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Codeforces Round 988 (Div. 3)
25:42:12
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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
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x3845
990C
Bracket Sequences Concatenation Problem
implementation
1500
x5924
990B
Micro-World
greedy
,
sortings
1200
x8148
990A
Commentary Boxes
implementation
,
math
1000
x10621
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x253
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x517
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3817
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x7063
989A
A Blend of Springtime
implementation
,
strings
900
x10390
988F
Rain and Umbrellas
dp
2100
x2337
988E
Divisibility by 25
brute force
,
greedy
2100
x3984
988D
Points and Powers of Two
brute force
,
math
1800
x7335
988C
Equal Sums
implementation
,
sortings
1400
x10266
988B
Substrings Sort
sortings
,
strings
1100
x18553
988A
Diverse Team
brute force
,
implementation
800
x25224
987C
Three displays
brute force
,
dp
,
implementation
1400
x13614
987B
High School: Become Human
math
1100
x11650
987A
Infinity Gauntlet
implementation
800
x16629
986F
Oppa Funcan Style Remastered
graphs
,
math
,
number theory
,
shortest paths
3300
x642
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x799
986D
Perfect Encoding
fft
,
math
3100
x332
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2465
986B
Petr and Permutations
combinatorics
,
math
1800
x4682
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x7009
985G
Team Players
combinatorics
2700
x526
985F
Isomorphic Strings
hashing
,
strings
2300
x1866
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3680
985D
Sand Fortress
binary search
,
constructive algorithms
,
math
2100
x2565
985C
Liebig's Barrels
greedy
1500
x5778
985B
Switches and Lamps
implementation
1200
x7403
985A
Chess Placing
implementation
1100
x8171
984B
Minesweeper
implementation
1100
x7378
984A
Game
sortings
800
x19524
983E
NN country
binary search
,
data structures
,
trees
2800
x947
983D
Arkady and Rectangles
data structures
3300
x394
983C
Elevator
dp
,
graphs
,
shortest paths
2400
x841
983B
XOR-pyramid
dp
1800
x5569
983A
Finite or not?
implementation
,
math
1700
x4555
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x195
982E
Billiard
geometry
,
number theory
2600
x719
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2335
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x11684
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8313
982A
Row
brute force
,
constructive algorithms
1200
x9097
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x271
981G
Magic multisets
data structures
2500
x692
981F
Round Marriage
binary search
,
graph matchings
,
greedy
2500
x786
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x2123
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3271
981C
Useful Decomposition
implementation
,
trees
1400
x5495
981B
Businessmen Problems
sortings
1000
x6990
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9415
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x197
980E
The Number Games
data structures
,
greedy
,
trees
2200
x1943
980D
Perfect Groups
dp
,
math
,
number theory
2100
x2720
980C
Posterized
games
,
greedy
1700
x3801
980B
Marlin
constructive algorithms
1600
x4701
980A
Links and Pearls
implementation
,
math
900
x10442
979E
Kuro and Topological Parity
dp
2400
x661
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1842
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6350
979B
Treasure Hunt
greedy
1800
x4434
979A
Pizza, Pizza, Pizza!!!
math
1000
x13847
978G
Petya's Exams
greedy
,
implementation
,
sortings
1700
x4391
978F
Mentors
binary search
,
data structures
,
implementation
1500
x8332
978E
Bus Video System
combinatorics
,
math
1400
x9601
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x8817
978C
Letters
binary search
,
implementation
,
two pointers
1000
x25878
978B
File Name
greedy
,
strings
800
x36611
978A
Remove Duplicates
implementation
800
x27331
977F
Consecutive Subsequence
dp
1700
x19380
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x20882
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x18480
977C
Less or Equal
sortings
1200
x35239
977B
Two-gram
implementation
,
strings
900
x40023
977A
Wrong Subtraction
implementation
800
x170766
976F
Minimal k-covering
flows
,
graphs
2500
x584
976E
Well played!
greedy
,
sortings
2100
x2406
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x688
976C
Nested Segments
greedy
,
implementation
,
sortings
1500
x6992
976B
Lara Croft and the New Game
implementation
,
math
1300
x5728
976A
Minimum Binary Number
implementation
800
x10558
975E
Hag's Khashba
geometry
2600
x310
975D
Ghosts
geometry
,
math
2000
x2221
975C
Valhalla Siege
binary search
1400
x9718
975B
Mancala
brute force
,
implementation
1100
x6870
975A
Aramic script
implementation
,
strings
900
x9327
967B
Watering System
math
,
sortings
1000
x7186
967A
Mind the Gap
implementation
1100
x4374
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1483
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x3116
965C
Greedy Arkady
math
2000
x2114
965B
Battleship
implementation
1300
x4576
965A
Paper Airplanes
math
800
x9573
964B
Messages
math
1300
x4366
964A
Splits
math
800
x9711
963E
Circles of Waiting
math
3100
x551
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x2066
963C
Cutting Rectangle
brute force
,
math
,
number theory
2600
x592
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2843
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