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Codeforces Round 950 (Div. 3)
30:10:17
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Difficulty:
—
brute force
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
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1685
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6295
919C
Seat Arrangements
brute force
,
implementation
1300
x8832
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x27068
919A
Supermarket
brute force
,
greedy
,
implementation
800
x15935
918A
Eleven
brute force
,
implementation
800
x16792
916A
Jamie and Alarm Snooze
brute force
,
implementation
,
math
900
x8490
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1456
914C
Travelling Salesman and Special Numbers
brute force
,
combinatorics
,
dp
1800
x3657
914A
Perfect Squares
brute force
,
implementation
,
math
900
x13832
913D
Too Easy Problems
binary search
,
brute force
,
data structures
,
greedy
,
sortings
1800
x4505
912C
Perun, Ult!
brute force
,
greedy
,
sortings
2500
x510
911D
Inversion Counting
brute force
,
math
1800
x4465
911C
Three Garlands
brute force
,
constructive algorithms
1400
x6965
911B
Two Cakes
binary search
,
brute force
,
implementation
1200
x11053
909A
Generate Login
brute force
,
greedy
,
sortings
1000
x9183
908C
New Year and Curling
brute force
,
geometry
,
implementation
,
math
1500
x6676
908B
New Year and Buggy Bot
brute force
,
implementation
1200
x7587
908A
New Year and Counting Cards
brute force
,
implementation
800
x14630
907A
Masha and Bears
brute force
,
implementation
1300
x5565
906C
Party
bitmasks
,
brute force
,
dp
,
graphs
2400
x1183
906B
Seating of Students
brute force
,
constructive algorithms
,
math
2200
x1125
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1312
900C
Remove Extra One
brute force
,
data structures
,
math
1700
x4482
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1128
898B
Proper Nutrition
brute force
,
implementation
,
number theory
1100
x9324
897B
Chtholly's request
brute force
1300
x7092
895A
Pizza Separation
brute force
,
implementation
1200
x6469
894D
Ralph And His Tour in Binary Country
brute force
,
data structures
,
trees
2200
x1108
894A
QAQ
brute force
,
dp
800
x33102
893B
Beautiful Divisors
brute force
,
implementation
1000
x11000
891A
Pride
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x9682
888A
Local Extrema
brute force
,
implementation
800
x10678
887C
Solution for Cube
brute force
,
implementation
1500
x2837
887B
Cubes for Masha
brute force
,
implementation
1300
x5546
886A
ACM ICPC
brute force
1000
x10122
883H
Palindromic Cut
brute force
,
implementation
,
strings
1800
x1568
877B
Nikita and string
brute force
,
dp
1500
x10017
875A
Classroom Watch
brute force
,
math
1200
x9502
873E
Awards For Contestants
brute force
,
data structures
,
dp
2300
x493
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1198
870A
Search for Pretty Integers
brute force
,
implementation
900
x9985
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x237
869A
The Artful Expedient
brute force
,
implementation
1100
x9368
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x894
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4538
868A
Bark to Unlock
brute force
,
implementation
,
strings
900
x8541
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x68
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x120
864B
Polycarp and Letters
brute force
,
implementation
,
strings
1000
x8908
863B
Kayaking
brute force
,
greedy
,
sortings
1500
x7662
863A
Quasi-palindrome
brute force
,
implementation
900
x9996
859B
Lazy Security Guard
brute force
,
geometry
,
math
1000
x6758
858B
Which floor?
brute force
,
implementation
1500
x3700
858A
k-rounding
brute force
,
math
,
number theory
1100
x7879
856A
Set Theory
brute force
,
constructive algorithms
1600
x1370
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8391
855A
Tom Riddle's Diary
brute force
,
implementation
,
strings
800
x20281
854A
Fraction
brute force
,
constructive algorithms
,
math
800
x13425
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x558
852A
Digits
brute force
,
implementation
,
math
2500
x380
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x382
850A
Five Dimensional Points
brute force
,
geometry
,
math
1700
x2998
849B
Tell Your World
brute force
,
geometry
1600
x3510
846C
Four Segments
brute force
,
data structures
,
dp
1800
x2619
846B
Math Show
brute force
,
greedy
1800
x2471
846A
Curriculum Vitae
brute force
,
implementation
1500
x4169
845B
Luba And The Ticket
brute force
,
greedy
,
implementation
1600
x4943
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x2157
842A
Kirill And The Game
brute force
,
two pointers
1200
x10002
841A
Generous Kefa
brute force
,
implementation
900
x12967
839E
Mother of Dragons
brute force
,
graphs
,
math
,
meet-in-the-middle
2700
x888
839B
Game of the Rows
brute force
,
greedy
,
implementation
1900
x3267
838A
Binary Blocks
brute force
1400
x911
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x744
837C
Two Seals
brute force
,
implementation
1500
x3940
837B
Flag of Berland
brute force
,
implementation
1600
x3896
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3957
833C
Ever-Hungry Krakozyabra
brute force
,
combinatorics
,
greedy
,
math
2700
x461
831C
Jury Marks
brute force
,
constructive algorithms
1700
x4394
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1188
830A
Office Keys
binary search
,
brute force
,
dp
,
greedy
,
sortings
1800
x6643
825B
Five-In-a-Row
brute force
,
implementation
1600
x4070
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x2968
822B
Crossword solving
brute force
,
implementation
,
strings
1000
x9338
821B
Okabe and Banana Trees
brute force
,
math
1300
x5649
818C
Sofa Thief
brute force
,
implementation
2000
x1215
817C
Really Big Numbers
binary search
,
brute force
,
dp
,
math
1600
x7089
816A
Karen and Morning
brute force
,
implementation
1000
x8928
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2484
815B
Karen and Test
brute force
,
combinatorics
,
constructive algorithms
,
math
2200
x1364
815A
Karen and Game
brute force
,
greedy
,
implementation
1700
x5579
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6330
813B
The Golden Age
brute force
,
math
1800
x3796
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5089
811A
Vladik and Courtesy
brute force
,
implementation
800
x11786
807B
T-Shirt Hunt
brute force
,
implementation
1300
x3528
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1259
801A
Vicious Keyboard
brute force
1100
x7220
799D
Field expansion
brute force
,
dp
,
meet-in-the-middle
2100
x1973
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