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Before contest
Codeforces Round 973 (Div. 2)
13:47:02
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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
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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Custom test
Problems
#
Name
22A
Second Order Statistics
brute force
800
x22005
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x872
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2106
21B
Intersection
implementation
,
math
2000
x1340
21A
Jabber ID
implementation
,
strings
1900
x1845
20C
Dijkstra?
graphs
,
shortest paths
1900
x32318
20B
Equation
math
2000
x3846
20A
BerOS file system
implementation
1700
x6164
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1815
19D
Points
data structures
2800
x2340
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1084
19B
Checkout Assistant
dp
1900
x4728
19A
World Football Cup
implementation
1400
x2735
18E
Flag 2
dp
2000
x1073
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1065
18C
Stripe
data structures
,
implementation
1200
x13053
18B
Platforms
brute force
,
math
1700
x2123
18A
Triangle
brute force
,
geometry
1500
x5982
17E
Palisection
strings
2900
x1577
17D
Notepad
number theory
2400
x1073
17C
Balance
dp
2500
x916
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4728
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x16215
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x5054
16D
Logging
implementation
,
strings
1900
x1562
16C
Monitor
binary search
,
number theory
1800
x4719
16B
Burglar and Matches
greedy
,
implementation
,
sortings
900
x17830
16A
Flag
implementation
800
x14234
15E
Triangles
combinatorics
,
dp
2600
x577
15D
Map
data structures
,
implementation
,
sortings
2500
x757
15C
Industrial Nim
games
2000
x2275
15B
Laser
math
1800
x1456
15A
Cottage Village
implementation
,
sortings
1200
x3903
14E
Camels
dp
1900
x1691
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4487
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3331
14B
Young Photographer
implementation
1000
x7050
14A
Letter
implementation
800
x10564
13E
Holes
data structures
,
dsu
2700
x5867
13D
Triangles
dp
,
geometry
2600
x656
13C
Sequence
dp
,
sortings
2200
x4563
13B
Letter A
geometry
,
implementation
2000
x992
13A
Numbers
implementation
,
math
1000
x7742
12E
Start of the session
constructive algorithms
2100
x1207
12D
Ball
data structures
,
sortings
2400
x2264
12C
Fruits
greedy
,
implementation
,
sortings
1100
x6160
12B
Correct Solution?
implementation
,
sortings
1100
x8474
12A
Super Agent
implementation
800
x12991
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x361
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4825
11C
How Many Squares?
implementation
2200
x613
11B
Jumping Jack
math
1600
x4665
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x13179
10E
Greedy Change
constructive algorithms
2600
x831
10D
LCIS
dp
2800
x4352
10C
Digital Root
number theory
2000
x1436
10B
Cinema Cashier
dp
,
implementation
1500
x1765
10A
Power Consumption Calculation
implementation
900
x7105
9E
Interestring graph and Apples
dfs and similar
,
dsu
,
graphs
2300
x1030
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x3844
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x12892
9B
Running Student
brute force
,
geometry
,
implementation
1200
x5491
9A
Die Roll
math
,
probabilities
800
x56040
8E
Beads
dp
,
graphs
2600
x685
8D
Two Friends
binary search
,
geometry
2600
x521
8C
Looking for Order
bitmasks
,
dp
2000
x3514
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x4326
8A
Train and Peter
strings
1200
x5814
7E
Defining Macros
dp
,
expression parsing
,
implementation
2600
x708
7D
Palindrome Degree
hashing
,
strings
2200
x3702
7C
Line
math
,
number theory
1800
x4589
7B
Memory Manager
implementation
1600
x2591
7A
Kalevitch and Chess
brute force
,
constructive algorithms
1100
x7185
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x3266
6D
Lizards and Basements 2
brute force
,
dp
2600
x1994
6C
Alice, Bob and Chocolate
greedy
,
two pointers
1200
x13825
6B
President's Office
implementation
1100
x12912
6A
Triangle
brute force
,
geometry
900
x19728
5E
Bindian Signalizing
data structures
2400
x2131
5D
Follow Traffic Rules
implementation
,
math
2100
x1697
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x13656
5B
Center Alignment
implementation
,
strings
1200
x5841
5A
Chat Servers Outgoing Traffic
implementation
1000
x9661
4D
Mysterious Present
dp
,
sortings
1700
x10237
4C
Registration System
data structures
,
hashing
,
implementation
1300
x82359
4B
Before an Exam
constructive algorithms
,
greedy
1200
x24721
4A
Watermelon
brute force
,
math
800
x515591
3D
Least Cost Bracket Sequence
greedy
2600
x3344
3C
Tic-tac-toe
brute force
,
games
,
implementation
1800
x7287
3B
Lorry
greedy
,
sortings
1900
x4542
3A
Shortest path of the king
greedy
,
shortest paths
1000
x19123
2C
Commentator problem
geometry
2600
x1749
2B
The least round way
dp
,
math
2000
x10804
2A
Winner
hashing
,
implementation
1500
x26194
1C
Ancient Berland Circus
geometry
,
math
2100
x5671
1B
Spreadsheet
implementation
,
math
1600
x22518
1A
Theatre Square
math
1000
x258397
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