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Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)
19:40:28
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Difficulty:
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greedy
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
1972A
Contest Proposal
brute force
,
greedy
x13302
1969F
Card Pairing
dp
,
greedy
,
implementation
x69
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
x658
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
x2554
1969B
Shifts and Sorting
constructive algorithms
,
greedy
x12237
1968B
Prefiquence
greedy
,
two pointers
x17374
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x12818
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1231
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x4271
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x8576
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x14038
1957A
Stickogon
constructive algorithms
,
greedy
800
x18730
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x617
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3011
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10163
1956B
Nene and the Card Game
games
,
greedy
800
x18205
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18296
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5657
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6864
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x17137
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1670
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x14983
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x19703
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x40
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x187
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x632
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2928
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4584
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9288
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x11642
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x15993
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7347
1949H
Division Avoidance
greedy
,
math
3100
x68
1949G
Scooter
graphs
,
greedy
2300
x617
1949F
Dating
greedy
,
sortings
,
trees
2200
x708
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1097
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x1567
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2571
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20254
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3943
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x8924
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x17638
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23261
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x6832
1945D
Seraphim the Owl
dp
,
greedy
1300
x11911
1945A
Setting up Camp
greedy
,
math
800
x24378
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x20914
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x213
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x341
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1745
1943A
MEX Game 1
games
,
greedy
1300
x15010
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2379
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5410
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9358
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5116
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x29424
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26194
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x12957
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x409
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1065
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6506
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x389
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1158
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7057
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1177
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3039
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5998
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x16491
1934A
Too Min Too Max
greedy
,
math
800
x23220
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17617
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35213
1932D
Card Game
greedy
,
implementation
1400
x9803
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x26471
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13207
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x25893
1931B
Make Equal
greedy
800
x29848
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2347
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
x6366
1930A
Maximise The Score
greedy
,
sortings
800
x17057
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1486
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13141
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x23687
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x28756
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1527
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3710
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15143
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
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18137
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25421
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x30198
1927A
Make it White
greedy
,
strings
800
x39512
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2904
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13384
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18132
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27077
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12256
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x325
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5836
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