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Before contest
Codeforces Round #793 (Div. 2)
02:32:33
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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
x61
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x67
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x69
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x87
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x92
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x93
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x125
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x133
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x162
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x168
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x172
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x202
1599F
Mars
hashing
2700
x215
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x227
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x227
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x264
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x274
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x292
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x296
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x297
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x306
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x317
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x326
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x327
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x352
1533D
String Searching
*special problem
,
hashing
x357
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x357
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x373
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x373
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x375
119D
String Transformation
hashing
,
strings
2500
x383
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x407
1045B
Space Isaac
hashing
,
number theory
2400
x409
228C
Fractal Detector
dp
,
hashing
2000
x411
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x416
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x429
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x432
407D
Largest Submatrix 3
dp
,
hashing
2700
x434
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x446
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x473
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x476
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x489
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x512
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x531
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x542
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x578
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x596
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x599
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x602
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x616
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x629
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x647
1252F
Regular Forestation
hashing
,
trees
2400
x649
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x656
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x670
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x675
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x678
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x701
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x702
607C
Marbles
hashing
,
strings
2500
x722
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x748
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x754
958A2
Death Stars (medium)
hashing
,
strings
2000
x757
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x763
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x767
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x768
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x807
316G1
Good Substrings
hashing
,
strings
1700
x818
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x826
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x836
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x858
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x903
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x916
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x917
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x929
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x971
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x981
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x982
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x983
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x986
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1004
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1073
869E
The Untended Antiquity
data structures
,
hashing
2400
x1098
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1109
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1112
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1119
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1203
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1223
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1291
985F
Isomorphic Strings
hashing
,
strings
2300
x1292
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1346
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1408
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1416
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1463
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1471
25E
Test
hashing
,
strings
2200
x1514
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1532
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1556
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1585
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x1591
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