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Codeforces Round 987 (Div. 2)
09:03:35
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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
897A
Scarborough Fair
implementation
800
x14259
895A
Pizza Separation
brute force
,
implementation
1200
x6571
894A
QAQ
brute force
,
dp
800
x34937
893B
Beautiful Divisors
brute force
,
implementation
1000
x11481
893A
Chess For Three
implementation
900
x10271
892B
Wrath
greedy
,
implementation
,
two pointers
1200
x9034
892A
Greed
greedy
,
implementation
900
x13601
888B
Buggy Robot
greedy
1000
x9798
888A
Local Extrema
brute force
,
implementation
800
x11007
887A
Div. 64
implementation
1000
x11288
886B
Vlad and Cafes
1000
x7923
886A
ACM ICPC
brute force
1000
x10334
884B
Japanese Crosswords Strike Back
implementation
1100
x6886
884A
Book Reading
implementation
800
x10497
883M
Quadcopter Competition
greedy
,
math
1100
x3600
879B
Table Tennis
data structures
,
implementation
1200
x12469
879A
Borya's Diagnosis
implementation
900
x9092
877A
Alex and broken contest
implementation
,
strings
1100
x10888
876A
Trip For Meal
math
900
x9398
875A
Classroom Watch
brute force
,
math
1200
x9644
873A
Chores
implementation
800
x8283
870B
Maximum of Maximums of Minimums
greedy
1200
x9591
870A
Search for Pretty Integers
brute force
,
implementation
900
x10201
869B
The Eternal Immortality
math
1100
x13748
869A
The Artful Expedient
brute force
,
implementation
1100
x9467
868A
Bark to Unlock
brute force
,
implementation
,
strings
900
x8718
867A
Between the Offices
implementation
800
x19361
864B
Polycarp and Letters
brute force
,
implementation
,
strings
1000
x9156
864A
Fair Game
implementation
,
sortings
1000
x11669
863A
Quasi-palindrome
brute force
,
implementation
900
x10255
862A
Mahmoud and Ehab and the MEX
greedy
,
implementation
1000
x9552
859B
Lazy Security Guard
brute force
,
geometry
,
math
1000
x7061
859A
Declined Finalists
greedy
,
implementation
800
x7744
858A
k-rounding
brute force
,
math
,
number theory
1100
x8061
855A
Tom Riddle's Diary
brute force
,
implementation
,
strings
800
x22009
854B
Maxim Buys an Apartment
constructive algorithms
,
math
1200
x8197
854A
Fraction
brute force
,
constructive algorithms
,
math
800
x13650
851A
Arpa and a research in Mexican wave
implementation
,
math
800
x9787
849A
Odds and Ends
implementation
1000
x9103
847M
Weather Tomorrow
implementation
,
math
1000
x6307
847G
University Classes
implementation
900
x6848
845A
Chess Tourney
implementation
,
sortings
1100
x7796
844A
Diversity
greedy
,
implementation
,
strings
1000
x11020
842B
Gleb And Pizza
geometry
1100
x10357
842A
Kirill And The Game
brute force
,
two pointers
1200
x10228
841B
Godsend
games
,
math
1100
x12307
841A
Generous Kefa
brute force
,
implementation
900
x13240
839A
Arya and Bran
implementation
900
x14198
837A
Text Volume
implementation
800
x9469
835B
The number on the board
greedy
1100
x11047
835A
Key races
math
800
x20332
834B
The Festive Evening
data structures
,
implementation
1100
x8823
834A
The Useless Toy
implementation
900
x8686
832A
Sasha and Sticks
games
,
math
800
x20845
831B
Keyboard Layouts
implementation
,
strings
800
x14513
831A
Unimodal Array
implementation
1000
x10299
828A
Restaurant Tables
implementation
1200
x7950
825A
Binary Protocol
implementation
1100
x7702
822B
Crossword solving
brute force
,
implementation
,
strings
1000
x9538
822A
I'm bored with life
implementation
,
math
,
number theory
800
x33369
821A
Okabe and Future Gadget Laboratory
implementation
800
x8260
820A
Mister B and Book Reading
implementation
900
x8176
818A
Diplomas and Certificates
implementation
,
math
800
x7019
817A
Treasure Hunt
implementation
,
math
,
number theory
1200
x6255
816A
Karen and Morning
brute force
,
implementation
1000
x9138
814A
An abandoned sentiment from past
constructive algorithms
,
greedy
,
implementation
,
sortings
900
x10432
813A
The Contest
implementation
1100
x5102
812A
Sagheer and Crossroads
implementation
1200
x6219
811B
Vladik and Complicated Book
implementation
,
sortings
1200
x6510
811A
Vladik and Courtesy
brute force
,
implementation
800
x11925
810A
Straight <<A>>
implementation
,
math
900
x8846
808A
Lucky Year
implementation
900
x9369
807A
Is it rated?
implementation
,
sortings
900
x20805
805B
3-palindrome
constructive algorithms
1000
x16961
805A
Fake NP
greedy
,
math
1000
x18083
804A
Find Amir
constructive algorithms
,
greedy
,
math
1000
x15510
803B
Distances to Zero
constructive algorithms
1200
x6587
802M
April Fools' Problem (easy)
greedy
,
sortings
1200
x3147
802G
Fake News (easy)
implementation
,
strings
800
x7057
801B
Valued Keys
constructive algorithms
,
greedy
,
strings
900
x10347
801A
Vicious Keyboard
brute force
1100
x7338
799A
Carrot Cakes
brute force
,
implementation
1100
x19017
798A
Mike and palindrome
brute force
,
constructive algorithms
,
strings
1000
x21846
797A
k-Factorization
implementation
,
math
,
number theory
1100
x15571
796A
Buying A House
brute force
,
implementation
800
x13058
794B
Cutting Carrot
geometry
,
math
1200
x6634
794A
Bank Robbery
brute force
,
implementation
800
x7052
793A
Oleg and shares
implementation
,
math
900
x6834
792A
New Bus Route
implementation
,
sortings
1100
x9022
791A
Bear and Big Brother
implementation
800
x198399
789A
Anastasia and pebbles
implementation
,
math
1100
x9335
787A
The Monster
brute force
,
math
,
number theory
1200
x11449
785B
Anton and Classes
greedy
,
sortings
1100
x10250
785A
Anton and Polyhedrons
implementation
,
strings
800
x90120
780A
Andryusha and Socks
implementation
800
x19806
779C
Dishonest Sellers
constructive algorithms
,
greedy
,
sortings
1200
x11870
779B
Weird Rounding
brute force
,
greedy
1100
x10360
779A
Pupils Redistribution
constructive algorithms
,
math
1000
x9329
777A
Shell Game
constructive algorithms
,
implementation
,
math
1000
x10305
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x21102
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