Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
two pointers
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
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x60772
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x48157
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x46759
1791C
Prepend and Append
implementation
,
two pointers
800
x40908
1462A
Favorite Sequence
implementation
,
two pointers
800
x40122
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x36475
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34691
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x33085
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x32847
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32727
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x29362
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28186
1843B
Long Long
greedy
,
math
,
two pointers
800
x28123
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x27833
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27582
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x27128
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27110
1690D
Black and White Stripe
implementation
,
two pointers
1000
x27018
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x26858
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26850
580B
Kefa and Company
binary search
,
sortings
,
two pointers
1500
x25018
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24812
978C
Letters
binary search
,
implementation
,
two pointers
1000
x24475
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x24428
1968B
Prefiquence
greedy
,
two pointers
800
x23642
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x23332
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22483
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x22291
1547C
Pair Programming
greedy
,
two pointers
1100
x22053
1133C
Balanced Team
sortings
,
two pointers
1200
x21405
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x21395
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21332
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20884
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20348
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20115
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20099
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x20096
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19786
1366B
Shuffle
math
,
two pointers
1300
x19670
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19417
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19331
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19165
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19085
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x18963
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x18841
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x18508
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x18485
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18485
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18412
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x18310
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18262
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18197
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17752
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17560
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17246
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16801
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x16778
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16396
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16122
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x16074
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15904
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x15835
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15821
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x15803
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15617
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15612
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15442
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15232
1610B
Kalindrome Array
greedy
,
two pointers
1100
x14865
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14812
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x14789
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14624
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x14582
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14557
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14509
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x13980
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x13957
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x13885
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13864
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x13852
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13493
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13470
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13364
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13325
702C
Cellular Network
binary search
,
implementation
,
two pointers
1500
x13247
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13235
6C
Alice, Bob and Chocolate
greedy
,
two pointers
1200
x13061
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x13054
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x13010
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x13004
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x13000
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x12940
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12894
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12774
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12596
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12551
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12533
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x12400
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12307
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12306
←
1
2
3
...
5
6
→
User lists
Name