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Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)
06:05:59
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Difficulty:
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two pointers
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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Problems
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Name
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1453
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1234
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14483
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6006
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2455
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5556
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6698
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2589
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2058
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x18780
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x415
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x6841
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1536
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x12959
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5713
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12858
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1182
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2038
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1653
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5474
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x15698
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1080
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1572
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x13923
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x153
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x274
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x15865
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x19861
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5464
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x21206
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x14466
1690D
Black and White Stripe
implementation
,
two pointers
1000
x26698
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16373
1684F
Diverse Segments
data structures
,
two pointers
2600
x841
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3031
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x285
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9487
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15787
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x5980
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x23000
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1422
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8122
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3864
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17619
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20854
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1043
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x189
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4458
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2829
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5497
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15185
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2225
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10599
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3871
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1068
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6171
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6927
1610B
Kalindrome Array
greedy
,
two pointers
1100
x14740
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x727
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9474
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6413
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1189
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x996
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4767
1600E
Array Game
games
,
greedy
,
two pointers
1900
x1916
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x634
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20018
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1542
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x268
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1709
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14295
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1738
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4248
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7691
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2525
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4607
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x306
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3858
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13308
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1439
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1779
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9275
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5490
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x13805
1547C
Pair Programming
greedy
,
two pointers
1100
x22000
1539D
PriceFixed
binary search
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x11267
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x26943
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4973
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12233
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16067
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1963
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14560
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x945
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4087
1515D
Phoenix and Socks
greedy
,
sortings
,
two pointers
1500
x11147
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x581
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x699
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x5993
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x967
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3196
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