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Before contest
Codeforces Round #793 (Div. 2)
12:23:13
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*has extra registration
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Difficulty:
—
strings
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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Custom test
Problems
#
Name
1431I
Cyclic Shifts
*special problem
,
strings
2900
x30
1297H
Paint the String
*special problem
,
dp
,
strings
x33
345G
Suffix Subgroup
*special problem
,
strings
2200
x43
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x67
1394E
Boboniu and Banknote Collection
strings
3500
x69
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x75
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x77
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x87
269E
String Theory
geometry
,
math
,
strings
3100
x88
1662B
Toys
greedy
,
strings
x92
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x92
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x99
1098F
Ж-function
string suffix structures
,
strings
3500
x101
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x103
594E
Cutting the Line
string suffix structures
,
strings
3100
x108
1663G
Six Characters
constructive algorithms
,
strings
x114
177G1
Fibonacci Strings
strings
2400
x114
177G2
Fibonacci Strings
matrices
,
strings
2600
x118
1056H
Detect Robots
data structures
,
strings
3200
x119
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x121
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x125
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x128
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x151
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x168
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x169
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x172
1205E
Expected Value Again
combinatorics
,
strings
3100
x173
1110H
Modest Substrings
dp
,
strings
3500
x185
1065G
Fibonacci Suffix
strings
2700
x188
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x197
1532F
Prefixes and Suffixes
*special problem
,
strings
x208
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x218
1663F
In Every Generation...
strings
x222
1038F
Wrap Around
dp
,
strings
2900
x225
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x227
1012D
AB-Strings
constructive algorithms
,
strings
2800
x236
1090J
Two Prefixes
strings
2600
x237
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x251
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x260
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x264
100D
World of Mouth
*special problem
,
strings
1500
x265
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x274
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x292
38F
Smart Boy
dp
,
games
,
strings
2100
x296
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x312
1082F
Speed Dial
dp
,
strings
,
trees
2800
x322
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x326
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x327
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x331
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x343
1055F
Tree and XOR
strings
,
trees
2900
x344
54D
Writing a Song
brute force
,
dp
,
strings
2100
x347
955D
Scissors
brute force
,
strings
2600
x362
150D
Mission Impassable
dp
,
strings
2600
x365
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x373
119D
String Transformation
hashing
,
strings
2500
x383
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x389
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x403
1366G
Construct the String
data structures
,
dp
,
strings
2700
x403
477D
Dreamoon and Binary
dp
,
strings
2700
x406
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x407
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x416
616F
Expensive Strings
string suffix structures
,
strings
2700
x420
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x429
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x438
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x447
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x472
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x476
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x494
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x498
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x504
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x512
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x517
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x523
590E
Birthday
graph matchings
,
strings
3200
x524
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x554
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x561
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x575
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x578
587F
Duff is Mad
data structures
,
strings
3000
x582
58D
Calendar
greedy
,
strings
2000
x594
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x597
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
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x607
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x616
610E
Alphabet Permutations
data structures
,
strings
2500
x630
827E
Rusty String
fft
,
math
,
strings
2700
x633
666C
Codeword
combinatorics
,
strings
2500
x645
180D
Name
greedy
,
strings
1900
x647
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x652
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x670
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x681
1662D
Evolution of Weasels
greedy
,
implementation
,
strings
x699
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x699
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x701
1080E
Sonya and Matrix Beauty
strings
2400
x713
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x718
607C
Marbles
hashing
,
strings
2500
x722
566A
Matching Names
dfs and similar
,
strings
,
trees
2300
x730
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