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Codeforces Round (Div. 2)
5 days
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Difficulty:
—
implementation
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
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Custom test
Problems
#
Name
40C
Berland Square
implementation
,
math
2300
x371
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x4570
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x3720
39H
Multiplication Table
implementation
1300
x3210
39G
Inverse Function
implementation
2400
x182
39F
Pacifist frogs
implementation
1300
x2025
38D
Vasya the Architect
implementation
1900
x1099
38B
Chess
brute force
,
implementation
,
math
1200
x4184
38A
Army
implementation
800
x27970
37B
Computer Game
greedy
,
implementation
1800
x1123
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x656
36C
Bowls
geometry
,
implementation
2200
x397
36B
Fractal
implementation
1600
x2100
36A
Extra-terrestrial Intelligence
implementation
1300
x3651
35B
Warehouse
implementation
1700
x1232
35A
Shell Game
implementation
1000
x7767
34E
Collisions
brute force
,
implementation
,
math
2000
x696
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4957
34A
Reconnaissance 2
implementation
800
x36088
33A
What is for dinner?
greedy
,
implementation
1200
x5151
32E
Hide-and-Seek
geometry
,
implementation
2400
x453
32D
Constellation
implementation
1600
x1546
32B
Borze
expression parsing
,
implementation
800
x83802
31D
Chocolate
dfs and similar
,
implementation
2000
x1270
31C
Schedule
implementation
1700
x2094
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4852
31A
Worms Evolution
implementation
1200
x13115
30B
Codeforces World Finals
implementation
1700
x1442
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x6882
29B
Traffic Lights
implementation
1500
x3449
28A
Bender Problem
implementation
1600
x1010
27A
Next Test
implementation
,
sortings
1200
x23748
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x1082
25B
Phone numbers
implementation
1100
x11664
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1489
24B
F1 Champions
implementation
1500
x2118
21B
Intersection
implementation
,
math
2000
x1689
21A
Jabber ID
implementation
,
strings
1900
x2358
20A
BerOS file system
implementation
1700
x7353
19A
World Football Cup
implementation
1400
x3295
18C
Stripe
data structures
,
implementation
1200
x15937
16D
Logging
implementation
,
strings
1900
x1926
16B
Burglar and Matches
greedy
,
implementation
,
sortings
900
x21401
16A
Flag
implementation
800
x18190
15D
Map
data structures
,
implementation
,
sortings
2500
x998
15A
Cottage Village
implementation
,
sortings
1200
x4659
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3984
14B
Young Photographer
implementation
1000
x8562
14A
Letter
implementation
800
x13142
13B
Letter A
geometry
,
implementation
2000
x1198
13A
Numbers
implementation
,
math
1000
x9822
12C
Fruits
greedy
,
implementation
,
sortings
1100
x7700
12B
Correct Solution?
implementation
,
sortings
1100
x10034
12A
Super Agent
implementation
800
x16199
11C
How Many Squares?
implementation
2200
x759
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x16217
10B
Cinema Cashier
dp
,
implementation
1500
x2164
10A
Power Consumption Calculation
implementation
900
x8748
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x14715
9B
Running Student
brute force
,
geometry
,
implementation
1200
x6399
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x5165
7E
Defining Macros
dp
,
expression parsing
,
implementation
2600
x831
7B
Memory Manager
implementation
1600
x3074
6B
President's Office
implementation
1100
x15427
5D
Follow Traffic Rules
implementation
,
math
2100
x2046
5B
Center Alignment
implementation
,
strings
1200
x7274
5A
Chat Servers Outgoing Traffic
implementation
1000
x11614
4C
Registration System
data structures
,
hashing
,
implementation
1300
x117515
3C
Tic-tac-toe
brute force
,
games
,
implementation
1800
x8547
2A
Winner
hashing
,
implementation
1500
x32512
1B
Spreadsheet
implementation
,
math
1600
x27466
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