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Before contest
Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
08:10:10
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combine-tags-by-or
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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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Status
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Custom test
Problems
#
Name
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x373
51D
Geometrical problem
implementation
2200
x456
50E
Square Equation Roots
math
2300
x348
50D
Bombing
binary search
,
dp
,
probabilities
2100
x608
50C
Happy Farm 5
geometry
2000
x740
49E
Common ancestor
dp
2300
x652
48E
Ivan the Fool VS Gorynych the Dragon
dp
,
games
,
graphs
2100
x569
47E
Cannon
data structures
,
geometry
,
sortings
2200
x358
47D
Safe
brute force
2200
x759
47C
Crossword
implementation
2000
x762
46G
Emperor's Problem
geometry
2500
x110
46F
Hercule Poirot Problem
dsu
,
graphs
2300
x316
45H
Road Problem
graphs
2100
x178
45G
Prime Problem
number theory
2200
x1006
45F
Goats and Wolves
greedy
2500
x127
45E
Director
constructive algorithms
,
greedy
2000
x533
45B
School
dp
,
dsu
2200
x271
44J
Triminoes
constructive algorithms
,
greedy
2000
x559
44I
Toys
brute force
,
combinatorics
2300
x185
44G
Shooting Gallery
data structures
,
implementation
2500
x394
43E
Race
brute force
,
implementation
,
two pointers
2300
x388
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1069
42D
Strange town
constructive algorithms
,
math
2300
x392
42C
Safe cracking
brute force
,
constructive algorithms
2200
x459
40E
Number Table
combinatorics
2500
x660
40C
Berland Square
implementation
,
math
2300
x243
39I
Tram
2500
x127
39G
Inverse Function
implementation
2400
x125
39E
What Has Dirichlet Got to Do with That?
dp
,
games
2000
x862
39C
Moon Craters
dp
,
sortings
2100
x573
39A
C*++ Calculations
expression parsing
,
greedy
2000
x659
38H
The Great Marathon
dp
2400
x268
38G
Queue
data structures
2300
x687
38F
Smart Boy
dp
,
games
,
strings
2100
x380
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x391
36D
New Game with a Chess Piece
games
2300
x688
36C
Bowls
geometry
,
implementation
2200
x332
35E
Parade
data structures
,
sortings
2100
x720
34E
Collisions
brute force
,
implementation
,
math
2000
x574
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1149
32E
Hide-and-Seek
geometry
,
implementation
2400
x324
31E
TV Game
dp
2400
x1049
31D
Chocolate
dfs and similar
,
implementation
2000
x1011
29E
Quarrel
graphs
,
shortest paths
2400
x877
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2376
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x593
28C
Bath Queue
combinatorics
,
dp
,
probabilities
2200
x1002
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x4075
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2400
26E
Multithreading
constructive algorithms
2400
x368
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x767
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x839
25E
Test
hashing
,
strings
2200
x2302
24E
Berland collider
binary search
2300
x875
24D
Broken robot
dp
,
math
,
probabilities
2400
x1852
23E
Tree
dp
2500
x597
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1386
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1579
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x839
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2063
21B
Intersection
implementation
,
math
2000
x1321
20B
Equation
math
2000
x3750
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1072
18E
Flag 2
dp
2000
x1035
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1044
17D
Notepad
number theory
2400
x1049
17C
Balance
dp
2500
x829
15D
Map
data structures
,
implementation
,
sortings
2500
x738
15C
Industrial Nim
games
2000
x2191
13C
Sequence
dp
,
sortings
2200
x4413
13B
Letter A
geometry
,
implementation
2000
x983
12E
Start of the session
constructive algorithms
2100
x1176
12D
Ball
data structures
,
sortings
2400
x2203
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4616
11C
How Many Squares?
implementation
2200
x605
10C
Digital Root
number theory
2000
x1422
9E
Interestring graph and Apples
dfs and similar
,
dsu
,
graphs
2300
x1013
8C
Looking for Order
bitmasks
,
dp
2000
x3442
7D
Palindrome Degree
hashing
,
strings
2200
x3580
5E
Bindian Signalizing
data structures
2400
x2067
5D
Follow Traffic Rules
implementation
,
math
2100
x1676
2B
The least round way
dp
,
math
2000
x10616
1C
Ancient Berland Circus
geometry
,
math
2100
x5605
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