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Codeforces Round 940 (Div. 2) and CodeCraft-23
3 days
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data structures
combine-tags-by-or
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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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Custom test
Problems
#
Name
999D
Equalize the Remainders
data structures
,
greedy
,
implementation
1900
x4128
997E
Good Subsegments
data structures
3000
x1065
995C
Leaving the Bar
brute force
,
data structures
,
geometry
,
greedy
,
math
,
sortings
2300
x1715
992E
Nastya and King-Shamans
binary search
,
data structures
2500
x1262
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x695
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3220
983E
NN country
binary search
,
data structures
,
trees
2800
x865
983D
Arkady and Rectangles
data structures
3300
x319
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2236
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8138
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x262
981G
Magic multisets
data structures
2500
x622
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x1987
980E
The Number Games
data structures
,
greedy
,
trees
2200
x1793
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1676
978F
Mentors
binary search
,
data structures
,
implementation
1500
x7983
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1324
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x124
962D
Merge Equals
data structures
,
implementation
1600
x6647
961E
Tufurama
data structures
1900
x3430
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19051
960H
Santa's Gift
data structures
,
trees
3100
x252
960F
Pathwalks
data structures
,
dp
,
graphs
2100
x2655
960B
Minimize the error
data structures
,
greedy
,
sortings
1500
x7333
958C3
Encryption (hard)
data structures
,
dp
2500
x483
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x608
954G
Castle Defense
binary search
,
data structures
,
greedy
,
two pointers
2000
x1888
946G
Almost Increasing Array
data structures
,
dp
2500
x641
940F
Machine Learning
brute force
,
data structures
2600
x2400
940E
Cashback
data structures
,
dp
,
greedy
,
math
2000
x3389
939F
Cutlet
data structures
,
dp
2400
x864
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x851
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5010
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x181
935F
Fafa and Array
data structures
,
greedy
2600
x344
932F
Escape Through Leaf
data structures
,
dp
,
geometry
2700
x2487
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x7768
930E
Coins Exhibition
data structures
,
dp
,
math
2900
x402
930D
Game with Tokens
data structures
,
games
,
implementation
2500
x392
930C
Teodor is not a liar!
data structures
,
dp
1900
x2065
926J
Segments
data structures
2100
x371
926E
Merge Equal Elements
constructive algorithms
,
data structures
1900
x908
925E
May Holidays
data structures
,
trees
2900
x350
924C
Riverside Curio
data structures
,
dp
,
greedy
1700
x3670
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4140
923B
Producing Snow
binary search
,
data structures
1600
x7166
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6165
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x5738
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x119
916E
Jamie and Tree
data structures
,
trees
2400
x1542
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x487
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2293
915E
Physical Education Lessons
data structures
,
implementation
,
sortings
2300
x3963
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1413
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1369
914D
Bash and a Tough Math Puzzle
data structures
,
number theory
1900
x5015
913D
Too Easy Problems
binary search
,
brute force
,
data structures
,
greedy
,
sortings
1800
x4490
912D
Fishes
data structures
,
graphs
,
greedy
,
probabilities
,
shortest paths
2100
x1932
911G
Mass Change Queries
data structures
2500
x2552
911E
Stack Sorting
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x2453
909D
Colorful Points
data structures
,
greedy
,
implementation
2100
x1670
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x506
903D
Almost Difference
data structures
,
math
2200
x3684
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1128
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1023
900C
Remove Extra One
brute force
,
data structures
,
math
1700
x4405
899F
Letters Removing
data structures
,
strings
2100
x1570
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2724
896E
Welcome home, Chtholly
data structures
,
dsu
3100
x1955
896C
Willem, Chtholly and Seniorious
data structures
,
probabilities
2600
x3113
895E
Eyes Closed
data structures
,
probabilities
2300
x906
894D
Ralph And His Tour in Binary Country
brute force
,
data structures
,
trees
2200
x1104
893F
Subtree Minimum Query
data structures
,
trees
2300
x1646
893D
Credit Card
data structures
,
dp
,
greedy
,
implementation
1900
x2902
891C
Envy
data structures
,
dsu
,
graphs
2300
x2205
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x3853
887D
Ratings and Reality Shows
data structures
,
two pointers
2400
x470
884D
Boxes And Balls
data structures
,
greedy
2300
x1863
883L
Berland.Taxi
data structures
2500
x226
879B
Table Tennis
data structures
,
implementation
1200
x11820
878C
Tournament
data structures
,
graphs
2700
x881
878B
Teams Formation
data structures
,
implementation
2300
x1026
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1591
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4222
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3937
875E
Delivery Club
binary search
,
data structures
,
dp
2600
x848
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1964
873E
Awards For Contestants
brute force
,
data structures
,
dp
2300
x485
870F
Paths
data structures
,
number theory
2700
x592
869E
The Untended Antiquity
data structures
,
hashing
2400
x1461
865D
Buy Low Sell High
constructive algorithms
,
data structures
,
greedy
2400
x4695
863E
Turn Off The TV
data structures
,
sortings
2000
x2933
863D
Yet Another Array Queries Problem
data structures
,
implementation
1800
x3130
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x196
862E
Mahmoud and Ehab and the function
binary search
,
data structures
,
sortings
2100
x1386
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x418
858D
Polycarp's phone book
data structures
,
implementation
,
sortings
1600
x3701
855F
Nagini
binary search
,
data structures
3100
x391
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8334
853E
Lada Malina
data structures
,
geometry
3400
x63
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