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Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)
36:34:17
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trees
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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Name
538E
Demiurges Play Again
dfs and similar
,
dp
,
math
,
trees
2200
x1498
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1443
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1356
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1327
765E
Tree Folding
dfs and similar
,
dp
,
greedy
,
implementation
,
trees
2200
x1246
406D
Hill Climbing
dfs and similar
,
geometry
,
trees
2200
x1126
894D
Ralph And His Tour in Binary Country
brute force
,
data structures
,
trees
2200
x1105
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1088
575B
Bribes
dfs and similar
,
graphs
,
trees
2200
x1038
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1003
690C3
Brain Network (hard)
trees
2200
x882
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x805
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x739
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x729
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x650
1045D
Interstellar battle
math
,
probabilities
,
trees
2200
x634
440D
Berland Federalization
dp
,
trees
2200
x624
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x612
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x521
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x488
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x370
98B
Help King
implementation
,
probabilities
,
trees
2200
x114
600E
Lomsat gelral
data structures
,
dfs and similar
,
dsu
,
trees
2300
x12628
1009F
Dominant Indices
data structures
,
dsu
,
trees
2300
x5088
708C
Centroids
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2300
x2975
543D
Road Improvement
dp
,
trees
2300
x2536
1528C
Trees of Tranquillity
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2495
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2489
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2488
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2484
817F
MEX Queries
binary search
,
data structures
,
trees
2300
x2395
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2355
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2246
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2157
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2092
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1966
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1965
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1948
1695D2
Tree Queries (Hard Version)
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1914
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x1912
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1868
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1810
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1745
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1706
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1699
893F
Subtree Minimum Query
data structures
,
trees
2300
x1662
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1661
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1610
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1570
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1536
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1532
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1521
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1485
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1466
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1446
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1089
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1053
812E
Sagheer and Apple Tree
games
,
trees
2300
x1014
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x975
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x968
573C
Bear and Drawing
constructive algorithms
,
dfs and similar
,
trees
2300
x953
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x900
294E
Shaass the Great
dp
,
trees
2300
x893
566A
Matching Names
dfs and similar
,
strings
,
trees
2300
x869
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x865
509F
Progress Monitoring
dp
,
trees
2300
x862
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2300
x850
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x845
1575I
Illusions of the Desert
data structures
,
trees
2300
x840
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x673
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x671
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x633
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x620
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x554
1252B
Cleaning Robots
dp
,
trees
2300
x501
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x476
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7619
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6191
1051F
The Shortest Statement
graphs
,
shortest paths
,
trees
2400
x2658
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2463
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2435
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2304
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2113
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2042
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1874
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1826
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1728
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1723
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1720
916E
Jamie and Tree
data structures
,
trees
2400
x1561
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1558
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1518
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1455
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1443
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1435
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1398
1088E
Ehab and a component choosing problem
dp
,
greedy
,
math
,
trees
2400
x1395
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1390
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1385
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