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Codeforces Round 950 (Div. 3)
43:42:41
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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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Problems
#
Name
36B
Fractal
implementation
1600
x1431
36A
Extra-terrestrial Intelligence
implementation
1300
x2906
35E
Parade
data structures
,
sortings
2100
x704
35D
Animals
dp
,
greedy
1700
x3168
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6417
35B
Warehouse
implementation
1700
x993
35A
Shell Game
implementation
1000
x6639
34E
Collisions
brute force
,
implementation
,
math
2000
x564
34D
Road Map
dfs and similar
,
graphs
1600
x4879
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4085
34B
Sale
greedy
,
sortings
900
x49239
34A
Reconnaissance 2
implementation
800
x28659
33E
Helper
2600
x124
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1143
33C
Wonderful Randomized Sum
greedy
1800
x2888
33B
String Problem
shortest paths
1800
x4122
33A
What is for dinner?
greedy
,
implementation
1200
x3882
32E
Hide-and-Seek
geometry
,
implementation
2400
x324
32D
Constellation
implementation
1600
x1242
32C
Flea
math
1700
x2065
32B
Borze
expression parsing
,
implementation
800
x59455
32A
Reconnaissance
brute force
800
x12060
31E
TV Game
dp
2400
x1026
31D
Chocolate
dfs and similar
,
implementation
2000
x1000
31C
Schedule
implementation
1700
x1736
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4125
31A
Worms Evolution
implementation
1200
x9976
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x679
30D
King's Problem?
geometry
,
greedy
2600
x412
30C
Shooting Gallery
dp
,
probabilities
1800
x1861
30B
Codeforces World Finals
implementation
1700
x1155
30A
Accounting
brute force
,
math
1400
x3338
29E
Quarrel
graphs
,
shortest paths
2400
x867
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2335
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4599
29B
Traffic Lights
implementation
1500
x2849
29A
Spit Problem
brute force
1000
x6859
28E
DravDe saves the world
geometry
,
math
2800
x87
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x591
28C
Bath Queue
combinatorics
,
dp
,
probabilities
2200
x987
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4432
28A
Bender Problem
implementation
1600
x771
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x4012
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2380
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2700
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5170
27A
Next Test
implementation
,
sortings
1200
x19445
26E
Multithreading
constructive algorithms
2400
x367
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x761
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x825
26B
Regular Bracket Sequence
greedy
1400
x17685
26A
Almost Prime
number theory
900
x28903
25E
Test
hashing
,
strings
2200
x2220
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10478
25C
Roads in Berland
graphs
,
shortest paths
1900
x5916
25B
Phone numbers
implementation
1100
x9363
25A
IQ test
brute force
1300
x81902
24E
Berland collider
binary search
2300
x864
24D
Broken robot
dp
,
math
,
probabilities
2400
x1808
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1218
24B
F1 Champions
implementation
1500
x1720
24A
Ring road
graphs
1400
x4820
23E
Tree
dp
2500
x592
23D
Tetragon
geometry
,
math
2600
x326
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1363
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3209
23A
You're Given a String...
brute force
,
greedy
1200
x5097
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1555
22D
Segments
greedy
,
sortings
1900
x2633
22C
System Administrator
graphs
1700
x2963
22B
Bargaining Table
brute force
,
dp
1500
x4095
22A
Second Order Statistics
brute force
800
x21054
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x805
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2029
21B
Intersection
implementation
,
math
2000
x1307
21A
Jabber ID
implementation
,
strings
1900
x1788
20C
Dijkstra?
graphs
,
shortest paths
1900
x30377
20B
Equation
math
2000
x3678
20A
BerOS file system
implementation
1700
x5980
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1635
19D
Points
data structures
2800
x2160
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1051
19B
Checkout Assistant
dp
1900
x4464
19A
World Football Cup
implementation
1400
x2649
18E
Flag 2
dp
2000
x1027
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1034
18C
Stripe
data structures
,
implementation
1200
x12544
18B
Platforms
brute force
,
math
1700
x2070
18A
Triangle
brute force
,
geometry
1500
x5728
17E
Palisection
strings
2900
x1517
17D
Notepad
number theory
2400
x1041
17C
Balance
dp
2500
x819
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4513
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x15252
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x4703
16D
Logging
implementation
,
strings
1900
x1518
16C
Monitor
binary search
,
number theory
1800
x4543
16B
Burglar and Matches
greedy
,
implementation
,
sortings
900
x17025
16A
Flag
implementation
800
x13678
15E
Triangles
combinatorics
,
dp
2600
x559
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