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Codeforces Round 940 (Div. 2)
3 days
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Difficulty:
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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
239B
Easy Tape Programming
brute force
,
implementation
1500
x1355
316B1
EKG
brute force
,
dfs and similar
1500
x1356
316E1
Summer Homework
brute force
,
data structures
1500
x1444
254B
Jury Size
brute force
,
implementation
1500
x2125
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2417
887C
Solution for Cube
brute force
,
implementation
1500
x2830
278B
New Problem
brute force
,
strings
1500
x3414
229A
Shifts
brute force
,
two pointers
1500
x3434
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3483
1070H
BerOS File Suggestion
brute force
,
implementation
1500
x3604
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x3621
358B
Dima and Text Messages
brute force
,
strings
1500
x3673
858B
Which floor?
brute force
,
implementation
1500
x3683
425A
Sereja and Swaps
brute force
,
sortings
1500
x3803
837C
Two Seals
brute force
,
implementation
1500
x3910
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x3952
724B
Batch Sort
brute force
,
greedy
,
implementation
,
math
1500
x3954
342B
Xenia and Spies
brute force
,
greedy
,
implementation
1500
x3978
22B
Bargaining Table
brute force
,
dp
1500
x4055
846A
Curriculum Vitae
brute force
,
implementation
1500
x4147
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4244
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4516
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4614
354A
Vasya and Robot
brute force
,
greedy
,
math
1500
x5381
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x5663
18A
Triangle
brute force
,
geometry
1500
x5667
496B
Secret Combination
brute force
,
constructive algorithms
,
implementation
1500
x5788
761C
Dasha and Password
brute force
,
dp
,
implementation
1500
x5824
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x5968
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x6065
1012A
Photo of The Sky
brute force
,
implementation
,
math
,
sortings
1500
x6145
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6207
908C
New Year and Curling
brute force
,
geometry
,
implementation
,
math
1500
x6655
614A
Link/Cut Tree
brute force
,
implementation
1500
x7392
863B
Kayaking
brute force
,
greedy
,
sortings
1500
x7512
496C
Removing Columns
brute force
,
constructive algorithms
,
implementation
1500
x7545
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7580
997A
Convert to Ones
brute force
,
greedy
,
implementation
,
math
1500
x8143
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8201
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x8320
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8333
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8616
1269B
Modulo Equality
brute force
,
sortings
1500
x8878
742B
Arpa’s obvious problem and Mehrdad’s terrible solution
brute force
,
math
,
number theory
1500
x9014
1051C
Vasya and Multisets
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9115
1287B
Hyperset
brute force
,
data structures
,
implementation
1500
x9156
891A
Pride
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x9554
1659C
Line Empire
binary search
,
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9564
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x9690
1759E
The Humanoid
brute force
,
dp
,
sortings
1500
x9833
877B
Nikita and string
brute force
,
dp
1500
x9931
1313C1
Skyscrapers (easy version)
brute force
,
data structures
,
dp
,
greedy
1500
x9993
1208B
Uniqueness
binary search
,
brute force
,
implementation
,
two pointers
1500
x10044
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x10128
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x10419
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10522
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x10847
1213D1
Equalizing by Division (easy version)
brute force
,
implementation
1500
x10982
1882C
Card Game
brute force
,
greedy
1500
x11146
702B
Powers of Two
brute force
,
data structures
,
implementation
,
math
1500
x11273
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11347
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11427
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11473
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11591
1673C
Palindrome Basis
brute force
,
dp
,
math
,
number theory
1500
x11599
1299A
Anu Has a Function
brute force
,
greedy
,
math
1500
x11715
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x11790
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x11919
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x11941
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12062
1499C
Minimum Grid Path
brute force
,
data structures
,
greedy
,
math
1500
x12300
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12448
1444A
Division
brute force
,
math
,
number theory
1500
x12505
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13046
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13089
1340A
Nastya and Strange Generator
brute force
,
data structures
,
greedy
,
implementation
1500
x13131
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x13645
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14327
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14574
1272D
Remove One Element
brute force
,
dp
1500
x15726
1400C
Binary String Reconstruction
2-sat
,
brute force
,
constructive algorithms
,
greedy
1500
x16690
1487D
Pythagorean Triples
binary search
,
brute force
,
math
,
number theory
1500
x16862
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x17960
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18256
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18292
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x18958
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19163
1526C1
Potions (Easy Version)
brute force
,
data structures
,
dp
,
greedy
1500
x21025
550C
Divisibility by Eight
brute force
,
dp
,
math
1500
x27131
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x36067
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x852
838A
Binary Blocks
brute force
1400
x905
331A1
Oh Sweet Beaverette
brute force
,
implementation
1400
x1331
77A
Heroes
brute force
,
implementation
1400
x1740
1057B
DDoS
*special problem
,
brute force
1400
x1780
120D
Three Sons
brute force
1400
x1890
38C
Blinds
brute force
1400
x2075
386B
Fly, freebies, fly!
binary search
,
brute force
,
implementation
1400
x2076
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2332
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2408
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