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Before contest
Codeforces Round 941 (Div. 1)
17:03:23
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
17:03:23
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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
#
Name
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1970
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5614
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x2315
1056B
Divide Candies
math
,
number theory
1600
x4065
1056A
Determine Line
implementation
800
x6533
1055G
Jellyfish Nightmare
3500
x75
1055F
Tree and XOR
strings
,
trees
2900
x446
1055E
Segments on the Line
binary search
,
dp
2500
x707
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x615
1055C
Lucky Days
math
,
number theory
1900
x1840
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x4892
1055A
Metro
graphs
900
x10347
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x171
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x257
1054F
Electric Scheme
flows
,
graph matchings
2700
x305
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x475
1054D
Changing Array
greedy
,
implementation
1900
x2211
1054C
Candies Distribution
constructive algorithms
,
implementation
1500
x4228
1054B
Appending Mex
implementation
1000
x6419
1054A
Elevator or Stairs?
implementation
800
x8969
1053E
Euler tour
constructive algorithms
,
trees
3500
x193
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x359
1051F
The Shortest Statement
graphs
,
shortest paths
,
trees
2400
x2653
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x867
1051D
Bicolorings
bitmasks
,
dp
1700
x7113
1051C
Vasya and Multisets
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9127
1051B
Relatively Prime Pairs
greedy
,
math
,
number theory
1000
x16465
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8307
1047B
Cover Points
geometry
,
math
900
x16880
1047A
Little C Loves 3 I
math
800
x19515
1046I
Say Hello
geometry
2300
x303
1046F
Splitting money
implementation
1400
x2724
1046C
Space Formula
greedy
1400
x3033
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x161
1045I
Palindrome Pairs
hashing
,
strings
1600
x4064
1045H
Self-exploration
math
2400
x365
1045G
AI robots
data structures
2200
x1521
1045F
Shady Lady
geometry
,
math
3400
x92
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x118
1045D
Interstellar battle
math
,
probabilities
,
trees
2200
x627
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x620
1045B
Space Isaac
hashing
,
number theory
2400
x488
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x317
1044F
DFS
data structures
2700
x499
1044E
Grid Sort
implementation
3100
x112
1044D
Deduction Queries
data structures
,
dsu
2400
x968
1044C
Optimal Polygon Perimeter
dp
,
geometry
2100
x1199
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1540
1044A
The Tower is Going Home
binary search
,
two pointers
1700
x2846
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x2171
1043E
Train Hard, Win Easy
constructive algorithms
,
greedy
,
math
,
sortings
1900
x2683
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4367
1043C
Smallest Word
constructive algorithms
,
greedy
,
implementation
1500
x6775
1043B
Lost Array
implementation
1200
x6195
1043A
Elections
implementation
,
math
800
x10701
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1237
1042E
Vasya and Magic Matrix
dp
,
math
,
probabilities
2300
x1681
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x5706
1042C
Array Product
constructive algorithms
,
greedy
,
math
1700
x4624
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x15105
1042A
Benches
binary search
,
implementation
1100
x12484
1041F
Ray in the tube
data structures
,
divide and conquer
,
dp
,
math
2500
x1438
1041E
Tree Reconstruction
constructive algorithms
,
data structures
,
graphs
,
greedy
1900
x3498
1041D
Glider
binary search
,
data structures
,
two pointers
1700
x5789
1041C
Coffee Break
binary search
,
data structures
,
greedy
,
two pointers
1600
x9234
1041B
Buying a TV Set
math
1000
x13639
1041A
Heist
greedy
,
implementation
,
sortings
800
x24444
1040B
Shashlik Cooking
dp
,
greedy
,
math
1300
x7009
1040A
Palindrome Dance
greedy
1000
x9314
1039E
Summer Oenothera Exhibition
data structures
3400
x263
1039D
You Are Given a Tree
data structures
,
dp
,
trees
2800
x1643
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1311
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2275
1039A
Timetable
constructive algorithms
,
data structures
,
greedy
,
math
2300
x771
1038F
Wrap Around
dp
,
strings
2900
x290
1038E
Maximum Matching
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x951
1038D
Slime
dp
,
greedy
,
implementation
1800
x8109
1038C
Gambling
greedy
,
sortings
1300
x9330
1038B
Non-Coprime Partition
constructive algorithms
,
math
1100
x13081
1038A
Equality
implementation
,
strings
800
x14403
1037H
Security
data structures
,
string suffix structures
3200
x959
1037G
A Game on Strings
games
3200
x295
1037F
Maximum Reduction
combinatorics
,
data structures
,
math
2500
x929
1037E
Trips
graphs
2200
x2637
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13759
1037C
Equalize
dp
,
greedy
,
strings
1300
x18280
1037B
Reach Median
greedy
1300
x10181
1037A
Packets
constructive algorithms
,
greedy
,
math
1300
x10883
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x361
1036F
Relatively Prime Powers
combinatorics
,
math
,
number theory
2400
x1357
1036E
Covered Points
fft
,
geometry
,
number theory
2400
x1406
1036D
Vasya and Arrays
greedy
,
two pointers
1600
x8960
1036C
Classy Numbers
combinatorics
,
dp
1900
x8523
1036B
Diagonal Walking v.2
math
1600
x5609
1036A
Function Height
math
1000
x10030
1034E
Little C Loves 3 III
bitmasks
,
dp
,
math
3200
x585
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x431
1034C
Region Separation
combinatorics
,
dp
,
number theory
,
trees
2700
x844
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2072
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