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Codeforces Round 1119 (Div. 3)
2 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
36D
New Game with a Chess Piece
games
2300
x784
36C
Bowls
geometry
,
implementation
2200
x394
36B
Fractal
implementation
1600
x2082
36A
Extra-terrestrial Intelligence
implementation
1300
x3615
35E
Parade
data structures
,
sortings
2100
x900
35D
Animals
dp
,
greedy
1700
x3955
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x9115
35B
Warehouse
implementation
1700
x1223
35A
Shell Game
implementation
1000
x7716
34E
Collisions
brute force
,
implementation
,
math
2000
x693
34D
Road Map
dfs and similar
,
graphs
1600
x6709
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4896
34B
Sale
greedy
,
sortings
900
x68668
34A
Reconnaissance 2
implementation
800
x35665
33E
Helper
2600
x178
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1642
33C
Wonderful Randomized Sum
greedy
1800
x3656
33B
String Problem
shortest paths
1800
x6099
33A
What is for dinner?
greedy
,
implementation
1200
x5090
32E
Hide-and-Seek
geometry
,
implementation
2400
x452
32D
Constellation
implementation
1600
x1521
32C
Flea
math
1700
x2642
32B
Borze
expression parsing
,
implementation
800
x82697
32A
Reconnaissance
brute force
800
x15354
31E
TV Game
dp
2400
x1369
31D
Chocolate
dfs and similar
,
implementation
2000
x1262
31C
Schedule
implementation
1700
x2072
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4822
31A
Worms Evolution
implementation
1200
x12935
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x977
30D
King's Problem?
geometry
,
greedy
2600
x534
30C
Shooting Gallery
dp
,
probabilities
1800
x2482
30B
Codeforces World Finals
implementation
1700
x1418
30A
Accounting
brute force
,
math
1400
x4118
29E
Quarrel
graphs
,
shortest paths
2400
x1189
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x3064
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x6789
29B
Traffic Lights
implementation
1500
x3421
29A
Spit Problem
brute force
1000
x8490
28E
DravDe saves the world
geometry
,
math
2800
x202
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x730
28C
Bath Queue
combinatorics
,
dp
,
probabilities
2200
x1365
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x5710
28A
Bender Problem
implementation
1600
x1003
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x5021
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x3199
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x3113
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x6001
27A
Next Test
implementation
,
sortings
1200
x23559
26E
Multithreading
constructive algorithms
2400
x442
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x1011
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x1072
26B
Regular Bracket Sequence
greedy
1400
x27319
26A
Almost Prime
number theory
900
x45462
25E
Test
hashing
,
strings
2200
x3459
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x16761
25C
Roads in Berland
graphs
,
shortest paths
1900
x8765
25B
Phone numbers
implementation
1100
x11557
25A
IQ test
brute force
1300
x107089
24E
Berland collider
binary search
2300
x1086
24D
Broken robot
dp
,
math
,
probabilities
2400
x2849
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1477
24B
F1 Champions
implementation
1500
x2097
24A
Ring road
graphs
1400
x7360
23E
Tree
dp
2500
x770
23D
Tetragon
geometry
,
math
2600
x437
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1809
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3951
23A
You're Given a String...
brute force
,
greedy
1200
x6531
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x2195
22D
Segments
greedy
,
sortings
1900
x3501
22C
System Administrator
graphs
1700
x3947
22B
Bargaining Table
brute force
,
dp
1500
x4901
22A
Second Order Statistics
brute force
800
x28185
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x1412
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2641
21B
Intersection
implementation
,
math
2000
x1668
21A
Jabber ID
implementation
,
strings
1900
x2329
20C
Dijkstra?
graphs
,
shortest paths
1900
x50466
20B
Equation
math
2000
x5035
20A
BerOS file system
implementation
1700
x7278
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x2693
19D
Points
data structures
2800
x3429
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1413
19B
Checkout Assistant
dp
1900
x6112
19A
World Football Cup
implementation
1400
x3265
18E
Flag 2
dp
2000
x1321
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1331
18C
Stripe
data structures
,
implementation
1200
x15807
18B
Platforms
brute force
,
math
1700
x2477
18A
Triangle
brute force
,
geometry
1500
x7150
17E
Palisection
strings
2900
x2204
17D
Notepad
number theory
2400
x1396
17C
Balance
dp
2500
x1081
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x6780
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x22526
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x6982
16D
Logging
implementation
,
strings
1900
x1901
16C
Monitor
binary search
,
number theory
1800
x5536
16B
Burglar and Matches
greedy
,
implementation
,
sortings
900
x21224
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