Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
47:05:31
Register now »
*has extra registration
→ 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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x19381
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x414
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11009
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x5976
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4083
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x23138
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21365
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1402
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x20225
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x858
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4447
1481A
Space Navigation
greedy
,
strings
800
x24627
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x25385
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2237
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9278
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x29531
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1845
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x841
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17275
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x26475
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15168
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x18962
1446B
Catching Cheaters
dp
,
strings
1800
x7505
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x935
1431I
Cyclic Shifts
*special problem
,
strings
2900
x41
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6139
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19584
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5079
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x726
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12460
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4155
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1551
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2420
1409F
Subsequences of Length Two
dp
,
strings
2100
x4259
1404A
Balanced Bitstring
implementation
,
strings
1500
x14717
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x765
1400A
String Similarity
constructive algorithms
,
strings
800
x26511
1397A
Juggling Letters
greedy
,
strings
800
x28073
1394E
Boboniu and Banknote Collection
strings
3500
x125
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x343
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x366
1384A
Common Prefixes
constructive algorithms
,
greedy
,
strings
1200
x18340
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10216
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12722
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19801
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11594
1374C
Move Brackets
greedy
,
strings
1000
x43076
1369B
AccurateLee
greedy
,
implementation
,
strings
1200
x23689
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x18968
1367A
Short Substrings
implementation
,
strings
800
x54561
1366G
Construct the String
data structures
,
dp
,
strings
2700
x527
1363F
Rotating Substrings
dp
,
strings
2600
x1275
1363B
Subsequence Hate
implementation
,
strings
1400
x22809
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11801
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14165
1342B
Binary Period
constructive algorithms
,
strings
1100
x23125
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3323
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15545
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x552
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9488
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11576
1324B
Yet Another Palindrome Problem
brute force
,
strings
1100
x27365
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9442
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1189
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x10911
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x8902
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x505
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x460
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11478
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11240
1304B
Longest Palindrome
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
1100
x17382
1303E
Erase Subsequences
dp
,
strings
2200
x2532
1303A
Erasing Zeroes
implementation
,
strings
800
x30319
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x8997
1301A
Three Strings
implementation
,
strings
800
x18998
1297H
Paint the String
*special problem
,
dp
,
strings
x40
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12517
1295B
Infinite Prefixes
math
,
strings
1700
x9057
1291A
Even But Not Even
greedy
,
math
,
strings
900
x18942
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4874
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x480
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7314
1284A
New Year and Naming
implementation
,
strings
800
x17763
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2032
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x15657
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1738
1270F
Awesome Substrings
math
,
strings
2600
x1086
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8273
1267L
Lexicography
constructive algorithms
,
strings
1800
x2845
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15527
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3046
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x324
1251B
Binary Palindromes
greedy
,
strings
1400
x10711
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x18737
1243B2
Character Swap (Hard Version)
strings
1600
x6842
1243B1
Character Swap (Easy Version)
strings
1000
x14536
1238D
AB-string
binary search
,
combinatorics
,
dp
,
strings
1900
x5721
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x675
1223B
Strings Equalization
strings
1000
x14418
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x9880
←
1
2
3
4
5
6
7
→
User lists
Name