Jumping Through Segments
binary search
,
constructive algorithms
1400
x11993
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x18413
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x23317
1907A
Rook
implementation
800
x34147
1906M
Triangle Construction
greedy
,
math
1700
x2330
1906L
Palindromic Parentheses
constructive algorithms
2500
x433
1906K
Deck-Building Game
divide and conquer
,
math
2500
x264
1906J
Count BFS Graph
combinatorics
,
dp
2100
x636
1906I
Contingency Plan 2
graph matchings
2900
x126
1906H
Twin Friends
combinatorics
,
dp
2200
x606
1906G
Grid Game 2
games
,
number theory
2900
x145
1906F
Maximize The Value
data structures
,
sortings
2100
x938
1906E
Merge Not Sort
constructive algorithms
,
dp
1900
x1305
1906D
Spaceship Exploration
binary search
,
geometry
2800
x89
1906C
Cursed Game
interactive
3000
x161
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x455
1906A
Easy As ABC
brute force
1000
x3538
1905F
Field Should Not Be Empty
brute force
,
data structures
,
divide and conquer
2600
x456
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x855
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3506
1905C
Largest Subsequence
greedy
,
strings
1400
x11044
1905B
Begginer's Zelda
greedy
,
trees
1100
x15279
1905A
Constructive Problems
constructive algorithms
,
math
800
x21807
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x308
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x824
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3821
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x5694
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x10659
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12857
1904A
Forked!
brute force
,
implementation
900
x15910
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x557
1903E
Geo Game
greedy
,
interactive
,
math
2000
x1801
1903D2
Maximum And Queries (hard version)
bitmasks
,
divide and conquer
,
dp
,
greedy
2500
x709
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5090
1903C
Theofanis' Nightmare
constructive algorithms
,
greedy
1400
x10400
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11393
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x24254
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x896
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3761
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x3677
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x12262
1902B
Getting Points
binary search
,
brute force
,
greedy
1100
x13332
1902A
Binary Imbalance
constructive algorithms
800
x19809
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x143
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1371
1901D
Yet Another Monster Fight
binary search
,
dp
,
greedy
,
implementation
,
math
1700
x6177
1901C
Add, Divide and Floor
constructive algorithms
,
greedy
,
math
1400
x10699
1901B
Chip and Ribbon
greedy
,
math
1100
x14018
1901A
Line Trip
greedy
,
math
800
x25336
1900F
Local Deletions
binary search
,
data structures
,
implementation
2800
x260
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1833
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3713
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x10442
1900B
Laura and Operations
dp
,
math
900
x16011
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x22000
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2913
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6670
1899E
Queue Sort
greedy
,
implementation
,
sortings
1300
x13933
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12229
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x18158
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x18128
1899A
Game with Integers
games
,
math
,
number theory
800
x38058
1898F
Vova Escapes the Matrix
brute force
,
dfs and similar
,
divide and conquer
,
shortest paths
2600
x736
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2051
1898D
Absolute Beauty
greedy
,
math
1900
x4735
1898C
Colorful Grid
constructive algorithms
1700
x4920
1898B
Milena and Admirer
greedy
,
math
1500
x10485
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15075
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x87
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x78
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x308
1896F
Bracket Xoring
constructive algorithms
,
greedy
,
implementation
,
math
2600
x652
1896E
Permutation Sorting
data structures
,
sortings
2100
x2019
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5192
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x8615
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13389
1896A
Jagged Swaps
sortings
800
x18786
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x172
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x628
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1455
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5578
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x10111
1895B
Points and Minimum Distance
greedy
,
math
,
sortings
800
x19644
1895A
Treasure Chest
math
800
x23430
1894B
Two Out of Three
constructive algorithms
1000
x14722
1894A
Secret Sport
implementation
,
strings
800
x18114
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x179
1893D
Colorful Constructive
constructive algorithms
,
data structures
,
greedy
2600
x819
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2438
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8088
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x11282
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3377
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x771
1891D
Suspicious logarithms
binary search
,
brute force
,
math
1900
x3711
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11326
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x15816
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