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Before contest
Codeforces Round 973 (Div. 2)
13:33:20
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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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Problems
#
Name
40B
Repaintings
math
1600
x1159
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3981
39K
Testing
2600
x84
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2949
39I
Tram
2500
x139
39H
Multiplication Table
implementation
1300
x2723
39G
Inverse Function
implementation
2400
x126
39F
Pacifist frogs
implementation
1300
x1546
39E
What Has Dirichlet Got to Do with That?
dp
,
games
2000
x876
39D
Cubical Planet
math
1100
x3933
39C
Moon Craters
dp
,
sortings
2100
x598
39B
Company Income Growth
greedy
1300
x2643
39A
C*++ Calculations
expression parsing
,
greedy
2000
x676
38H
The Great Marathon
dp
2400
x286
38G
Queue
data structures
2300
x702
38F
Smart Boy
dp
,
games
,
strings
2100
x388
38E
Let's Go Rolling!
dp
,
sortings
1800
x2568
38D
Vasya the Architect
implementation
1900
x491
38C
Blinds
brute force
1400
x2157
38B
Chess
brute force
,
implementation
,
math
1200
x3512
38A
Army
implementation
800
x21036
37E
Trial for Chief
graphs
,
greedy
,
shortest paths
2600
x615
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x413
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1661
37B
Computer Game
greedy
,
implementation
1800
x890
37A
Towers
sortings
1000
x24309
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x519
36D
New Game with a Chess Piece
games
2300
x696
36C
Bowls
geometry
,
implementation
2200
x338
36B
Fractal
implementation
1600
x1480
36A
Extra-terrestrial Intelligence
implementation
1300
x2985
35E
Parade
data structures
,
sortings
2100
x733
35D
Animals
dp
,
greedy
1700
x3293
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6752
35B
Warehouse
implementation
1700
x1008
35A
Shell Game
implementation
1000
x6796
34E
Collisions
brute force
,
implementation
,
math
2000
x584
34D
Road Map
dfs and similar
,
graphs
1600
x5093
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4213
34B
Sale
greedy
,
sortings
900
x51746
34A
Reconnaissance 2
implementation
800
x29674
33E
Helper
2600
x129
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1194
33C
Wonderful Randomized Sum
greedy
1800
x2984
33B
String Problem
shortest paths
1800
x4461
33A
What is for dinner?
greedy
,
implementation
1200
x4038
32E
Hide-and-Seek
geometry
,
implementation
2400
x335
32D
Constellation
implementation
1600
x1275
32C
Flea
math
1700
x2131
32B
Borze
expression parsing
,
implementation
800
x63004
32A
Reconnaissance
brute force
800
x12452
31E
TV Game
dp
2400
x1076
31D
Chocolate
dfs and similar
,
implementation
2000
x1034
31C
Schedule
implementation
1700
x1784
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4257
31A
Worms Evolution
implementation
1200
x10254
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x735
30D
King's Problem?
geometry
,
greedy
2600
x430
30C
Shooting Gallery
dp
,
probabilities
1800
x1939
30B
Codeforces World Finals
implementation
1700
x1187
30A
Accounting
brute force
,
math
1400
x3442
29E
Quarrel
graphs
,
shortest paths
2400
x896
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2444
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4867
29B
Traffic Lights
implementation
1500
x2941
29A
Spit Problem
brute force
1000
x7034
28E
DravDe saves the world
geometry
,
math
2800
x90
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x606
28C
Bath Queue
combinatorics
,
dp
,
probabilities
2200
x1029
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4598
28A
Bender Problem
implementation
1600
x791
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x4181
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2495
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2778
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5331
27A
Next Test
implementation
,
sortings
1200
x20086
26E
Multithreading
constructive algorithms
2400
x373
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x777
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x849
26B
Regular Bracket Sequence
greedy
1400
x19015
26A
Almost Prime
number theory
900
x30747
25E
Test
hashing
,
strings
2200
x2427
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x11128
25C
Roads in Berland
graphs
,
shortest paths
1900
x6170
25B
Phone numbers
implementation
1100
x9646
25A
IQ test
brute force
1300
x85483
24E
Berland collider
binary search
2300
x894
24D
Broken robot
dp
,
math
,
probabilities
2400
x1919
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1248
24B
F1 Champions
implementation
1500
x1771
24A
Ring road
graphs
1400
x5048
23E
Tree
dp
2500
x606
23D
Tetragon
geometry
,
math
2600
x336
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1409
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3327
23A
You're Given a String...
brute force
,
greedy
1200
x5290
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1617
22D
Segments
greedy
,
sortings
1900
x2687
22C
System Administrator
graphs
1700
x3083
22B
Bargaining Table
brute force
,
dp
1500
x4205
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