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Codeforces Round 943 (Div. 3)
14:42:57
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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
38E
Let's Go Rolling!
dp
,
sortings
1800
x2482
38D
Vasya the Architect
implementation
1900
x472
38C
Blinds
brute force
1400
x2081
38B
Chess
brute force
,
implementation
,
math
1200
x3385
38A
Army
implementation
800
x20500
37E
Trial for Chief
graphs
,
greedy
,
shortest paths
2600
x578
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x388
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1495
37B
Computer Game
greedy
,
implementation
1800
x861
37A
Towers
sortings
1000
x23540
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x495
36D
New Game with a Chess Piece
games
2300
x675
36C
Bowls
geometry
,
implementation
2200
x295
36B
Fractal
implementation
1600
x1417
36A
Extra-terrestrial Intelligence
implementation
1300
x2892
35E
Parade
data structures
,
sortings
2100
x701
35D
Animals
dp
,
greedy
1700
x3142
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6242
35B
Warehouse
implementation
1700
x988
35A
Shell Game
implementation
1000
x6611
34E
Collisions
brute force
,
implementation
,
math
2000
x563
34D
Road Map
dfs and similar
,
graphs
1600
x4849
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4067
34B
Sale
greedy
,
sortings
900
x48522
34A
Reconnaissance 2
implementation
800
x28424
33E
Helper
2600
x121
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1128
33C
Wonderful Randomized Sum
greedy
1800
x2843
33B
String Problem
shortest paths
1800
x4069
33A
What is for dinner?
greedy
,
implementation
1200
x3844
32E
Hide-and-Seek
geometry
,
implementation
2400
x321
32D
Constellation
implementation
1600
x1237
32C
Flea
math
1700
x2051
32B
Borze
expression parsing
,
implementation
800
x58530
32A
Reconnaissance
brute force
800
x11969
31E
TV Game
dp
2400
x1018
31D
Chocolate
dfs and similar
,
implementation
2000
x988
31C
Schedule
implementation
1700
x1720
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4100
31A
Worms Evolution
implementation
1200
x9913
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x672
30D
King's Problem?
geometry
,
greedy
2600
x409
30C
Shooting Gallery
dp
,
probabilities
1800
x1849
30B
Codeforces World Finals
implementation
1700
x1148
30A
Accounting
brute force
,
math
1400
x3310
29E
Quarrel
graphs
,
shortest paths
2400
x859
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2299
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4548
29B
Traffic Lights
implementation
1500
x2825
29A
Spit Problem
brute force
1000
x6816
28E
DravDe saves the world
geometry
,
math
2800
x85
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x582
28C
Bath Queue
combinatorics
,
dp
,
probabilities
2200
x981
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4396
28A
Bender Problem
implementation
1600
x769
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x3985
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2357
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2684
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5134
27A
Next Test
implementation
,
sortings
1200
x19282
26E
Multithreading
constructive algorithms
2400
x362
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x745
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x820
26B
Regular Bracket Sequence
greedy
1400
x17436
26A
Almost Prime
number theory
900
x28464
25E
Test
hashing
,
strings
2200
x2168
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10324
25C
Roads in Berland
graphs
,
shortest paths
1900
x5843
25B
Phone numbers
implementation
1100
x9280
25A
IQ test
brute force
1300
x80938
24E
Berland collider
binary search
2300
x855
24D
Broken robot
dp
,
math
,
probabilities
2400
x1789
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1210
24B
F1 Champions
implementation
1500
x1709
24A
Ring road
graphs
1400
x4757
23E
Tree
dp
2500
x588
23D
Tetragon
geometry
,
math
2600
x325
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1355
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3194
23A
You're Given a String...
brute force
,
greedy
1200
x5069
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1534
22D
Segments
greedy
,
sortings
1900
x2608
22C
System Administrator
graphs
1700
x2935
22B
Bargaining Table
brute force
,
dp
1500
x4070
22A
Second Order Statistics
brute force
800
x20818
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x790
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2010
21B
Intersection
implementation
,
math
2000
x1298
21A
Jabber ID
implementation
,
strings
1900
x1770
20C
Dijkstra?
graphs
,
shortest paths
1900
x29781
20B
Equation
math
2000
x3641
20A
BerOS file system
implementation
1700
x5931
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1608
19D
Points
data structures
2800
x2085
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1043
19B
Checkout Assistant
dp
1900
x4393
19A
World Football Cup
implementation
1400
x2578
18E
Flag 2
dp
2000
x1016
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1029
18C
Stripe
data structures
,
implementation
1200
x12444
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