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Codeforces Round 987 (Div. 2)
07:52:26
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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
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Name
1001H
Oracle for f(x) = parity of the number of 1s in x
*special problem
1200
x533
1001A
Generate plus state or minus state
*special problem
1100
x1013
1000A
Codehorses T-shirts
greedy
,
implementation
1200
x8824
999C
Alphabetic Removals
implementation
1200
x18467
999B
Reversing Encryption
implementation
900
x17660
999A
Mishka and Contest
brute force
,
implementation
800
x23148
998B
Cutting
dp
,
greedy
,
sortings
1200
x13160
998A
Balloons
constructive algorithms
,
implementation
1000
x9628
996A
Hit the Lottery
dp
,
greedy
800
x92378
994A
Fingerprints
implementation
800
x14217
992A
Nastya and an Array
implementation
,
sortings
800
x13181
991B
Getting an A
greedy
,
sortings
900
x12661
991A
If at first you don't succeed...
implementation
1000
x10641
990B
Micro-World
greedy
,
sortings
1200
x8143
990A
Commentary Boxes
implementation
,
math
1000
x10618
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x7063
989A
A Blend of Springtime
implementation
,
strings
900
x10389
988B
Substrings Sort
sortings
,
strings
1100
x18543
988A
Diverse Team
brute force
,
implementation
800
x25209
987B
High School: Become Human
math
1100
x11649
987A
Infinity Gauntlet
implementation
800
x16629
985B
Switches and Lamps
implementation
1200
x7400
985A
Chess Placing
implementation
1100
x8167
984B
Minesweeper
implementation
1100
x7372
984A
Game
sortings
800
x19522
982A
Row
brute force
,
constructive algorithms
1200
x9097
981B
Businessmen Problems
sortings
1000
x6989
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9414
980A
Links and Pearls
implementation
,
math
900
x10441
979A
Pizza, Pizza, Pizza!!!
math
1000
x13846
978C
Letters
binary search
,
implementation
,
two pointers
1000
x25871
978B
File Name
greedy
,
strings
800
x36601
978A
Remove Duplicates
implementation
800
x27322
977C
Less or Equal
sortings
1200
x35200
977B
Two-gram
implementation
,
strings
900
x39997
977A
Wrong Subtraction
implementation
800
x170666
976A
Minimum Binary Number
implementation
800
x10558
975B
Mancala
brute force
,
implementation
1100
x6870
975A
Aramic script
implementation
,
strings
900
x9327
967B
Watering System
math
,
sortings
1000
x7184
967A
Mind the Gap
implementation
1100
x4374
965A
Paper Airplanes
math
800
x9572
964A
Splits
math
800
x9711
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x21195
961A
Tetris
implementation
900
x10081
960A
Check the string
implementation
1200
x8222
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9664
959A
Mahmoud and Ehab and the even-odd game
games
,
math
800
x47788
958C1
Encryption (easy)
brute force
1200
x2909
958B1
Maximum Control (easy)
implementation
1000
x3440
955A
Feed the cat
greedy
,
math
1100
x6673
954A
Diagonal Walking
implementation
800
x10540
952A
Quirky Quantifiers
math
800
x11286
950B
Intercepted Message
greedy
,
implementation
1100
x7596
950A
Left-handers, Right-handers and Ambidexters
implementation
,
math
800
x15353
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13886
946B
Weird Subtraction Process
math
,
number theory
1100
x10900
946A
Partition
greedy
800
x16589
940A
Points on the line
brute force
,
greedy
,
sortings
1200
x8332
939B
Hamster Farm
implementation
1000
x10626
939A
Love Triangle
graphs
800
x25458
938B
Run For Your Prize
brute force
,
greedy
1100
x8877
938A
Word Correction
implementation
800
x11487
937A
Olympiad
implementation
,
sortings
800
x15247
935B
Fafa and the Gates
implementation
900
x11628
935A
Fafa and his Company
brute force
,
implementation
800
x43290
934B
A Prosperous Lot
constructive algorithms
,
implementation
1200
x8706
932A
Palindromic Supersequence
constructive algorithms
800
x10306
931B
World Cup
constructive algorithms
,
implementation
1200
x7151
931A
Friends Meeting
brute force
,
greedy
,
implementation
,
math
800
x12213
928A
Login Verification
*special problem
,
strings
1200
x3400
920B
Tea Queue
implementation
1200
x7381
920A
Water The Garden
implementation
1000
x7782
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x28350
919A
Supermarket
brute force
,
greedy
,
implementation
800
x16153
918B
Radio Station
implementation
,
strings
900
x16852
918A
Eleven
brute force
,
implementation
800
x17107
916A
Jamie and Alarm Snooze
brute force
,
implementation
,
math
900
x8612
915A
Garden
implementation
900
x14798
914B
Conan and Agasa play a Card Game
games
,
greedy
,
implementation
1200
x8633
914A
Perfect Squares
brute force
,
implementation
,
math
900
x14173
913B
Christmas Spruce
implementation
,
trees
1200
x16160
913A
Modular Exponentiation
implementation
,
math
900
x21385
912A
Tricky Alchemy
implementation
800
x13524
911B
Two Cakes
binary search
,
brute force
,
implementation
1200
x11427
911A
Nearest Minimums
implementation
1100
x11492
910A
The Way to Home
dfs and similar
,
dp
,
greedy
,
implementation
800
x12081
909A
Generate Login
brute force
,
greedy
,
sortings
1000
x9334
908B
New Year and Buggy Bot
brute force
,
implementation
1200
x7659
908A
New Year and Counting Cards
brute force
,
implementation
800
x14825
903C
Boxes Packing
greedy
1200
x18021
903B
The Modcrab
greedy
,
implementation
1200
x7766
903A
Hungry Student Problem
greedy
,
implementation
900
x14647
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x10884
902A
Visiting a Friend
greedy
,
implementation
1100
x9850
900A
Find Extra One
geometry
,
implementation
800
x13661
899B
Months and Years
implementation
1200
x5899
899A
Splitting in Teams
constructive algorithms
,
greedy
,
math
800
x10260
898B
Proper Nutrition
brute force
,
implementation
,
number theory
1100
x9606
898A
Rounding
implementation
,
math
800
x16287
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