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Before contest
Codeforces Round 1134 (Div. 4)
42:45:20
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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
communication
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
2231A
Construct an Array
constructive algorithms
800
x26528
2230F
Game on Growing Tree
binary search
,
dfs and similar
,
divide and conquer
,
dp
,
games
,
implementation
,
trees
2700
x562
2230E
Minimum Influence
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1603
2230D
Good Schedule
dp
,
greedy
1700
x5789
2230C
Arrange the Numbers in a Circle
constructive algorithms
,
implementation
,
math
1300
x12374
2230B
Digit String
greedy
,
implementation
,
math
1000
x18182
2230A
Optimal Purchase
implementation
,
math
800
x24628
2229I
The Endians
dp
,
trees
3500
x262
2229H
Wowee Binary String
combinatorics
,
dp
,
strings
3300
x309
2229G
Roadworks
binary search
,
data structures
,
dp
,
greedy
,
two pointers
3000
x403
2229F
Load Unbalancing
binary search
,
bitmasks
,
dp
,
greedy
2400
x1222
2229E
Deconstruction Tree
combinatorics
,
data structures
,
dp
,
graphs
,
trees
2100
x2179
2229D
Me When Median Problem
binary search
,
greedy
1700
x5666
2229C2
We Be Flipping (Hard Version)
constructive algorithms
,
dp
,
greedy
1400
x9227
2229C1
We Be Flipping (Easy Version)
constructive algorithms
,
greedy
900
x16750
2229B
Absolute Cinema
greedy
,
math
800
x19403
2229A
Slimes on a Line
brute force
,
greedy
,
math
800
x19428
2228F
Momoyo and the Network
binary search
,
dfs and similar
,
dfs and similar
,
divide and conquer
,
divide and conquer
,
dp
,
trees
2700
x396
2228E2
Amanojaku and Sequence (Hard Version)
combinatorics
,
data structures
,
implementation
,
math
2500
x402
2228E1
Amanojaku and Sequence (Easy Version)
combinatorics
,
math
2400
x687
2228D
Sanae, Cross and Color
binary search
,
data structures
,
implementation
1900
x3110
2228C2
Cirno and Number (Hard Version)
binary search
,
dfs and similar
,
dp
,
greedy
,
implementation
1600
x6701
2228C1
Cirno and Number (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
implementation
1500
x8609
2228B
Remilia Plays Soku
games
,
implementation
1100
x17970
2228A
Marisa Steals Reimu's Takeout
greedy
,
implementation
800
x22704
2227H
Fallen Leaves
dfs and similar
,
dp
,
dp
,
trees
,
trees
2100
x1897
2227G
Drowning
binary search
,
data structures
,
math
2000
x2448
2227F
It Just Keeps Going Sideways
binary search
,
data structures
,
data structures
,
dp
,
dp
,
greedy
,
greedy
,
math
,
math
1700
x4836
2227E
It All Went Sideways
binary search
,
data structures
,
dp
,
greedy
1400
x10663
2227D
Palindromex
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
two pointers
1200
x15380
2227C
Snowfall
constructive algorithms
,
math
800
x24221
2227B
Party Monster
greedy
800
x29446
2227A
Koshary
implementation
,
math
800
x33714
2226G
Stop Spot
implementation
,
strings
,
trees
3000
x225
2226F
Inversion Invasion
math
,
number theory
2800
x388
2226E
Mental Monumental (Hard Version)
data structures
,
greedy
,
math
,
two pointers
2300
x1186
2226D
Reserved Reversals
constructive algorithms
,
dp
,
greedy
,
math
1900
x3486
2226C
Mental Monumental (Easy Version)
binary search
,
data structures
,
greedy
,
math
,
two pointers
1500
x8786
2226B
Everything Everywhere
greedy
,
math
,
math
,
number theory
,
number theory
900
x15829
2226A
Disturbing Distribution
greedy
,
math
800
x16329
2225G
Simple Problem
brute force
,
graphs
,
greedy
,
number theory
2900
x315
2225F
String Cutting
binary search
,
brute force
,
brute force
,
greedy
,
hashing
,
string suffix structures
,
string suffix structures
,
strings
,
strings
2600
x831
2225E
Covering Points with Circles
constructive algorithms
,
geometry
,
math
2200
x1386
2225D
Exceptional Segments
bitmasks
,
brute force
,
math
1500
x8944
2225C
Red-Black Pairs
dp
,
greedy
1100
x14971
2225B
Alternating String
brute force
,
greedy
900
x18315
2225A
A Number Between Two Others
greedy
,
math
800
x22759
2224B
Zhily and Mex and Max
constructive algorithms
,
greedy
,
math
,
sortings
1200
x10087
2224A
Zhily and Array Operating
constructive algorithms
,
greedy
800
x12600
2223F
Zhily and Colorful Strings
divide and conquer
,
fft
,
math
3500
x128
2223E
Zhily and Permutation
data structures
,
divide and conquer
,
trees
3500
x89
2223D
Zhily and Cycle
graphs
,
greedy
2800
x508
2223C
Zhily and Signpost
chinese remainder theorem
,
dfs and similar
,
math
,
number theory
,
trees
2300
x1026
2223B
Zhily and Barknights
binary search
,
data structures
,
dp
,
math
,
sortings
,
two pointers
1600
x4191
2223A
Zhily and Bracket Swapping
constructive algorithms
,
greedy
1300
x8691
2222H
Counting Sort?
