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Codeforces Round 940 (Div. 2) and CodeCraft-23
36:33:48
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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
253D
Table with Letters - 2
brute force
,
two pointers
2000
x805
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x859
292C
Beautiful IP Addresses
brute force
2000
x929
193B
Xor
brute force
2000
x979
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1028
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1044
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1051
773B
Dynamic Problem Scoring
brute force
,
greedy
2000
x1140
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1192
818C
Sofa Thief
brute force
,
implementation
2000
x1210
379D
New Year Letter
bitmasks
,
brute force
,
dp
2000
x1480
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1515
317B
Ants
brute force
,
implementation
2000
x1542
464B
Restore Cube
brute force
,
geometry
2000
x1658
784E
Twisted Circuit
*special problem
,
brute force
,
implementation
2000
x1867
1102F
Elongated Matrix
binary search
,
bitmasks
,
brute force
,
dp
,
graphs
2000
x1896
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x1996
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x2128
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2218
1248D1
The World Is Just a Programming Task (Easy Version)
brute force
,
dp
,
greedy
,
implementation
2000
x2285
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2381
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2401
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2415
1185E
Polycarp and Snakes
brute force
,
implementation
2000
x2435
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x2461
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2556
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2706
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2711
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2742
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2822
1320C
World of Darkraft: Battle for Azathoth
brute force
,
data structures
,
sortings
2000
x2846
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2847
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x2854
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x2955
474C
Captain Marmot
brute force
,
geometry
2000
x3055
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3512
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3528
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3639
1551E
Fixed Points
binary search
,
brute force
,
dp
2000
x3663
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3693
777E
Hanoi Factory
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3851
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3916
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x3929
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3959
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x3971
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x4012
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4033
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4083
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4144
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4151
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4325
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4352
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4383
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4400
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4429
598E
Chocolate Bar
brute force
,
dp
2000
x4440
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4448
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4512
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4559
466B
Wonder Room
brute force
,
math
2000
x4584
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4691
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4805
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4914
1716D
Chip Move
brute force
,
dp
,
math
2000
x4964
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5148
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5393
1354C2
Not So Simple Polygon Embedding
binary search
,
brute force
,
geometry
,
math
2000
x5797
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x6128
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6170
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6249
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6829
1244C
The Football Season
brute force
,
math
,
number theory
2000
x7400
1311D
Three Integers
brute force
,
math
2000
x8573
1488C
Two Policemen
*special problem
,
binary search
,
brute force
,
math
1900
x397
529B
Group Photo 2 (online mirror version)
brute force
,
greedy
,
sortings
1900
x852
173C
Spiral Maximum
brute force
,
dp
1900
x955
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1266
109B
Lucky Probability
brute force
,
probabilities
1900
x1319
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1402
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1415
653C
Bear and Up-Down
brute force
,
implementation
1900
x1622
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1905
993B
Open Communication
bitmasks
,
brute force
1900
x1928
952B
A Map of the Cat
brute force
,
interactive
1900
x1976
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2069
488B
Candy Boxes
brute force
,
constructive algorithms
,
math
1900
x2075
613B
Skills
binary search
,
brute force
,
dp
,
greedy
,
sortings
,
two pointers
1900
x2170
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2237
372B
Counting Rectangles is Fun
brute force
,
divide and conquer
,
dp
1900
x2511
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2513
599D
Spongebob and Squares
brute force
,
math
1900
x2527
1147B
Chladni Figure
brute force
,
strings
1900
x2667
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2749
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x2796
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x2949
1181C
Flag
brute force
,
combinatorics
,
dp
,
implementation
1900
x3000
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3054
1163C1
Power Transmission (Easy Edition)
brute force
,
geometry
1900
x3153
839B
Game of the Rows
brute force
,
greedy
,
implementation
1900
x3255
1168B
Good Triple
brute force
,
two pointers
1900
x3302
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