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Before contest
Codeforces Round 974 (Div. 3)
16:55:01
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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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Standings
Custom test
Problems
#
Name
984A
Game
sortings
800
x19366
983E
NN country
binary search
,
data structures
,
trees
2800
x935
983D
Arkady and Rectangles
data structures
3300
x386
983C
Elevator
dp
,
graphs
,
shortest paths
2400
x827
983B
XOR-pyramid
dp
1800
x5487
983A
Finite or not?
implementation
,
math
1700
x4539
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x190
982E
Billiard
geometry
,
number theory
2600
x704
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2288
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x11436
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8271
982A
Row
brute force
,
constructive algorithms
1200
x9053
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x270
981G
Magic multisets
data structures
2500
x683
981F
Round Marriage
binary search
,
graph matchings
,
greedy
2500
x782
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x2084
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3236
981C
Useful Decomposition
implementation
,
trees
1400
x5375
981B
Businessmen Problems
sortings
1000
x6912
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9252
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x196
980E
The Number Games
data structures
,
greedy
,
trees
2200
x1918
980D
Perfect Groups
dp
,
math
,
number theory
2100
x2658
980C
Posterized
games
,
greedy
1700
x3777
980B
Marlin
constructive algorithms
1600
x4680
980A
Links and Pearls
implementation
,
math
900
x10407
979E
Kuro and Topological Parity
dp
2400
x624
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1808
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6244
979B
Treasure Hunt
greedy
1800
x4406
979A
Pizza, Pizza, Pizza!!!
math
1000
x13700
978G
Petya's Exams
greedy
,
implementation
,
sortings
1700
x4339
978F
Mentors
binary search
,
data structures
,
implementation
1500
x8248
978E
Bus Video System
combinatorics
,
math
1400
x9508
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x8695
978C
Letters
binary search
,
implementation
,
two pointers
1000
x25414
978B
File Name
greedy
,
strings
800
x36124
978A
Remove Duplicates
implementation
800
x26960
977F
Consecutive Subsequence
dp
1700
x18734
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x20471
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x18253
977C
Less or Equal
sortings
1200
x34325
977B
Two-gram
implementation
,
strings
900
x38945
977A
Wrong Subtraction
implementation
800
x165596
976F
Minimal k-covering
flows
,
graphs
2500
x577
976E
Well played!
greedy
,
sortings
2100
x2388
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x680
976C
Nested Segments
greedy
,
implementation
,
sortings
1500
x6835
976B
Lara Croft and the New Game
implementation
,
math
1300
x5712
976A
Minimum Binary Number
implementation
800
x10521
975E
Hag's Khashba
geometry
2600
x305
975D
Ghosts
geometry
,
math
2000
x2146
975C
Valhalla Siege
binary search
1400
x9601
975B
Mancala
brute force
,
implementation
1100
x6823
975A
Aramic script
implementation
,
strings
900
x9219
967B
Watering System
math
,
sortings
1000
x7062
967A
Mind the Gap
implementation
1100
x4359
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1437
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x3072
965C
Greedy Arkady
math
2000
x2091
965B
Battleship
implementation
1300
x4564
965A
Paper Airplanes
math
800
x9454
964B
Messages
math
1300
x4346
964A
Splits
math
800
x9629
963E
Circles of Waiting
math
3100
x547
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1971
963C
Cutting Rectangle
brute force
,
math
,
number theory
2600
x569
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2789
963A
Alternating Sum
math
,
number theory
1800
x3290
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x180
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1326
962E
Byteland, Berland and Disputed Cities
constructive algorithms
,
greedy
2200
x1062
962D
Merge Equals
data structures
,
implementation
1600
x6834
962C
Make a Square
brute force
,
implementation
,
math
1400
x7815
962B
Students in Railway Carriage
constructive algorithms
,
greedy
,
implementation
1300
x7661
962A
Equator
implementation
1300
x12769
961G
Partitions
combinatorics
,
math
,
number theory
2700
x1348
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x785
961E
Tufurama
data structures
1900
x3599
961D
Pair Of Lines
geometry
2000
x4250
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5291
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x20706
961A
Tetris
implementation
900
x10031
960H
Santa's Gift
data structures
,
trees
3100
x273
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x1065
960F
Pathwalks
data structures
,
dp
,
graphs
2100
x2957
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1928
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1880
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3921
960B
Minimize the error
data structures
,
greedy
,
sortings
1500
x7860
960A
Check the string
implementation
1200
x8164
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x2078
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3390
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3083
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5763
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9581
959A
Mahmoud and Ehab and the even-odd game
games
,
math
800
x46723
958F3
Lightsabers (hard)
fft
2600
x692
958F2
Lightsabers (medium)
binary search
,
two pointers
1800
x1227
958F1
Lightsabers (easy)
implementation
1500
x1607
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