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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
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Problems
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Name
24D
Broken robot
dp
,
math
,
probabilities
2400
x1794
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1214
24B
F1 Champions
implementation
1500
x1711
24A
Ring road
graphs
1400
x4766
23E
Tree
dp
2500
x588
23D
Tetragon
geometry
,
math
2600
x325
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1357
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3197
23A
You're Given a String...
brute force
,
greedy
1200
x5073
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1540
22D
Segments
greedy
,
sortings
1900
x2613
22C
System Administrator
graphs
1700
x2945
22B
Bargaining Table
brute force
,
dp
1500
x4075
22A
Second Order Statistics
brute force
800
x20871
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x796
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2014
21B
Intersection
implementation
,
math
2000
x1300
21A
Jabber ID
implementation
,
strings
1900
x1780
20C
Dijkstra?
graphs
,
shortest paths
1900
x29849
20B
Equation
math
2000
x3646
20A
BerOS file system
implementation
1700
x5942
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1611
19D
Points
data structures
2800
x2107
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1045
19B
Checkout Assistant
dp
1900
x4414
19A
World Football Cup
implementation
1400
x2580
18E
Flag 2
dp
2000
x1022
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1030
18C
Stripe
data structures
,
implementation
1200
x12453
18B
Platforms
brute force
,
math
1700
x2061
18A
Triangle
brute force
,
geometry
1500
x5697
17E
Palisection
strings
2900
x1506
17D
Notepad
number theory
2400
x1037
17C
Balance
dp
2500
x815
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4471
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x15067
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x4640
16D
Logging
implementation
,
strings
1900
x1512
16C
Monitor
binary search
,
number theory
1800
x4499
16B
Burglar and Matches
greedy
,
implementation
,
sortings
900
x16876
16A
Flag
implementation
800
x13576
15E
Triangles
combinatorics
,
dp
2600
x556
15D
Map
data structures
,
implementation
,
sortings
2500
x715
15C
Industrial Nim
games
2000
x2159
15B
Laser
math
1800
x1289
15A
Cottage Village
implementation
,
sortings
1200
x3605
14E
Camels
dp
1900
x1618
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4309
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3093
14B
Young Photographer
implementation
1000
x6670
14A
Letter
implementation
800
x10059
13E
Holes
data structures
,
dsu
2700
x5358
13D
Triangles
dp
,
geometry
2600
x594
13C
Sequence
dp
,
sortings
2200
x4116
13B
Letter A
geometry
,
implementation
2000
x834
13A
Numbers
implementation
,
math
1000
x7362
12E
Start of the session
constructive algorithms
2100
x1161
12D
Ball
data structures
,
sortings
2400
x2005
12C
Fruits
greedy
,
implementation
,
sortings
1100
x5765
12B
Correct Solution?
implementation
,
sortings
1100
x8005
12A
Super Agent
implementation
800
x12386
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x344
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4450
11C
How Many Squares?
implementation
2200
x588
11B
Jumping Jack
math
1600
x4320
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x12417
10E
Greedy Change
constructive algorithms
2600
x802
10D
LCIS
dp
2800
x4046
10C
Digital Root
number theory
2000
x1391
10B
Cinema Cashier
dp
,
implementation
1500
x1714
10A
Power Consumption Calculation
implementation
900
x6676
9E
Interestring graph and Apples
dfs and similar
,
dsu
,
graphs
2300
x987
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x3667
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x12369
9B
Running Student
brute force
,
geometry
,
implementation
1200
x5199
9A
Die Roll
math
,
probabilities
800
x52529
8E
Beads
dp
,
graphs
2600
x666
8D
Two Friends
binary search
,
geometry
2600
x509
8C
Looking for Order
bitmasks
,
dp
2000
x3248
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x4074
8A
Train and Peter
strings
1200
x5497
7E
Defining Macros
dp
,
expression parsing
,
implementation
2600
x688
7D
Palindrome Degree
hashing
,
strings
2200
x3511
7C
Line
math
,
number theory
1800
x4235
7B
Memory Manager
implementation
1600
x2370
7A
Kalevitch and Chess
brute force
,
constructive algorithms
1100
x6851
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x3000
6D
Lizards and Basements 2
brute force
,
dp
2600
x1811
6C
Alice, Bob and Chocolate
greedy
,
two pointers
1200
x13006
6B
President's Office
implementation
1100
x12133
6A
Triangle
brute force
,
geometry
900
x19073
5E
Bindian Signalizing
data structures
2400
x2007
5D
Follow Traffic Rules
implementation
,
math
2100
x1519
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x12660
5B
Center Alignment
implementation
,
strings
1200
x5535
5A
Chat Servers Outgoing Traffic
implementation
1000
x9249
4D
Mysterious Present
dp
,
sortings
1700
x9676
4C
Registration System
data structures
,
hashing
,
implementation
1300
x77195
4B
Before an Exam
constructive algorithms
,
greedy
1200
x23634
4A
Watermelon
brute force
,
math
800
x481670
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