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Codeforces Round (Div. 2)
5 days
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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
36A
Extra-terrestrial Intelligence
implementation
1300
x3651
35E
Parade
data structures
,
sortings
2100
x908
35D
Animals
dp
,
greedy
1700
x3978
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x9229
35B
Warehouse
implementation
1700
x1232
35A
Shell Game
implementation
1000
x7767
34E
Collisions
brute force
,
implementation
,
math
2000
x696
34D
Road Map
dfs and similar
,
graphs
1600
x6841
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4957
34B
Sale
greedy
,
sortings
900
x69908
34A
Reconnaissance 2
implementation
800
x36088
33E
Helper
2600
x185
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1660
33C
Wonderful Randomized Sum
greedy
1800
x3681
33B
String Problem
shortest paths
1800
x6203
33A
What is for dinner?
greedy
,
implementation
1200
x5151
32E
Hide-and-Seek
geometry
,
implementation
2400
x453
32D
Constellation
implementation
1600
x1546
32C
Flea
math
1700
x2678
32B
Borze
expression parsing
,
implementation
800
x83804
32A
Reconnaissance
brute force
800
x15609
31E
TV Game
dp
2400
x1379
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
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x984
30D
King's Problem?
geometry
,
greedy
2600
x537
30C
Shooting Gallery
dp
,
probabilities
1800
x2503
30B
Codeforces World Finals
implementation
1700
x1442
30A
Accounting
brute force
,
math
1400
x4162
29E
Quarrel
graphs
,
shortest paths
2400
x1201
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x3101
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x6882
29B
Traffic Lights
implementation
1500
x3449
29A
Spit Problem
brute force
1000
x8577
28E
DravDe saves the world
geometry
,
math
2800
x204
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x751
28C
Bath Queue
combinatorics
,
dp
,
probabilities
2200
x1369
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x5753
28A
Bender Problem
implementation
1600
x1010
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x5055
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x3246
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x3140
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x6050
27A
Next Test
implementation
,
sortings
1200
x23748
26E
Multithreading
constructive algorithms
2400
x460
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x1024
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x1082
26B
Regular Bracket Sequence
greedy
1400
x27959
26A
Almost Prime
number theory
900
x46328
25E
Test
hashing
,
strings
2200
x3547
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x17143
25C
Roads in Berland
graphs
,
shortest paths
1900
x8919
25B
Phone numbers
implementation
1100
x11664
25A
IQ test
brute force
1300
x108322
24E
Berland collider
binary search
2300
x1098
24D
Broken robot
dp
,
math
,
probabilities
2400
x2900
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1489
24B
F1 Champions
implementation
1500
x2118
24A
Ring road
graphs
1400
x7535
23E
Tree
dp
2500
x782
23D
Tetragon
geometry
,
math
2600
x458
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1834
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3985
23A
You're Given a String...
brute force
,
greedy
1200
x6589
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x2232
22D
Segments
greedy
,
sortings
1900
x3558
22C
System Administrator
graphs
1700
x4000
22B
Bargaining Table
brute force
,
dp
1500
x4972
22A
Second Order Statistics
brute force
800
x28621
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x1463
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2666
21B
Intersection
implementation
,
math
2000
x1689
21A
Jabber ID
implementation
,
strings
1900
x2358
20C
Dijkstra?
graphs
,
shortest paths
1900
x51303
20B
Equation
math
2000
x5186
20A
BerOS file system
implementation
1700
x7354
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x2730
19D
Points
data structures
2800
x3486
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1422
19B
Checkout Assistant
dp
1900
x6229
19A
World Football Cup
implementation
1400
x3295
18E
Flag 2
dp
2000
x1330
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1342
18C
Stripe
data structures
,
implementation
1200
x15937
18B
Platforms
brute force
,
math
1700
x2515
18A
Triangle
brute force
,
geometry
1500
x7226
17E
Palisection
strings
2900
x2265
17D
Notepad
number theory
2400
x1412
17C
Balance
dp
2500
x1097
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x6859
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x22928
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x7134
16D
Logging
implementation
,
strings
1900
x1926
16C
Monitor
binary search
,
number theory
1800
x5598
16B
Burglar and Matches
greedy
,
implementation
,
sortings
900
x21401
16A
Flag
implementation
800
x18190
15E
Triangles
combinatorics
,
dp
2600
x710
15D
Map
data structures
,
implementation
,
sortings
2500
x998
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