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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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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
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number theory
probabilities
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shortest paths
sortings
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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
x1357
316E1
Summer Homework
brute force
,
data structures
1500
x1446
254B
Jury Size
brute force
,
implementation
1500
x2126
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2418
887C
Solution for Cube
brute force
,
implementation
1500
x2831
278B
New Problem
brute force
,
strings
1500
x3415
229A
Shifts
brute force
,
two pointers
1500
x3434
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3493
1070H
BerOS File Suggestion
brute force
,
implementation
1500
x3607
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x3624
358B
Dima and Text Messages
brute force
,
strings
1500
x3674
858B
Which floor?
brute force
,
implementation
1500
x3684
425A
Sereja and Swaps
brute force
,
sortings
1500
x3804
837C
Two Seals
brute force
,
implementation
1500
x3914
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x3956
724B
Batch Sort
brute force
,
greedy
,
implementation
,
math
1500
x3958
342B
Xenia and Spies
brute force
,
greedy
,
implementation
1500
x3980
22B
Bargaining Table
brute force
,
dp
1500
x4057
846A
Curriculum Vitae
brute force
,
implementation
1500
x4149
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4246
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4518
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4615
354A
Vasya and Robot
brute force
,
greedy
,
math
1500
x5382
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x5666
18A
Triangle
brute force
,
geometry
1500
x5671
496B
Secret Combination
brute force
,
constructive algorithms
,
implementation
1500
x5793
761C
Dasha and Password
brute force
,
dp
,
implementation
1500
x5825
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x5969
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x6070
1012A
Photo of The Sky
brute force
,
implementation
,
math
,
sortings
1500
x6146
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6211
908C
New Year and Curling
brute force
,
geometry
,
implementation
,
math
1500
x6656
614A
Link/Cut Tree
brute force
,
implementation
1500
x7393
863B
Kayaking
brute force
,
greedy
,
sortings
1500
x7513
496C
Removing Columns
brute force
,
constructive algorithms
,
implementation
1500
x7547
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7583
997A
Convert to Ones
brute force
,
greedy
,
implementation
,
math
1500
x8146
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8205
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x8326
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8334
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8617
1269B
Modulo Equality
brute force
,
sortings
1500
x8881
742B
Arpa’s obvious problem and Mehrdad’s terrible solution
brute force
,
math
,
number theory
1500
x9018
1051C
Vasya and Multisets
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9118
1287B
Hyperset
brute force
,
data structures
,
implementation
1500
x9157
891A
Pride
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x9559
1659C
Line Empire
binary search
,
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9571
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x9700
1759E
The Humanoid
brute force
,
dp
,
sortings
1500
x9841
877B
Nikita and string
brute force
,
dp
1500
x9932
1313C1
Skyscrapers (easy version)
brute force
,
data structures
,
dp
,
greedy
1500
x9998
1208B
Uniqueness
binary search
,
brute force
,
implementation
,
two pointers
1500
x10047
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x10136
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x10426
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10529
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x10908
1213D1
Equalizing by Division (easy version)
brute force
,
implementation
1500
x10987
1882C
Card Game
brute force
,
greedy
1500
x11165
702B
Powers of Two
brute force
,
data structures
,
implementation
,
math
1500
x11277
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11358
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11435
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11477
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11593
1673C
Palindrome Basis
brute force
,
dp
,
math
,
number theory
1500
x11606
1299A
Anu Has a Function
brute force
,
greedy
,
math
1500
x11725
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x11793
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x11920
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x11946
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12065
1499C
Minimum Grid Path
brute force
,
data structures
,
greedy
,
math
1500
x12303
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12450
1444A
Division
brute force
,
math
,
number theory
1500
x12507
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13051
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13094
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
x13649
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14330
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14576
1272D
Remove One Element
brute force
,
dp
1500
x15729
1400C
Binary String Reconstruction
2-sat
,
brute force
,
constructive algorithms
,
greedy
1500
x16691
1487D
Pythagorean Triples
binary search
,
brute force
,
math
,
number theory
1500
x16883
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x17969
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18259
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18293
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x18964
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19169
1526C1
Potions (Easy Version)
brute force
,
data structures
,
dp
,
greedy
1500
x21039
550C
Divisibility by Eight
brute force
,
dp
,
math
1500
x27143
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x36083
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x853
838A
Binary Blocks
brute force
1400
x906
331A1
Oh Sweet Beaverette
brute force
,
implementation
1400
x1332
77A
Heroes
brute force
,
implementation
1400
x1740
1057B
DDoS
*special problem
,
brute force
1400
x1781
120D
Three Sons
brute force
1400
x1891
38C
Blinds
brute force
1400
x2076
386B
Fly, freebies, fly!
binary search
,
brute force
,
implementation
1400
x2080
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2332
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2409
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