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Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)
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data structures
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
1481E
Sorting Books
data structures
,
dp
,
greedy
2500
x1996
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x960
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x3901
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x6741
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x117
1477B
Nezzar and Binary String
data structures
,
greedy
1900
x3063
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x526
1476F
Lanterns
binary search
,
data structures
,
dp
3000
x618
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2240
1474D
Cleaning
data structures
,
dp
,
greedy
,
math
2200
x3870
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x12180
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9304
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7714
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x291
1469F
Power Sockets
binary search
,
data structures
,
greedy
2600
x824
1468M
Similar Sets
data structures
,
graphs
,
implementation
2300
x905
1468C
Berpizza
data structures
,
implementation
1400
x7414
1468B
Bakery
data structures
,
dsu
2900
x200
1468A
LaIS
data structures
,
dp
,
greedy
2200
x1563
1467E
Distinctive Roots in a Tree
data structures
,
dfs and similar
,
dp
,
trees
2500
x1332
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x180
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x10775
1464F
My Beautiful Madness
data structures
,
trees
3500
x273
1462F
The Treasure of The Segments
binary search
,
data structures
,
greedy
1800
x6665
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x8893
1458F
Range Diameter Sum
data structures
,
trees
3500
x258
1458E
Nim Shortcuts
data structures
,
games
3100
x404
1458D
Flip and Reverse
data structures
,
graphs
,
greedy
3100
x971
1455G
Forbidden Value
data structures
,
dp
2900
x397
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3794
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x453
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5303
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x271
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1213
1446D1
Frequency Problem (Easy Version)
data structures
,
greedy
2600
x1603
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3388
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1456
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x1923
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4300
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x214
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1675
1439B
Graph Subset Problem
constructive algorithms
,
data structures
,
graphs
2600
x1353
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x18391
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x948
1437E
Make It Increasing
binary search
,
constructive algorithms
,
data structures
,
dp
,
implementation
2200
x3321
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2108
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6153
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8660
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x23290
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2161
1428E
Carrots for Rabbits
binary search
,
data structures
,
greedy
,
math
,
sortings
2200
x3505
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19621
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x302
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x15461
1425I
Impressive Harvesting of The Orchard
data structures
2800
x228
1424G
Years
data structures
,
sortings
1300
x5638
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x506
1423G
Growing flowers
data structures
3500
x178
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x970
1420D
Rescue Nibel!
combinatorics
,
data structures
,
sortings
1800
x7310
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4493
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x474
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1459
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x355
1418D
Trash Problem
data structures
,
implementation
2100
x4173
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x269
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1840
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4170
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x11692
1413F
Roads and Ramen
data structures
,
trees
2800
x702
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6331
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x352
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1874
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4158
1407D
Discrete Centrifugal Jumps
data structures
,
dp
,
graphs
2200
x4619
1406D
Three Sequences
constructive algorithms
,
data structures
,
greedy
,
math
2200
x3368
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2489
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x284
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1138
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1519
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x2160
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5007
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9785
1399F
Yet Another Segments Subset
data structures
,
dp
,
graphs
,
sortings
2300
x1555
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5675
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x17646
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1067
1398E
Two Types of Spells
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
2200
x2173
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x24104
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x297
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16240
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x1940
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x945
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x390
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6119
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x429
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x118
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2246
1383E
Strange Operation
combinatorics
,
data structures
,
dp
2800
x748
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