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Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)
37:35:42
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Difficulty:
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bitmasks
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
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3522
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3519
1316E
Team Building
bitmasks
,
dp
,
greedy
,
sortings
2300
x3459
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3415
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3388
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3351
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3344
1017D
The Wu
bitmasks
,
brute force
,
data structures
1900
x3334
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3324
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3302
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
x3281
8C
Looking for Order
bitmasks
,
dp
2000
x3245
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3234
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3221
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3208
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3159
1331C
...And after happily lived ever they
*special problem
,
bitmasks
x3131
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3038
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2999
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2987
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x2975
1030E
Vasya and Good Sequences
bitmasks
,
dp
2000
x2967
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x2960
1215E
Marbles
bitmasks
,
dp
2200
x2911
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2901
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2837
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2826
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2811
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2793
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2771
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2758
1238E
Keyboard Purchase
bitmasks
,
dp
2200
x2737
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2726
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2713
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2702
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2686
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2655
768E
Game of Stones
bitmasks
,
dp
,
games
2100
x2630
707D
Persistent Bookcase
bitmasks
,
data structures
,
dfs and similar
,
implementation
2200
x2594
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2563
1185G1
Playlist for Polycarp (easy version)
bitmasks
,
combinatorics
,
dp
2100
x2556
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2461
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2454
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2435
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x2434
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2431
1073E
Segment Sum
bitmasks
,
combinatorics
,
dp
,
math
2300
x2376
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2372
1234F
Yet Another Substring Reverse
bitmasks
,
dp
2200
x2362
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2344
1168C
And Reachability
bitmasks
,
dp
2200
x2324
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2268
778B
Bitwise Formula
bitmasks
,
brute force
,
dfs and similar
,
expression parsing
,
implementation
1800
x2253
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2240
769D
k-Interesting Pairs Of Integers
*special problem
,
bitmasks
,
brute force
,
meet-in-the-middle
1700
x2209
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2200
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2187
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x2185
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2175
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2104
1208F
Bits And Pieces
bitmasks
,
dfs and similar
,
dp
,
greedy
2600
x2097
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2093
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x2082
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2050
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2005
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x1993
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1977
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1974
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1965
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1939
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1939
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1934
993B
Open Communication
bitmasks
,
brute force
1900
x1929
1102F
Elongated Matrix
binary search
,
bitmasks
,
brute force
,
dp
,
graphs
2000
x1902
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x1899
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1851
1209E2
Rotate Columns (hard version)
bitmasks
,
dp
,
greedy
,
sortings
2500
x1846
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x1846
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1838
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1837
1622E
Math Test
bitmasks
,
brute force
,
greedy
2200
x1831
1093G
Multidimensional Queries
bitmasks
,
data structures
2300
x1822
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1810
1185F
Two Pizzas
bitmasks
,
brute force
2100
x1801
1194E
Count The Rectangles
bitmasks
,
brute force
,
data structures
,
geometry
,
sortings
2200
x1731
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1728
1245F
Daniel and Spring Cleaning
bitmasks
,
brute force
,
combinatorics
,
dp
2300
x1717
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1706
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1683
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1671
916B
Jamie and Binary Sequence (changed after round)
bitmasks
,
greedy
,
math
2000
x1671
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1666
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1664
855E
Salazar Slytherin's Locket
bitmasks
,
dp
2200
x1608
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1603
1105E
Helping Hiasat
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2200
x1587
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1570
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1554
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1542
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1519
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