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Before contest
Codeforces Round 941 (Div. 1)
18:44:05
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Before contest
Codeforces Round 941 (Div. 2)
18:44:05
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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
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25319
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x30077
1927A
Make it White
greedy
,
strings
800
x39356
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2892
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1447
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9798
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13311
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x22699
1926B
Vlad and Shapes
geometry
,
implementation
800
x29361
1926A
Vlad and the Best of Five
implementation
800
x41302
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3186
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18071
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27014
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x123
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x384
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x751
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1027
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2253
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12195
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x319
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3112
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5785
1923C
Find B
constructive algorithms
,
greedy
1400
x12920
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x15994
1923A
Moving Chips
greedy
,
implementation
800
x23049
1922F
Replace on Segment
dp
,
graph matchings
2500
x1145
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6965
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5144
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16713
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x18852
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25742
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1109
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3405
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8824
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19839
1921C
Sending Messages
greedy
,
math
900
x27089
1921B
Arranging Cats
greedy
,
implementation
800
x31811
1921A
Square
greedy
,
math
800
x39637
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x394
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x867
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2330
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5055
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11703
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19118
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26367
1919H
Tree Diameter
interactive
,
trees
2000
x127
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x167
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x730
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2007
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x761
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3572
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16682
1919B
Plus-Minus Split
greedy
800
x28720
1919A
Wallet Exchange
games
,
math
800
x31571
1918G
Permutation of Given
constructive algorithms
,
math
2700
x417
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x762
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1530
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4205
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12409
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21937
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x28601
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x886
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1258
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1643
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9314
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19218
1917A
Least Product
constructive algorithms
,
math
800
x24069
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x499
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x581
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x401
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2085
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x7836
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16566
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23468
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24438
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5371
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x11437
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18236
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x27400
1915C
Can I Square?
binary search
,
implementation
800
x37099
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38135
1915A
Odd One Out
bitmasks
,
implementation
800
x49053
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1209
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1655
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3642
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x11141
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11057
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x17947
1914C
Quests
greedy
,
math
1100
x20527
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x28392
1914A
Problemsolving Log
implementation
,
strings
800
x29483
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x286
1913E
Matrix Problem
flows
,
graphs
2400
x895
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2676
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13525
1913B
Swap and Delete
strings
1000
x21431
1913A
Rating Increase
implementation
800
x22178
1912L
LOL Lovers
strings
800
x6243
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x1984
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