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Codeforces Round 940 (Div. 2) and CodeCraft-23
3 days
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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
380C
Sereja and Brackets
data structures
,
schedules
2000
x13480
2B
The least round way
dp
,
math
2000
x10175
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x10129
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x9845
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9071
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8910
1311D
Three Integers
brute force
,
math
2000
x8568
242E
XOR on Segment
bitmasks
,
data structures
2000
x8345
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8139
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x7955
1349B
Orac and Medians
constructive algorithms
,
greedy
,
math
2000
x7678
474F
Ant colony
data structures
,
math
,
number theory
2100
x7600
1244C
The Football Season
brute force
,
math
,
number theory
2000
x7395
1187E
Tree Painting
dfs and similar
,
dp
,
trees
2100
x7361
1132F
Clear the String
dp
2000
x7234
540C
Ice Cave
dfs and similar
2000
x6978
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x6884
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6826
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x6746
1385E
Directing Edges
constructive algorithms
,
dfs and similar
,
graphs
2000
x6719
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6711
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x6650
1486D
Max Median
binary search
,
data structures
,
dp
2100
x6622
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6472
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6442
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6312
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6248
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6166
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6150
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x6124
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6108
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6059
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6027
118E
Bertown roads
dfs and similar
,
graphs
2000
x5936
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x5885
1433F
Zero Remainder Sum
dp
2100
x5817
1354C2
Not So Simple Polygon Embedding
binary search
,
brute force
,
geometry
,
math
2000
x5795
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5766
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5765
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5739
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x5738
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x5716
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5659
1268B
Domino for Young
dp
,
greedy
,
math
2000
x5602
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5485
1312E
Array Shrinking
dp
,
greedy
2100
x5459
1427C
The Hard Work of Paparazzi
dp
2000
x5457
478D
Red-Green Towers
dp
2000
x5428
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5418
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5390
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5380
1C
Ancient Berland Circus
geometry
,
math
2100
x5358
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5327
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5295
1450C1
Errich-Tac-Toe (Easy Version)
constructive algorithms
,
math
2100
x5293
1372D
Omkar and Circle
brute force
,
dp
,
games
,
greedy
2100
x5282
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5147
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5128
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5111
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5103
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5090
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5079
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5010
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5001
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x4974
1716D
Chip Move
brute force
,
dp
,
math
2000
x4963
710E
Generate a String
dfs and similar
,
dp
2000
x4955
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x4928
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4912
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4836
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4803
1343E
Weights Distributing
brute force
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x4798
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x4770
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4765
837D
Round Subset
dp
,
math
2100
x4764
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4723
319C
Kalila and Dimna in the Logging Industry
dp
,
geometry
2100
x4702
1355E
Restorer Distance
binary search
,
greedy
,
math
,
sortings
,
ternary search
2100
x4700
1296E2
String Coloring (hard version)
data structures
,
dp
2000
x4690
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4687
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4687
1207F
Remainder Problem
brute force
,
data structures
,
implementation
2100
x4687
451D
Count Good Substrings
math
2000
x4630
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x4610
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4607
1370E
Binary Subsequence Rotation
binary search
,
constructive algorithms
,
data structures
,
greedy
2100
x4604
466B
Wonder Room
brute force
,
math
2000
x4583
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4554
1536D
Omkar and Medians
data structures
,
greedy
,
implementation
2000
x4545
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4511
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4496
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4481
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4446
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4445
598E
Chocolate Bar
brute force
,
dp
2000
x4436
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4425
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4400
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4386
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4385
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4381
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