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Codeforces Round 944 (Div. 4)
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hashing
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
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Problems
#
Name
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1520
869E
The Untended Antiquity
data structures
,
hashing
2400
x1471
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1462
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1433
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1388
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1365
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1327
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1274
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1256
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1252
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1225
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1200
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1192
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1188
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1141
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1122
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1116
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1097
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1088
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1051
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1049
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1045
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1020
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1004
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x974
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x967
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x965
316G1
Good Substrings
hashing
,
strings
1700
x929
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x896
958A2
Death Stars (medium)
hashing
,
strings
2000
x876
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x875
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x871
1252F
Regular Forestation
hashing
,
trees
2400
x868
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x866
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x861
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x848
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x810
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x802
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x784
607C
Marbles
hashing
,
strings
2500
x779
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x768
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x761
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x761
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x755
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x737
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x729
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x686
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x673
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x671
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x654
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x613
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x610
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x594
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x582
407D
Largest Submatrix 3
dp
,
hashing
2700
x539
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x528
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x521
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x519
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x514
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x514
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x496
1045B
Space Isaac
hashing
,
number theory
2400
x491
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x476
119D
String Transformation
hashing
,
strings
2500
x473
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x470
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x454
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x453
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x442
228C
Fractal Detector
dp
,
hashing
2000
x441
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x438
1533D
String Searching
*special problem
,
hashing
x434
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x420
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x400
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x400
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x382
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x371
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x368
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x346
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x341
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x331
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x331
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x324
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x322
1909G
Pumping Lemma
hashing
,
strings
3000
x318
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x315
1599F
Mars
hashing
2700
x303
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x287
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x273
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x256
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x244
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x228
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x149
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x120
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x109
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x99
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x98
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x78
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