brute force
,
combinatorics
,
dp
3500
x166
2222G
Statistics on Tree
binary search
,
brute force
,
dfs and similar
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
,
trees
3100
x246
2222F
Building Tree
data structures
,
divide and conquer
,
dsu
,
graphs
,
graphs
,
implementation
2600
x791
2222E
Seek the Truth
binary search
,
bitmasks
,
constructive algorithms
,
interactive
2000
x2548
2222D
Permutation Construction
constructive algorithms
,
data structures
,
sortings
1800
x4409
2222C
Median Partition
dp
,
math
1500
x6757
2222B
Artistic Balance Tree
greedy
,
sortings
1100
x9523
2222A
A Wonderful Contest
brute force
,
dp
,
math
800
x12946
2220B
OIE Excursion
greedy
1200
x15620
2220A
Blocked
greedy
,
sortings
800
x22084
2219E
Weird Chessboard
constructive algorithms
,
math
3500
x174
2219D
MEX Replacement on Tree
data structures
,
implementation
,
math
,
trees
2700
x588
2219C
Coloring a Red Black Tree
dfs and similar
,
dp
,
greedy
,
math
,
probabilities
,
trees
,
trees
2300
x1575
2219B2
Unique Values (Hard version)
binary search
,
bitmasks
,
constructive algorithms
,
interactive
2000
x4050
2219B1
Unique Values (Easy version)
binary search
,
constructive algorithms
,
divide and conquer
,
interactive
,
math
1900
x4490
2219A
Grid L
brute force
,
constructive algorithms
,
math
,
number theory
1400
x11516
2218G
The 67th Iteration of "Counting is Fun"
implementation
,
math
1800
x5002
2218F
The 67th Tree Problem
constructive algorithms
,
implementation
,
trees
1500
x9883
2218E
The 67th XOR Problem
binary search
,
bitmasks
,
brute force
1200
x18750
2218D
The 67th OEIS Problem
constructive algorithms
,
greedy
,
greedy
,
greedy
,
math
,
math
,
number theory
1100
x23304
2218C
The 67th Permutation Problem
constructive algorithms
,
greedy
,
math
800
x33184
2218B
The 67th 6-7 Integer Problem
greedy
,
math
800
x44156
2218A
The 67th Integer Problem
brute force
,
games
,
implementation
,
math
800
x46967
2217H
Closer
dfs and similar
,
dp
,
trees
2800
x310
2217G
Down the Pivot
combinatorics
,
dp
,
math
,
trees
2600
x488
2217F
Interval Game
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
games
,
games
,
greedy
,
greedy
,
math
,
probabilities
2400
x985
2217E
Definitely Larger
binary search
,
constructive algorithms
,
data structures
,
graphs
,
greedy
,
sortings
2100
x2612
2217D
Flip the Bit (Hard Version)
greedy
,
implementation
,
math
1900
x3985
2217C
Grid Covering
chinese remainder theorem
,
math
,
number theory
1300
x12502
2217B
Flip the Bit (Easy Version)
greedy
,
implementation
1000
x19208
2217A
The Equalizer
math
800
x25938
2216B
THU Packing Puzzle
greedy
1300
x5867
2216A
Course Wishes
greedy
900
x6750
2215G
Maze
trees
3500
x106
2215F
Research
games
3500
x117
2215E
Star Map
constructive algorithms
,
data structures
,
geometry
,
greedy
,
sortings
2700
x252
2215D
EXPloration, EXPloitation, and Gain Some EXPerience!
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
2800
x190
2215C
Oriented Journey
bitmasks
,
brute force
,
communication
,
constructive algorithms
,
graphs
,
interactive
,
trees
2200
x963
2215B
RReeppeettiittiioonn
binary search
,
brute force
,
implementation
,
math
,
number theory
2000
x1426
2215A
Interval Mod
constructive algorithms
,
dp
,
greedy
,
math
1700
x4245
2214J
Special Problem
*special problem
,
brute force
,
games
,
interactive
x3773
2214I
You Are a Robot
*special problem
,
*special problem
x339
2214H
Double Vision
*special problem
x1845
2214G
Anomaly
*special problem
,
communication
x836
2214F
Numbers
*special problem
x1137
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