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Problems
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Name
23E
Tree
dp
2500
x593
23D
Tetragon
geometry
,
math
2600
x327
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1368
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3223
23A
You're Given a String...
brute force
,
greedy
1200
x5115
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1561
22D
Segments
greedy
,
sortings
1900
x2638
22C
System Administrator
graphs
1700
x2978
22B
Bargaining Table
brute force
,
dp
1500
x4107
22A
Second Order Statistics
brute force
800
x21204
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x810
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2040
21B
Intersection
implementation
,
math
2000
x1312
21A
Jabber ID
implementation
,
strings
1900
x1797
20C
Dijkstra?
graphs
,
shortest paths
1900
x30859
20B
Equation
math
2000
x3704
20A
BerOS file system
implementation
1700
x6006
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1654
19D
Points
data structures
2800
x2177
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1057
19B
Checkout Assistant
dp
1900
x4495
19A
World Football Cup
implementation
1400
x2659
18E
Flag 2
dp
2000
x1028
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1037
18C
Stripe
data structures
,
implementation
1200
x12593
18B
Platforms
brute force
,
math
1700
x2079
18A
Triangle
brute force
,
geometry
1500
x5746
17E
Palisection
strings
2900
x1520
17D
Notepad
number theory
2400
x1041
17C
Balance
dp
2500
x821
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4546
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x15360
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x4742
16D
Logging
implementation
,
strings
1900
x1523
16C
Monitor
binary search
,
number theory
1800
x4574
16B
Burglar and Matches
greedy
,
implementation
,
sortings
900
x17134
16A
Flag
implementation
800
x13756
15E
Triangles
combinatorics
,
dp
2600
x561
15D
Map
data structures
,
implementation
,
sortings
2500
x727
15C
Industrial Nim
games
2000
x2174
15B
Laser
math
1800
x1308
15A
Cottage Village
implementation
,
sortings
1200
x3639
14E
Camels
dp
1900
x1625
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4344
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3229
14B
Young Photographer
implementation
1000
x6838
14A
Letter
implementation
800
x10248
13E
Holes
data structures
,
dsu
2700
x5462
13D
Triangles
dp
,
geometry
2600
x601
13C
Sequence
dp
,
sortings
2200
x4303
13B
Letter A
geometry
,
implementation
2000
x952
13A
Numbers
implementation
,
math
1000
x7540
12E
Start of the session
constructive algorithms
2100
x1169
12D
Ball
data structures
,
sortings
2400
x2142
12C
Fruits
greedy
,
implementation
,
sortings
1100
x5950
12B
Correct Solution?
implementation
,
sortings
1100
x8255
12A
Super Agent
implementation
800
x12597
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x349
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4537
11C
How Many Squares?
implementation
2200
x595
11B
Jumping Jack
math
1600
x4502
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x12716
10E
Greedy Change
constructive algorithms
2600
x809
10D
LCIS
dp
2800
x4107
10C
Digital Root
number theory
2000
x1408
10B
Cinema Cashier
dp
,
implementation
1500
x1730
10A
Power Consumption Calculation
implementation
900
x6922
9E
Interestring graph and Apples
dfs and similar
,
dsu
,
graphs
2300
x997
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x3698
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x12604
9B
Running Student
brute force
,
geometry
,
implementation
1200
x5363
9A
Die Roll
math
,
probabilities
800
x53538
8E
Beads
dp
,
graphs
2600
x669
8D
Two Friends
binary search
,
geometry
2600
x513
8C
Looking for Order
bitmasks
,
dp
2000
x3396
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x4234
8A
Train and Peter
strings
1200
x5678
7E
Defining Macros
dp
,
expression parsing
,
implementation
2600
x693
7D
Palindrome Degree
hashing
,
strings
2200
x3543
7C
Line
math
,
number theory
1800
x4414
7B
Memory Manager
implementation
1600
x2530
7A
Kalevitch and Chess
brute force
,
constructive algorithms
1100
x7038
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x3161
6D
Lizards and Basements 2
brute force
,
dp
2600
x1953
6C
Alice, Bob and Chocolate
greedy
,
two pointers
1200
x13268
6B
President's Office
implementation
1100
x12402
6A
Triangle
brute force
,
geometry
900
x19255
5E
Bindian Signalizing
data structures
2400
x2024
5D
Follow Traffic Rules
implementation
,
math
2100
x1655
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x13011
5B
Center Alignment
implementation
,
strings
1200
x5710
5A
Chat Servers Outgoing Traffic
implementation
1000
x9464
4D
Mysterious Present
dp
,
sortings
1700
x9916
4C
Registration System
data structures
,
hashing
,
implementation
1300
x78709
4B
Before an Exam
constructive algorithms
,
greedy
1200
x23973
4A
Watermelon
brute force
,
math
800
x490339
3D
Least Cost Bracket Sequence
greedy
2600
x3179
3C
Tic-tac-toe
brute force
,
games
,
implementation
1800
x7085
3B
Lorry
greedy
,
sortings
1900
x4407
3A
Shortest path of the king
greedy
,
shortest paths
1000
x18701
←
1
2
...
94
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→
→ Pay attention
Before contest
Codeforces Round 954 (Div. 3)
5 days
→ 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
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