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Before contest
Codeforces Round #804 (Div. 2)
2 days
→ Filter Problems
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
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x67
1394E
Boboniu and Banknote Collection
strings
3500
x70
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x91
1098F
Ж-function
string suffix structures
,
strings
3500
x102
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x125
1110H
Modest Substrings
dp
,
strings
3500
x186
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
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x92
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x257
700E
Cool Slogans
string suffix structures
,
strings
3300
x848
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x104
1056H
Detect Robots
data structures
,
strings
3200
x119
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x174
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x176
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x182
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x330
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x450
590E
Birthday
graph matchings
,
strings
3200
x559
269E
String Theory
geometry
,
math
,
strings
3100
x88
594E
Cutting the Line
string suffix structures
,
strings
3100
x112
1205E
Expected Value Again
combinatorics
,
strings
3100
x177
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x198
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x264
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
x293
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x486
587F
Duff is Mad
data structures
,
strings
3000
x605
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x806
1431I
Cyclic Shifts
*special problem
,
strings
2900
x30
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x152
1038F
Wrap Around
dp
,
strings
2900
x225
1055F
Tree and XOR
strings
,
trees
2900
x346
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x530
17E
Palisection
strings
2900
x1061
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x235
1012D
AB-Strings
constructive algorithms
,
strings
2800
x244
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x317
1082F
Speed Dial
dp
,
strings
,
trees
2800
x322
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x326
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x416
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x500
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x502
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x509
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x633
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x992
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1312
1065G
Fibonacci Suffix
strings
2700
x189
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x263
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x383
1366G
Construct the String
data structures
,
dp
,
strings
2700
x408
477D
Dreamoon and Binary
dp
,
strings
2700
x412
616F
Expensive Strings
string suffix structures
,
strings
2700
x420
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x441
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x513
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x602
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x623
827E
Rusty String
fft
,
math
,
strings
2700
x646
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1361
177G2
Fibonacci Strings
matrices
,
strings
2600
x118
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x121
1090J
Two Prefixes
strings
2600
x244
955D
Scissors
brute force
,
strings
2600
x362
150D
Mission Impassable
dp
,
strings
2600
x369
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x393
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x613
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x624
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x662
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x690
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x704
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x715
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x792
1270F
Awesome Substrings
math
,
strings
2600
x834
1363F
Rotating Substrings
dp
,
strings
2600
x960
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x331
119D
String Transformation
hashing
,
strings
2500
x386
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x579
610E
Alphabet Permutations
data structures
,
strings
2500
x634
666C
Codeword
combinatorics
,
strings
2500
x652
607C
Marbles
hashing
,
strings
2500
x726
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x752
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x851
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x908
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x983
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x998
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1006
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1116
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1249
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1432
177G1
Fibonacci Strings
strings
2400
x114
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x576
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x675
1080E
Sonya and Matrix Beauty
strings
2400
x719
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x724
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x756
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x772
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x798
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x927
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x930
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x935
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