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Codeforces Round 945 (Div. 2)
2 days
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*has extra registration
→ Filter Problems
Difficulty:
—
implementation
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
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Custom test
Problems
#
Name
72B
INI-file
*special problem
,
implementation
2200
x75
71D
Solitaire
brute force
,
implementation
2200
x600
71B
Progress Bar
implementation
,
math
1300
x4365
70E
Information Reform
dp
,
implementation
,
trees
2700
x478
69E
Subsegments
data structures
,
implementation
1800
x4034
69C
Game
implementation
2000
x558
69B
Bets
greedy
,
implementation
1200
x3191
69A
Young Physicist
implementation
,
math
1000
x155473
68A
Irrational problem
implementation
,
number theory
1100
x4817
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2056
66C
Petya and File System
data structures
,
implementation
1800
x997
66B
Petya and Countryside
brute force
,
implementation
1100
x19533
66A
Petya and Java
implementation
,
strings
1300
x6219
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x84
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1320
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1783
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x331
64A
Factorial
*special problem
,
implementation
1300
x2706
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x715
63C
Bulls and Cows
brute force
,
implementation
1700
x1627
63B
Settlers' Training
implementation
1200
x4713
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x10884
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x247
62B
Tyndex.Brome
binary search
,
implementation
1800
x1263
61A
Ultra-Fast Mathematician
implementation
800
x103900
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3529
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x603
59B
Fortune Telling
implementation
,
number theory
1200
x6666
59A
Word
implementation
,
strings
800
x162661
57B
Martian Architecture
implementation
1600
x987
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2815
56C
Corporation Mail
data structures
,
expression parsing
,
implementation
1700
x1118
56B
Spoilt Permutation
implementation
1300
x3619
56A
Bar
implementation
1000
x8342
55A
Flea travel
implementation
,
math
1200
x3340
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x737
54A
Presents
implementation
1300
x2008
53B
Blog Photo
binary search
,
implementation
1700
x1363
53A
Autocomplete
implementation
1100
x4838
52A
123-sequence
implementation
900
x8304
51D
Geometrical problem
implementation
2200
x417
51A
Cheaterius's Problem
implementation
1300
x1781
49D
Game
brute force
,
dp
,
implementation
1800
x1834
49A
Sleuth
implementation
800
x12912
48B
Land Lot
brute force
,
implementation
1200
x2604
48A
Rock-paper-scissors
implementation
,
schedules
900
x5631
47C
Crossword
implementation
2000
x740
47B
Coins
implementation
1200
x13068
46D
Parking Lot
data structures
,
implementation
1800
x959
46B
T-shirts from Sponsor
implementation
1100
x3540
46A
Ball Game
brute force
,
implementation
800
x8384
45A
Codecraft III
implementation
900
x6337
44G
Shooting Gallery
data structures
,
implementation
2500
x365
44C
Holidays
implementation
1300
x3211
44B
Cola
implementation
1500
x1903
44A
Indian Summer
implementation
900
x9490
43E
Race
brute force
,
implementation
,
two pointers
2300
x375
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1048
43B
Letter
implementation
,
strings
1100
x15738
42B
Game of chess unfinished
implementation
1700
x922
42A
Guilty --- to the kitchen!
greedy
,
implementation
1400
x2758
41C
Email address
expression parsing
,
implementation
1300
x3641
41A
Translation
implementation
,
strings
800
x135385
40C
Berland Square
implementation
,
math
2300
x240
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3855
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2794
39H
Multiplication Table
implementation
1300
x2612
39G
Inverse Function
implementation
2400
x123
39F
Pacifist frogs
implementation
1300
x1496
38D
Vasya the Architect
implementation
1900
x478
38B
Chess
brute force
,
implementation
,
math
1200
x3393
38A
Army
implementation
800
x20551
37B
Computer Game
greedy
,
implementation
1800
x862
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x496
36C
Bowls
geometry
,
implementation
2200
x323
36B
Fractal
implementation
1600
x1421
36A
Extra-terrestrial Intelligence
implementation
1300
x2900
35B
Warehouse
implementation
1700
x989
35A
Shell Game
implementation
1000
x6620
34E
Collisions
brute force
,
implementation
,
math
2000
x563
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4073
34A
Reconnaissance 2
implementation
800
x28511
33A
What is for dinner?
greedy
,
implementation
1200
x3854
32E
Hide-and-Seek
geometry
,
implementation
2400
x321
32D
Constellation
implementation
1600
x1238
32B
Borze
expression parsing
,
implementation
800
x58960
31D
Chocolate
dfs and similar
,
implementation
2000
x990
31C
Schedule
implementation
1700
x1724
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4106
31A
Worms Evolution
implementation
1200
x9937
30B
Codeforces World Finals
implementation
1700
x1149
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4565
29B
Traffic Lights
implementation
1500
x2835
28A
Bender Problem
implementation
1600
x769
27A
Next Test
implementation
,
sortings
1200
x19347
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x823
25B
Phone numbers
implementation
1100
x9318
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1214
24B
F1 Champions
implementation
1500
x1714
21B
Intersection
implementation
,
math
2000
x1303
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