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Codeforces Round 988 (Div. 3)
44:53:40
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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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Problems
#
Name
994B
Knights of a Polygonal Table
greedy
,
implementation
,
sortings
1400
x5737
993B
Open Communication
bitmasks
,
brute force
1900
x1956
993A
Two Squares
geometry
,
implementation
1600
x4160
992C
Nastya and a Wardrobe
math
1600
x4619
992B
Nastya Studies Informatics
math
,
number theory
1600
x6290
991E
Bus Number
brute force
,
combinatorics
,
math
1800
x3506
991D
Bishwock
dp
,
greedy
1500
x7195
991C
Candies
binary search
,
implementation
1500
x10516
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x3845
990C
Bracket Sequences Concatenation Problem
implementation
1500
x5924
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3817
988D
Points and Powers of Two
brute force
,
math
1800
x7334
988C
Equal Sums
implementation
,
sortings
1400
x10265
987C
Three displays
brute force
,
dp
,
implementation
1400
x13614
986B
Petr and Permutations
combinatorics
,
math
1800
x4681
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x7009
985C
Liebig's Barrels
greedy
1500
x5778
983B
XOR-pyramid
dp
1800
x5569
983A
Finite or not?
implementation
,
math
1700
x4555
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2335
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x11679
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8312
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3271
981C
Useful Decomposition
implementation
,
trees
1400
x5495
980C
Posterized
games
,
greedy
1700
x3795
980B
Marlin
constructive algorithms
1600
x4701
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6348
979B
Treasure Hunt
greedy
1800
x4434
978G
Petya's Exams
greedy
,
implementation
,
sortings
1700
x4390
978F
Mentors
binary search
,
data structures
,
implementation
1500
x8331
978E
Bus Video System
combinatorics
,
math
1400
x9598
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x8815
977F
Consecutive Subsequence
dp
1700
x19372
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x20879
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x18478
976C
Nested Segments
greedy
,
implementation
,
sortings
1500
x6992
976B
Lara Croft and the New Game
implementation
,
math
1300
x5728
975C
Valhalla Siege
binary search
1400
x9714
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x3116
965B
Battleship
implementation
1300
x4576
964B
Messages
math
1300
x4366
963A
Alternating Sum
math
,
number theory
1800
x3332
962D
Merge Equals
data structures
,
implementation
1600
x6899
962C
Make a Square
brute force
,
implementation
,
math
1400
x7865
962B
Students in Railway Carriage
constructive algorithms
,
greedy
,
implementation
1300
x7705
962A
Equator
implementation
1300
x12833
961E
Tufurama
data structures
1900
x3660
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5307
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3935
960B
Minimize the error
data structures
,
greedy
,
sortings
1500
x8130
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3443
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3101
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5789
958F2
Lightsabers (medium)
binary search
,
two pointers
1800
x1238
958F1
Lightsabers (easy)
implementation
1500
x1683
958E1
Guard Duty (easy)
brute force
,
geometry
,
greedy
,
math
1600
x1528
958D1
Hyperspace Jump (easy)
expression parsing
,
math
1400
x2076
958A1
Death Stars (easy)
implementation
1400
x1665
957A
Tritonic Iridescence
implementation
1300
x5776
955B
Not simply beatiful strings
implementation
1400
x4835
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6691
954C
Matrix Walk
implementation
1700
x3795
954B
String Typing
implementation
,
strings
1400
x7285
952D
I'm Feeling Lucky!
probabilities
1800
x2450
952C
Ravioli Sort
implementation
1600
x2910
952B
A Map of the Cat
brute force
,
interactive
1900
x2050
949C
Data Center Maintenance
dfs and similar
,
graphs
1900
x2081
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3732
949A
Zebras
greedy
1600
x5400
946D
Timetable
dp
1800
x4457
946C
String Transformation
greedy
,
strings
1300
x8897
940D
Alena And The Heater
binary search
,
implementation
1600
x3635
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5898
940B
Our Tanya is Crying Out Loud
dp
,
greedy
1400
x9035
939E
Maximize!
binary search
,
greedy
,
ternary search
,
two pointers
1800
x3141
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7352
939C
Convenient For Everybody
binary search
,
two pointers
1600
x4641
938C
Constructing Tests
binary search
,
brute force
,
constructive algorithms
1700
x3322
937B
Vile Grasshoppers
brute force
,
math
,
number theory
1400
x6917
936A
Save Energy!
binary search
,
implementation
,
math
1700
x4371
935D
Fafa and Ancient Alphabet
math
,
probabilities
1900
x2639
935C
Fifa and Fafa
geometry
1600
x4756
934A
A Compatible Pair
brute force
,
games
1400
x7005
933A
A Twisty Movement
dp
1800
x4992
932C
Permutation Cycle
brute force
,
constructive algorithms
1600
x4028
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x8177
931C
Laboratory Work
implementation
,
math
1700
x3356
930C
Teodor is not a liar!
data structures
,
dp
1900
x2134
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2681
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x7215
929C
Красивая команда
*special problem
,
combinatorics
,
math
1700
x1154
929B
Места в самолёте
*special problem
,
implementation
1300
x2045
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2499
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x813
928C
Dependency management
*special problem
,
graphs
,
implementation
1900
x888
928B
Chat
*special problem
,
dp
1400
x2540
926I
A Vital Problem
1700
x666
926G
Large Bouquets
1500
x1481
926E
Merge Equal Elements
constructive algorithms
,
data structures
1900
x931
926D
Choose Place
1600
x934
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