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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
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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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Custom test
Problems
#
Name
39F
Pacifist frogs
implementation
1300
x1543
39E
What Has Dirichlet Got to Do with That?
dp
,
games
2000
x871
39D
Cubical Planet
math
1100
x3910
39C
Moon Craters
dp
,
sortings
2100
x598
39B
Company Income Growth
greedy
1300
x2630
39A
C*++ Calculations
expression parsing
,
greedy
2000
x675
38H
The Great Marathon
dp
2400
x285
38G
Queue
data structures
2300
x701
38F
Smart Boy
dp
,
games
,
strings
2100
x385
38E
Let's Go Rolling!
dp
,
sortings
1800
x2564
38D
Vasya the Architect
implementation
1900
x490
38C
Blinds
brute force
1400
x2150
38B
Chess
brute force
,
implementation
,
math
1200
x3503
38A
Army
implementation
800
x20968
37E
Trial for Chief
graphs
,
greedy
,
shortest paths
2600
x614
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x408
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1654
37B
Computer Game
greedy
,
implementation
1800
x888
37A
Towers
sortings
1000
x24254
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x517
36D
New Game with a Chess Piece
games
2300
x695
36C
Bowls
geometry
,
implementation
2200
x337
36B
Fractal
implementation
1600
x1475
36A
Extra-terrestrial Intelligence
implementation
1300
x2979
35E
Parade
data structures
,
sortings
2100
x727
35D
Animals
dp
,
greedy
1700
x3278
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6734
35B
Warehouse
implementation
1700
x1005
35A
Shell Game
implementation
1000
x6778
34E
Collisions
brute force
,
implementation
,
math
2000
x579
34D
Road Map
dfs and similar
,
graphs
1600
x5068
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4186
34B
Sale
greedy
,
sortings
900
x51432
34A
Reconnaissance 2
implementation
800
x29549
33E
Helper
2600
x128
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1191
33C
Wonderful Randomized Sum
greedy
1800
x2975
33B
String Problem
shortest paths
1800
x4436
33A
What is for dinner?
greedy
,
implementation
1200
x4018
32E
Hide-and-Seek
geometry
,
implementation
2400
x333
32D
Constellation
implementation
1600
x1271
32C
Flea
math
1700
x2124
32B
Borze
expression parsing
,
implementation
800
x62690
32A
Reconnaissance
brute force
800
x12400
31E
TV Game
dp
2400
x1074
31D
Chocolate
dfs and similar
,
implementation
2000
x1031
31C
Schedule
implementation
1700
x1784
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4239
31A
Worms Evolution
implementation
1200
x10227
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x730
30D
King's Problem?
geometry
,
greedy
2600
x429
30C
Shooting Gallery
dp
,
probabilities
1800
x1934
30B
Codeforces World Finals
implementation
1700
x1178
30A
Accounting
brute force
,
math
1400
x3437
29E
Quarrel
graphs
,
shortest paths
2400
x895
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2437
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4844
29B
Traffic Lights
implementation
1500
x2938
29A
Spit Problem
brute force
1000
x7025
28E
DravDe saves the world
geometry
,
math
2800
x90
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x605
28C
Bath Queue
combinatorics
,
dp
,
probabilities
2200
x1025
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4588
28A
Bender Problem
implementation
1600
x790
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x4159
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2483
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2770
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5322
27A
Next Test
implementation
,
sortings
1200
x20030
26E
Multithreading
constructive algorithms
2400
x371
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x777
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x848
26B
Regular Bracket Sequence
greedy
1400
x18882
26A
Almost Prime
number theory
900
x30491
25E
Test
hashing
,
strings
2200
x2410
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x11052
25C
Roads in Berland
graphs
,
shortest paths
1900
x6137
25B
Phone numbers
implementation
1100
x9615
25A
IQ test
brute force
1300
x85109
24E
Berland collider
binary search
2300
x891
24D
Broken robot
dp
,
math
,
probabilities
2400
x1914
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1248
24B
F1 Champions
implementation
1500
x1771
24A
Ring road
graphs
1400
x5032
23E
Tree
dp
2500
x604
23D
Tetragon
geometry
,
math
2600
x336
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1406
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3320
23A
You're Given a String...
brute force
,
greedy
1200
x5252
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1606
22D
Segments
greedy
,
sortings
1900
x2682
22C
System Administrator
graphs
1700
x3069
22B
Bargaining Table
brute force
,
dp
1500
x4190
22A
Second Order Statistics
brute force
800
x21914
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x867
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2102
21B
Intersection
implementation
,
math
2000
x1335
21A
Jabber ID
implementation
,
strings
1900
x1833
20C
Dijkstra?
graphs
,
shortest paths
1900
x32152
20B
Equation
math
2000
x3820
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