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Before contest
Codeforces Round 977 (Div. 2)
2 days
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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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Problems
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Status
Standings
Custom test
Problems
#
Name
990F
Flow Control
dfs and similar
,
dp
,
greedy
,
trees
2400
x895
990E
Post Lamps
brute force
,
greedy
2100
x2016
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x3832
990C
Bracket Sequences Concatenation Problem
implementation
1500
x5894
990B
Micro-World
greedy
,
sortings
1200
x8077
990A
Commentary Boxes
implementation
,
math
1000
x10567
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x235
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x517
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3797
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x7047
989A
A Blend of Springtime
implementation
,
strings
900
x10324
988F
Rain and Umbrellas
dp
2100
x2318
988E
Divisibility by 25
brute force
,
greedy
2100
x3951
988D
Points and Powers of Two
brute force
,
math
1800
x7268
988C
Equal Sums
implementation
,
sortings
1400
x10187
988B
Substrings Sort
sortings
,
strings
1100
x18430
988A
Diverse Team
brute force
,
implementation
800
x24917
987C
Three displays
brute force
,
dp
,
implementation
1400
x13500
987B
High School: Become Human
math
1100
x11613
987A
Infinity Gauntlet
implementation
800
x16532
986F
Oppa Funcan Style Remastered
graphs
,
math
,
number theory
,
shortest paths
3300
x612
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x794
986D
Perfect Encoding
fft
,
math
3100
x330
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2446
986B
Petr and Permutations
combinatorics
,
math
1800
x4650
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x6902
985G
Team Players
combinatorics
2700
x517
985F
Isomorphic Strings
hashing
,
strings
2300
x1855
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3646
985D
Sand Fortress
binary search
,
constructive algorithms
,
math
2100
x2551
985C
Liebig's Barrels
greedy
1500
x5764
985B
Switches and Lamps
implementation
1200
x7391
985A
Chess Placing
implementation
1100
x8136
984B
Minesweeper
implementation
1100
x7351
984A
Game
sortings
800
x19391
983E
NN country
binary search
,
data structures
,
trees
2800
x938
983D
Arkady and Rectangles
data structures
3300
x388
983C
Elevator
dp
,
graphs
,
shortest paths
2400
x832
983B
XOR-pyramid
dp
1800
x5505
983A
Finite or not?
implementation
,
math
1700
x4544
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x190
982E
Billiard
geometry
,
number theory
2600
x705
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2297
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x11485
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8283
982A
Row
brute force
,
constructive algorithms
1200
x9063
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x270
981G
Magic multisets
data structures
2500
x685
981F
Round Marriage
binary search
,
graph matchings
,
greedy
2500
x783
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x2089
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3241
981C
Useful Decomposition
implementation
,
trees
1400
x5401
981B
Businessmen Problems
sortings
1000
x6940
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9280
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x196
980E
The Number Games
data structures
,
greedy
,
trees
2200
x1922
980D
Perfect Groups
dp
,
math
,
number theory
2100
x2668
980C
Posterized
games
,
greedy
1700
x3786
980B
Marlin
constructive algorithms
1600
x4688
980A
Links and Pearls
implementation
,
math
900
x10418
979E
Kuro and Topological Parity
dp
2400
x632
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1814
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6258
979B
Treasure Hunt
greedy
1800
x4414
979A
Pizza, Pizza, Pizza!!!
math
1000
x13728
978G
Petya's Exams
greedy
,
implementation
,
sortings
1700
x4357
978F
Mentors
binary search
,
data structures
,
implementation
1500
x8276
978E
Bus Video System
combinatorics
,
math
1400
x9535
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x8731
978C
Letters
binary search
,
implementation
,
two pointers
1000
x25501
978B
File Name
greedy
,
strings
800
x36231
978A
Remove Duplicates
implementation
800
x27065
977F
Consecutive Subsequence
dp
1700
x18876
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x20586
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x18319
977C
Less or Equal
sortings
1200
x34537
977B
Two-gram
implementation
,
strings
900
x39214
977A
Wrong Subtraction
implementation
800
x166774
976F
Minimal k-covering
flows
,
graphs
2500
x580
976E
Well played!
greedy
,
sortings
2100
x2397
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x687
976C
Nested Segments
greedy
,
implementation
,
sortings
1500
x6878
976B
Lara Croft and the New Game
implementation
,
math
1300
x5720
976A
Minimum Binary Number
implementation
800
x10529
975E
Hag's Khashba
geometry
2600
x307
975D
Ghosts
geometry
,
math
2000
x2182
975C
Valhalla Siege
binary search
1400
x9639
975B
Mancala
brute force
,
implementation
1100
x6837
975A
Aramic script
implementation
,
strings
900
x9252
967B
Watering System
math
,
sortings
1000
x7085
967A
Mind the Gap
implementation
1100
x4364
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1441
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x3082
965C
Greedy Arkady
math
2000
x2099
965B
Battleship
implementation
1300
x4571
965A
Paper Airplanes
math
800
x9505
964B
Messages
math
1300
x4356
964A
Splits
math
800
x9639
963E
Circles of Waiting
math
3100
x547
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x2021
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