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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
35:28:58
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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
1297H
Paint the String
*special problem
,
dp
,
strings
x43
1431I
Cyclic Shifts
*special problem
,
strings
2900
x45
345G
Suffix Subgroup
*special problem
,
strings
2200
x55
1975H
378QAQ and Core
greedy
,
strings
3500
x90
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x94
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
x97
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x102
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x103
269E
String Theory
geometry
,
math
,
strings
3100
x108
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x121
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x125
1662B
Toys
greedy
,
strings
x133
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x134
1394E
Boboniu and Banknote Collection
strings
3500
x140
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x140
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x152
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x153
1056H
Detect Robots
data structures
,
strings
3200
x154
594E
Cutting the Line
string suffix structures
,
strings
3100
x158
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x169
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x170
177G1
Fibonacci Strings
strings
2400
x170
177G2
Fibonacci Strings
matrices
,
strings
2600
x178
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x187
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x199
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x204
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x209
1532F
Prefixes and Suffixes
*special problem
,
strings
x218
1098F
Ж-function
string suffix structures
,
strings
3500
x218
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x223
1738H
Palindrome Addicts
data structures
,
strings
3300
x232
1065G
Fibonacci Suffix
strings
2700
x244
1205E
Expected Value Again
combinatorics
,
strings
3100
x274
1110H
Modest Substrings
dp
,
strings
3500
x279
100D
World of Mouth
*special problem
,
strings
1500
x302
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x304
1038F
Wrap Around
dp
,
strings
2900
x317
1012D
AB-Strings
constructive algorithms
,
strings
2800
x319
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x322
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x328
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x334
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x335
1663F
In Every Generation...
*special problem
,
strings
x337
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x357
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x359
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x359
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x370
1909G
Pumping Lemma
hashing
,
strings
3000
x373
38F
Smart Boy
dp
,
games
,
strings
2100
x380
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x381
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x390
1952H
Palindrome
implementation
,
strings
x394
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x408
1082F
Speed Dial
dp
,
strings
,
trees
2800
x414
1090J
Two Prefixes
strings
2600
x423
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x424
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x436
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x437
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x446
1055F
Tree and XOR
strings
,
trees
2900
x453
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x457
955D
Scissors
brute force
,
strings
2600
x462
119D
String Transformation
hashing
,
strings
2500
x483
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x486
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x487
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x497
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x497
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x517
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x520
477D
Dreamoon and Binary
dp
,
strings
2700
x520
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x524
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x525
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x526
54D
Writing a Song
brute force
,
dp
,
strings
2100
x528
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x530
1366G
Construct the String
data structures
,
dp
,
strings
2700
x538
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x561
616F
Expensive Strings
string suffix structures
,
strings
2700
x574
150D
Mission Impassable
dp
,
strings
2600
x593
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x598
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x619
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x634
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x643
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x648
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x710
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x711
58D
Calendar
greedy
,
strings
2000
x717
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x718
180D
Name
greedy
,
strings
1900
x720
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x735
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x760
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x761
590E
Birthday
graph matchings
,
strings
3200
x765
666C
Codeword
combinatorics
,
strings
2500
x775
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x780
607C
Marbles
hashing
,
strings
2500
x784
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x788
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x804
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x807
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x828
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