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Codeforces Round 1134 (Div. 4)
3 days
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Difficulty:
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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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Problems
#
Name
24E
Berland collider
binary search
2300
x1107
24D
Broken robot
dp
,
math
,
probabilities
2400
x2912
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1493
24B
F1 Champions
implementation
1500
x2127
24A
Ring road
graphs
1400
x7584
23E
Tree
dp
2500
x787
23D
Tetragon
geometry
,
math
2600
x463
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1847
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3999
23A
You're Given a String...
brute force
,
greedy
1200
x6616
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x2259
22D
Segments
greedy
,
sortings
1900
x3586
22C
System Administrator
graphs
1700
x4016
22B
Bargaining Table
brute force
,
dp
1500
x4997
22A
Second Order Statistics
brute force
800
x28808
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x1479
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2687
21B
Intersection
implementation
,
math
2000
x1697
21A
Jabber ID
implementation
,
strings
1900
x2393
20C
Dijkstra?
graphs
,
shortest paths
1900
x51723
20B
Equation
math
2000
x5228
20A
BerOS file system
implementation
1700
x7386
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x2742
19D
Points
data structures
2800
x3516
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1428
19B
Checkout Assistant
dp
1900
x6282
19A
World Football Cup
implementation
1400
x3311
18E
Flag 2
dp
2000
x1348
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1345
18C
Stripe
data structures
,
implementation
1200
x16096
18B
Platforms
brute force
,
math
1700
x2521
18A
Triangle
brute force
,
geometry
1500
x7280
17E
Palisection
strings
2900
x2289
17D
Notepad
number theory
2400
x1421
17C
Balance
dp
2500
x1105
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x6880
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x23139
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x7193
16D
Logging
implementation
,
strings
1900
x1939
16C
Monitor
binary search
,
number theory
1800
x5642
16B
Burglar and Matches
greedy
,
implementation
,
sortings
900
x21484
16A
Flag
implementation
800
x18308
15E
Triangles
combinatorics
,
dp
2600
x718
15D
Map
data structures
,
implementation
,
sortings
2500
x1015
15C
Industrial Nim
games
2000
x3086
15B
Laser
math
1800
x1779
15A
Cottage Village
implementation
,
sortings
1200
x4684
14E
Camels
dp
1900
x2181
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x5513
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x4027
14B
Young Photographer
implementation
1000
x8600
14A
Letter
implementation
800
x13236
13E
Holes
data structures
,
dsu
2700
x8918
13D
Triangles
dp
,
geometry
2600
x804
13C
Sequence
dp
,
sortings
2200
x5836
13B
Letter A
geometry
,
implementation
2000
x1211
13A
Numbers
implementation
,
math
1000
x9867
12E
Start of the session
constructive algorithms
2100
x1624
12D
Ball
data structures
,
sortings
2400
x3215
12C
Fruits
greedy
,
implementation
,
sortings
1100
x7757
12B
Correct Solution?
implementation
,
sortings
1100
x10074
12A
Super Agent
implementation
800
x16272
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x512
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x7214
11C
How Many Squares?
implementation
2200
x762
11B
Jumping Jack
math
1600
x6004
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x16324
10E
Greedy Change
constructive algorithms
2600
x983
10D
LCIS
dp
2800
x6226
10C
Digital Root
number theory
2000
x1841
10B
Cinema Cashier
dp
,
implementation
1500
x2244
10A
Power Consumption Calculation
implementation
900
x8786
9E
Interestring graph and Apples
dfs and similar
,
dsu
,
graphs
2300
x1217
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x4767
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x14750
9B
Running Student
brute force
,
geometry
,
implementation
1200
x6500
9A
Die Roll
math
,
probabilities
800
x74055
8E
Beads
dp
,
graphs
2600
x845
8D
Two Friends
binary search
,
geometry
2600
x622
8C
Looking for Order
bitmasks
,
dp
2000
x4647
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x5262
8A
Train and Peter
strings
1200
x7102
7E
Defining Macros
dp
,
expression parsing
,
implementation
2600
x836
7D
Palindrome Degree
hashing
,
strings
2200
x4967
7C
Line
math
,
number theory
1800
x5974
7B
Memory Manager
implementation
1600
x3172
7A
Kalevitch and Chess
brute force
,
constructive algorithms
1100
x8458
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x4194
6D
Lizards and Basements 2
brute force
,
dp
2600
x2391
6C
Alice, Bob and Chocolate
greedy
,
two pointers
1200
x19580
6B
President's Office
implementation
1100
x15605
6A
Triangle
brute force
,
geometry
900
x24110
5E
Bindian Signalizing
data structures
2400
x2678
5D
Follow Traffic Rules
implementation
,
math
2100
x2066
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x19681
5B
Center Alignment
implementation
,
strings
1200
x7409
5A
Chat Servers Outgoing Traffic
implementation
1000
x11765
4D
Mysterious Present
dp
,
sortings
1700
x12819
4C
Registration System
data structures
,
hashing
,
implementation
1300
x118633
4B
Before an Exam
constructive algorithms
,
greedy
1200
x31352
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