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Before contest
Codeforces Round 941 (Div. 1)
03:14:11
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Before contest
Codeforces Round 941 (Div. 2)
03:14:11
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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
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x21466
1742C
Stripes
implementation
900
x30808
1742B
Increasing
greedy
,
implementation
,
sortings
800
x44110
1742A
Sum
implementation
800
x64158
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1412
1741F
Multi-Colored Segments
binary search
,
data structures
,
math
,
sortings
2000
x2212
1741E
Sending a Sequence Over the Network
dp
1600
x10729
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x14407
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17160
1741B
Funny Permutation
constructive algorithms
,
math
800
x24738
1741A
Compare T-Shirt Sizes
implementation
,
implementation
,
strings
800
x29745
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x104
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x201
1740G
Dangerous Laser Power
constructive algorithms
,
dsu
,
sortings
3100
x177
1740F
Conditional Mix
combinatorics
,
dp
,
math
2600
x758
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4095
1740D
Knowledge Cards
constructive algorithms
,
data structures
1500
x7670
1740C
Bricks and Bags
constructive algorithms
,
games
,
greedy
,
sortings
1400
x10537
1740B
Jumbo Extra Cheese 2
geometry
,
greedy
,
sortings
800
x13531
1740A
Factorise N+M
constructive algorithms
,
number theory
800
x19572
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x509
1739E
Cleaning Robot
bitmasks
,
dp
2400
x1165
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4851
1739C
Card Game
combinatorics
,
constructive algorithms
,
dp
,
games
1500
x8683
1739B
Array Recovery
constructive algorithms
,
greedy
,
math
1100
x21358
1739A
Immobile Knight
implementation
800
x22281
1738H
Palindrome Addicts
data structures
,
strings
3300
x227
1738G
Anti-Increasing Addicts
constructive algorithms
,
dp
,
greedy
,
math
2900
x366
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1146
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1449
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3312
1738C
Even Number Addicts
dp
,
games
,
greedy
,
math
1500
x10503
1738B
Prefix Sum Addicts
constructive algorithms
,
greedy
,
math
,
sortings
1200
x14718
1738A
Glory Addicts
greedy
,
implementation
,
sortings
800
x13319
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x108
1737F
Ela and Prime GCD
constructive algorithms
,
math
,
number theory
3300
x117
1737E
Ela Goes Hiking
combinatorics
,
dp
,
math
,
probabilities
2500
x888
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1807
1737C
Ela and Crickets
constructive algorithms
,
games
,
implementation
,
math
1500
x5548
1737B
Ela's Fitness and the Luxury Number
binary search
,
implementation
,
math
1300
x9163
1737A
Ela Sorting Books
greedy
,
implementation
,
strings
900
x9934
1736E
Swap and Take
dp
,
greedy
2600
x636
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2390
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1230
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14462
1736B
Playing with GCD
math
,
number theory
1200
x17214
1736A
Make A Equal to B
brute force
,
greedy
,
sortings
800
x22399
1735F
Pebbles and Beads
data structures
,
geometry
2900
x218
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1021
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5264
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9544
1735B
Tea with Tangerines
greedy
,
math
900
x17682
1735A
Working Week
constructive algorithms
,
greedy
,
math
800
x19869
1734F
Zeros and Ones
bitmasks
,
divide and conquer
,
dp
,
math
2500
x766
1734E
Rectangular Congruence
constructive algorithms
,
number theory
2100
x2749
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6000
1734C
Removing Smallest Multiples
greedy
,
math
1200
x16794
1734B
Bright, Nice, Brilliant
constructive algorithms
800
x15561
1734A
Select Three Sticks
brute force
,
greedy
,
sortings
800
x20705
1733E
Conveyor
constructive algorithms
,
dp
,
math
2700
x1089
1733D2
Zero-One (Hard Version)
dp
,
greedy
2000
x3966
1733D1
Zero-One (Easy Version)
constructive algorithms
,
greedy
,
math
1400
x12871
1733C
Parity Shuffle Sorting
constructive algorithms
,
sortings
1300
x15061
1733B
Rule of League
constructive algorithms
,
math
900
x19256
1733A
Consecutive Sum
greedy
,
sortings
800
x20644
1732E
Location
data structures
,
dp
,
math
,
number theory
2800
x406
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1360
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8229
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2451
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5552
1732B
Ugu
brute force
,
dp
,
greedy
,
implementation
900
x13971
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14388
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x654
1731E
Graph Cost
dp
,
greedy
,
math
,
number theory
2000
x2645
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6687
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8896
1731B
Kill Demodogs
greedy
,
math
1100
x16687
1731A
Joey Takes Money
greedy
,
math
800
x22108
1730F
Almost Sorted
bitmasks
,
data structures
,
dp
2700
x409
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x609
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2586
1730C
Minimum Notation
data structures
,
greedy
,
math
,
sortings
1200
x16024
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x11786
1730A
Planets
data structures
,
greedy
,
sortings
800
x22488
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2052
1729F
Kirei and the Linear Function
hashing
,
math
1900
x3978
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x6716
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x18745
1729C
Jumping on Tiles
constructive algorithms
,
strings
1100
x19365
1729B
Decode String
greedy
,
strings
800
x29308
1729A
Two Elevators
math
800
x38780
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x409
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x388
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1646
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x6826
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x15039
1728B
Best Permutation
constructive algorithms
,
greedy
800
x19906
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x24328
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x80
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x282
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