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Contest is running
Codeforces Round 973 (Div. 2)
01:37:50
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Codeforces Round 974 (Div. 3)
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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
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strings
ternary search
trees
two pointers
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Problems
#
Name
1166B
All the Vowels Please
constructive algorithms
,
math
,
number theory
1100
x11451
1166A
Silent Classroom
combinatorics
,
greedy
900
x14172
1165F2
Microtransactions (hard version)
binary search
,
greedy
,
implementation
2000
x2171
1165F1
Microtransactions (easy version)
binary search
,
greedy
2000
x1887
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x8274
1165D
Almost All Divisors
math
,
number theory
1600
x15927
1165C
Good String
greedy
1300
x12896
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20853
1165A
Remainder
implementation
,
math
1100
x13760
1163F
Indecisive Taxi Fee
data structures
,
graphs
,
shortest paths
3000
x874
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x665
1163D
Mysterious Code
dp
,
strings
2100
x1266
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3619
1163C1
Power Transmission (Easy Edition)
brute force
,
geometry
1900
x3309
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7201
1163B1
Cat Party (Easy Edition)
data structures
,
implementation
1500
x6961
1163A
Eating Soup
greedy
,
math
900
x12901
1162B
Double Matrix
brute force
,
greedy
1400
x5799
1162A
Zoning Restrictions Again
implementation
800
x8252
1160A2
Collaboration
*special problem
1159B
Expansion coefficient of the array
implementation
,
math
1300
x7046
1159A
A pile of stones
implementation
,
math
800
x12649
1158F
Density of subarrays
dp
,
math
3500
x409
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x151
1158D
Winding polygonal line
constructive algorithms
,
geometry
,
greedy
,
math
2600
x836
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1936
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2224
1158A
The Party and Sweets
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
1500
x7096
1157G
Inverse of Rows and Columns
brute force
,
constructive algorithms
2200
x913
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2628
1157E
Minimum Array
binary search
,
data structures
,
greedy
1700
x8357
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x3739
1157C2
Increasing Subsequence (hard version)
greedy
1700
x7971
1157C1
Increasing Subsequence (easy version)
greedy
1300
x12598
1157B
Long Number
greedy
1300
x14667
1157A
Reachable Numbers
implementation
1100
x15622
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x129
1156F
Card Bag
dp
,
math
,
probabilities
2300
x1393
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2999
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3875
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x6070
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6209
1156A
Inscribed Figures
geometry
1400
x8188
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x416
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1424
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6900
1155C
Alarm Clocks Everywhere
math
,
number theory
1300
x9220
1155B
Game with Telephone Numbers
games
,
greedy
,
implementation
1200
x11871
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x14869
1154G
Minimum Possible LCM
brute force
,
greedy
,
math
,
number theory
2200
x2727
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2833
1154E
Two Teams
data structures
,
implementation
,
sortings
1800
x6251
1154D
Walking Robot
greedy
1500
x9940
1154C
Gourmet Cat
implementation
,
math
1400
x10376
1154B
Make Them Equal
math
1200
x16559
1154A
Restoring Three Numbers
math
800
x70145
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x793
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1496
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4962
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7388
1153B
Serval and Toy Bricks
constructive algorithms
,
greedy
1200
x9058
1153A
Serval and Bus
brute force
,
math
1000
x11497
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x640
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x558
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x971
1152D
Neko and Aki's Prank
dp
,
greedy
,
trees
2100
x2415
1152C
Neko does Maths
brute force
,
math
,
number theory
1800
x6653
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8894
1152A
Neko Finds Grapes
greedy
,
implementation
,
math
800
x15131
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1211
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3321
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8390
1151C
Problem for Nazar
constructive algorithms
,
math
1800
x5333
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x11128
1151A
Maxim and Biology
brute force
,
strings
1000
x11191
1150B
Tiling Challenge
greedy
,
implementation
900
x11257
1150A
Stock Arbitraging
greedy
,
implementation
800
x11799
1149E
Election Promises
games
,
graphs
3200
x523
1149D
Abandoning Roads
brute force
,
dp
,
graphs
,
greedy
3000
x780
1149C
Tree Generator™
data structures
,
implementation
,
trees
2700
x1253
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1894
1149A
Prefix Sum Primes
constructive algorithms
,
greedy
,
math
,
number theory
1200
x15155
1148H
Holy Diver
data structures
3500
x257
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x320
1148F
Foo Fighters
bitmasks
,
constructive algorithms
2700
x1008
1148E
Earth Wind and Fire
constructive algorithms
,
greedy
,
math
,
sortings
,
two pointers
2300
x1672
1148D
Dirty Deeds Done Dirt Cheap
greedy
,
sortings
1800
x4964
1148C
Crazy Diamond
constructive algorithms
,
sortings
1700
x5292
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7378
1148A
Another One Bites The Dust
greedy
800
x14858
1147F
Zigzag Game
games
,
interactive
3500
x263
1147E
Rainbow Coins
interactive
3000
x338
1147D
Palindrome XOR
dfs and similar
,
graphs
2400
x747
1147C
Thanos Nim
games
2000
x3248
1147B
Chladni Figure
brute force
,
strings
1900
x2872
1147A
Hide and Seek
graphs
1500
x5234
1146H
Satanic Panic
dp
,
geometry
2900
x607
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x820
1146F
Leaf Partition
dp
,
trees
2500
x1171
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x887
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