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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
33:28:21
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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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Problems
#
Name
827E
Rusty String
fft
,
math
,
strings
2700
x788
607C
Marbles
hashing
,
strings
2500
x777
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x771
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x770
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x764
666C
Codeword
combinatorics
,
strings
2500
x763
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x748
590E
Birthday
graph matchings
,
strings
3200
x742
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x728
58D
Calendar
greedy
,
strings
2000
x711
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x710
180D
Name
greedy
,
strings
1900
x706
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x700
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x683
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x678
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x672
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x635
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x615
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x611
150D
Mission Impassable
dp
,
strings
2600
x584
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x570
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x552
616F
Expensive Strings
string suffix structures
,
strings
2700
x550
1366G
Construct the String
data structures
,
dp
,
strings
2700
x529
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x521
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x515
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x513
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x511
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x510
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x503
54D
Writing a Song
brute force
,
dp
,
strings
2100
x503
477D
Dreamoon and Binary
dp
,
strings
2700
x498
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x488
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x479
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x475
119D
String Transformation
hashing
,
strings
2500
x473
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x464
955D
Scissors
brute force
,
strings
2600
x455
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x453
1055F
Tree and XOR
strings
,
trees
2900
x446
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x437
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x427
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x426
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x417
1090J
Two Prefixes
strings
2600
x411
1082F
Speed Dial
dp
,
strings
,
trees
2800
x405
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x400
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x388
38F
Smart Boy
dp
,
games
,
strings
2100
x374
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x368
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x358
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x346
1952H
Palindrome
implementation
,
strings
x337
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x337
1663F
In Every Generation...
*special problem
,
strings
x327
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x324
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x323
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x323
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x320
1909G
Pumping Lemma
hashing
,
strings
3000
x318
1012D
AB-Strings
constructive algorithms
,
strings
2800
x316
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x314
100D
World of Mouth
*special problem
,
strings
1500
x297
1038F
Wrap Around
dp
,
strings
2900
x291
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x286
1110H
Modest Substrings
dp
,
strings
3500
x273
1205E
Expected Value Again
combinatorics
,
strings
3100
x262
1065G
Fibonacci Suffix
strings
2700
x239
1738H
Palindrome Addicts
data structures
,
strings
3300
x227
1098F
Ж-function
string suffix structures
,
strings
3500
x217
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1532F
Prefixes and Suffixes
*special problem
,
strings
x214
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x203
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x197
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x178
177G2
Fibonacci Strings
matrices
,
strings
2600
x171
177G1
Fibonacci Strings
strings
2400
x164
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x161
594E
Cutting the Line
string suffix structures
,
strings
3100
x155
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x150
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1056H
Detect Robots
data structures
,
strings
3200
x144
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x132
1662B
Toys
greedy
,
strings
x130
1394E
Boboniu and Banknote Collection
strings
3500
x128
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x121
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x118
269E
String Theory
geometry
,
math
,
strings
3100
x107
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x97
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x96
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x92
345G
Suffix Subgroup
*special problem
,
strings
2200
x51
1431I
Cyclic Shifts
*special problem
,
strings
2900
x42
1297H
Paint the String
*special problem
,
dp
,
strings
x40
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