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Codeforces Round 952 (Div. 4)
30:09:49
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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
1551C
Interesting Story
greedy
,
sortings
,
strings
1500
x12971
1551B1
Wonderful Coloring - 1
greedy
,
strings
800
x28766
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1454
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x26047
1539B
Love Song
dp
,
implementation
,
strings
800
x23898
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2826
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x5030
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12397
1536B
Prinzessin der Verurteilung
brute force
,
constructive algorithms
,
strings
1200
x17913
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x440
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16181
1532F
Prefixes and Suffixes
*special problem
,
strings
x217
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2909
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2362
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x19591
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x422
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11114
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6045
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4120
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x23703
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21459
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1416
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x20361
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x869
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4480
1481A
Space Navigation
greedy
,
strings
800
x24697
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x25486
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2258
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9370
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x30231
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1861
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x854
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17364
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x26702
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15265
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x19046
1446B
Catching Cheaters
dp
,
strings
1800
x7602
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x956
1431I
Cyclic Shifts
*special problem
,
strings
2900
x44
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6276
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19837
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5150
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x734
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12579
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4209
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1560
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2438
1409F
Subsequences of Length Two
dp
,
strings
2100
x4292
1404A
Balanced Bitstring
implementation
,
strings
1500
x14896
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x792
1400A
String Similarity
constructive algorithms
,
strings
800
x26620
1397A
Juggling Letters
greedy
,
strings
800
x28212
1394E
Boboniu and Banknote Collection
strings
3500
x138
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x353
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x375
1384A
Common Prefixes
constructive algorithms
,
greedy
,
strings
1200
x18423
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10262
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12798
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19907
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11632
1374C
Move Brackets
greedy
,
strings
1000
x43993
1369B
AccurateLee
greedy
,
implementation
,
strings
1200
x23846
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x19148
1367A
Short Substrings
implementation
,
strings
800
x55318
1366G
Construct the String
data structures
,
dp
,
strings
2700
x534
1363F
Rotating Substrings
dp
,
strings
2600
x1285
1363B
Subsequence Hate
implementation
,
strings
1400
x23006
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11948
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14285
1342B
Binary Period
constructive algorithms
,
strings
1100
x23260
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3390
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15856
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x557
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9690
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11711
1324B
Yet Another Palindrome Problem
brute force
,
strings
1100
x27614
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9524
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1263
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x11019
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x8977
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x520
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x482
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11569
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11475
1304B
Longest Palindrome
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
1100
x17477
1303E
Erase Subsequences
dp
,
strings
2200
x2578
1303A
Erasing Zeroes
implementation
,
strings
800
x30896
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9083
1301A
Three Strings
implementation
,
strings
800
x19086
1297H
Paint the String
*special problem
,
dp
,
strings
x41
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12617
1295B
Infinite Prefixes
math
,
strings
1700
x9113
1291A
Even But Not Even
greedy
,
math
,
strings
900
x19154
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4978
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x491
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7477
1284A
New Year and Naming
implementation
,
strings
800
x17902
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2071
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x16025
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1901
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