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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
41:01:47
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Difficulty:
—
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
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
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x76
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x96
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x107
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x119
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x133
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x146
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x214
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x225
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x241
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x252
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x283
1599F
Mars
hashing
2700
x299
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x313
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x314
1909G
Pumping Lemma
hashing
,
strings
3000
x316
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x320
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x321
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x340
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x343
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x361
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x366
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x381
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x397
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x399
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x418
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x426
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x431
1533D
String Searching
*special problem
,
hashing
x434
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x435
228C
Fractal Detector
dp
,
hashing
2000
x440
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x450
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x452
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x467
119D
String Transformation
hashing
,
strings
2500
x472
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x475
1045B
Space Isaac
hashing
,
number theory
2400
x486
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x493
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x502
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x505
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x508
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x520
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x522
407D
Largest Submatrix 3
dp
,
hashing
2700
x538
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x580
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x580
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x599
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x605
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x646
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x662
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x668
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x682
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x728
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x737
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x738
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x747
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x753
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x756
607C
Marbles
hashing
,
strings
2500
x776
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x782
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x798
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x806
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x841
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x845
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x856
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x856
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x863
1252F
Regular Forestation
hashing
,
trees
2400
x865
958A2
Death Stars (medium)
hashing
,
strings
2000
x873
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x895
316G1
Good Substrings
hashing
,
strings
1700
x926
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x943
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x946
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x969
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x998
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1000
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1035
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1041
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1045
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1081
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1091
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1108
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1118
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1120
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1182
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1186
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1189
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1197
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1249
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1267
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1295
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1354
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1385
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1427
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1448
869E
The Untended Antiquity
data structures
,
hashing
2400
x1463
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1488
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1499
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1521
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1535
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1552
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