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Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)
25:03:23
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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
#
Name
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x6881
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13204
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15701
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x25890
1931B
Make Equal
greedy
800
x29847
1931A
Recovering a Small String
brute force
,
strings
800
x33397
1930I
Counting Is Fun
combinatorics
3500
x49
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x118
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x244
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x606
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x979
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2346
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3659
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6365
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x13487
1930A
Maximise The Score
greedy
,
sortings
800
x17055
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1610
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1485
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4130
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13138
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x23686
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x28753
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x208
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1526
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3710
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7415
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15142
1928A
Rectangle Cutting
geometry
,
math
800
x21071
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1481
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3750
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12297
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18136
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25420
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x30196
1927A
Make it White
greedy
,
strings
800
x39511
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2903
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1458
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9870
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13381
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x22824
1926B
Vlad and Shapes
geometry
,
implementation
800
x29501
1926A
Vlad and the Best of Five
implementation
800
x41548
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3197
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18128
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27076
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x123
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x386
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x756
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1029
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2266
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12254
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x325
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3135
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5836
1923C
Find B
constructive algorithms
,
greedy
1400
x13014
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x16068
1923A
Moving Chips
greedy
,
implementation
800
x23152
1922F
Replace on Segment
dp
,
graph matchings
2500
x1158
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7005
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5192
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16779
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x18938
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25818
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1113
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3418
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8861
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19888
1921C
Sending Messages
greedy
,
math
900
x27182
1921B
Arranging Cats
greedy
,
implementation
800
x31882
1921A
Square
greedy
,
math
800
x39767
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x395
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x868
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2341
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5072
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11746
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19168
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26409
1919H
Tree Diameter
interactive
,
trees
2000
x128
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x170
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x736
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2018
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x770
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3585
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16732
1919B
Plus-Minus Split
greedy
800
x28750
1919A
Wallet Exchange
games
,
math
800
x31640
1918G
Permutation of Given
constructive algorithms
,
math
2700
x418
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x765
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1536
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4223
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12457
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21998
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x28654
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x892
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1261
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1651
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9347
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19288
1917A
Least Product
constructive algorithms
,
math
800
x24128
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x500
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