Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round sponsored by NEAR (Div. 1 + Div. 2)
24:11:15
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
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
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x4075
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2400
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2739
26E
Multithreading
constructive algorithms
2400
x368
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x767
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x839
25E
Test
hashing
,
strings
2200
x2301
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10754
25C
Roads in Berland
graphs
,
shortest paths
1900
x6025
24E
Berland collider
binary search
2300
x875
24D
Broken robot
dp
,
math
,
probabilities
2400
x1851
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1227
23E
Tree
dp
2500
x597
23D
Tetragon
geometry
,
math
2600
x329
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1385
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1579
22D
Segments
greedy
,
sortings
1900
x2656
22C
System Administrator
graphs
1700
x3026
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x839
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2063
21B
Intersection
implementation
,
math
2000
x1321
21A
Jabber ID
implementation
,
strings
1900
x1808
20C
Dijkstra?
graphs
,
shortest paths
1900
x31372
20B
Equation
math
2000
x3749
20A
BerOS file system
implementation
1700
x6063
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1717
19D
Points
data structures
2800
x2205
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1072
19B
Checkout Assistant
dp
1900
x4561
18E
Flag 2
dp
2000
x1035
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1044
18B
Platforms
brute force
,
math
1700
x2093
17E
Palisection
strings
2900
x1534
17D
Notepad
number theory
2400
x1049
17C
Balance
dp
2500
x829
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x4842
16D
Logging
implementation
,
strings
1900
x1534
16C
Monitor
binary search
,
number theory
1800
x4629
15E
Triangles
combinatorics
,
dp
2600
x563
15D
Map
data structures
,
implementation
,
sortings
2500
x736
15C
Industrial Nim
games
2000
x2191
15B
Laser
math
1800
x1434
14E
Camels
dp
1900
x1638
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4395
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3288
13E
Holes
data structures
,
dsu
2700
x5560
13D
Triangles
dp
,
geometry
2600
x604
13C
Sequence
dp
,
sortings
2200
x4410
13B
Letter A
geometry
,
implementation
2000
x983
12E
Start of the session
constructive algorithms
2100
x1176
12D
Ball
data structures
,
sortings
2400
x2202
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x353
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4613
11C
How Many Squares?
implementation
2200
x605
10E
Greedy Change
constructive algorithms
2600
x816
10D
LCIS
dp
2800
x4186
10C
Digital Root
number theory
2000
x1422
9E
Interestring graph and Apples
dfs and similar
,
dsu
,
graphs
2300
x1013
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x3735
8E
Beads
dp
,
graphs
2600
x673
8D
Two Friends
binary search
,
geometry
2600
x516
8C
Looking for Order
bitmasks
,
dp
2000
x3442
7E
Defining Macros
dp
,
expression parsing
,
implementation
2600
x695
7D
Palindrome Degree
hashing
,
strings
2200
x3580
7C
Line
math
,
number theory
1800
x4469
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x3203
6D
Lizards and Basements 2
brute force
,
dp
2600
x1967
5E
Bindian Signalizing
data structures
2400
x2067
5D
Follow Traffic Rules
implementation
,
math
2100
x1676
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x13241
4D
Mysterious Present
dp
,
sortings
1700
x10024
3D
Least Cost Bracket Sequence
greedy
2600
x3215
3C
Tic-tac-toe
brute force
,
games
,
implementation
1800
x7177
3B
Lorry
greedy
,
sortings
1900
x4440
2C
Commentator problem
geometry
2600
x1732
2B
The least round way
dp
,
math
2000
x10614
1C
Ancient Berland Circus
geometry
,
math
2100
x5605
←
1
2
...
53
54
55
→
User lists
Name