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Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)
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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
1972B
Coin Games
games
,
math
x11657
1972A
Contest Proposal
brute force
,
greedy
x13340
1969F
Card Pairing
dp
,
greedy
,
implementation
x70
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
x662
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
x2560
1969C
Minimizing the Sum
dp
,
implementation
x4900
1969B
Shifts and Sorting
constructive algorithms
,
greedy
x12254
1969A
Two Friends
constructive algorithms
,
implementation
,
math
x13968
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
dsu
,
hashing
,
string suffix structures
,
strings
x596
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
x1722
1968F
Equal XOR Segments
binary search
,
data structures
x1801
1968E
Cells Arrangement
constructive algorithms
x4623
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
math
x7726
1968C
Assembly via Remainders
constructive algorithms
,
number theory
x13734
1968B
Prefiquence
greedy
,
two pointers
x17619
1968A
Maximize?
brute force
,
math
,
number theory
x20550
1967F
Next and Prev
brute force
,
data structures
,
schedules
x13
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
x33
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
x84
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
two pointers
x291
1967C
Fenwick Tree
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
matrices
,
trees
x975
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
x2371
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
x7946
1967A
Permutation Counting
implementation
,
math
,
sortings
x7257
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x9890
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x12840
1965F
Conference
data structures
,
flows
3300
x54
1965E
Connected Cubes
constructive algorithms
,
games
3100
x146
1965D
Missing Subarray Sum
constructive algorithms
2900
x215
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1236
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x4286
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x8594
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x241
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x299
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x906
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3294
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x6967
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x14050
1957A
Stickogon
constructive algorithms
,
greedy
800
x18745
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x243
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x618
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1151
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3013
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10168
1956B
Nene and the Card Game
games
,
greedy
800
x18216
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18302
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x962
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3253
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5660
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6864
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12369
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x17141
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x23119
1955A
Yogurt Sale
math
800
x35359
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x190
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1672
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4673
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x14990
1954B
Make It Ugly
implementation
,
math
1200
x14836
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x19708
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x681
1952I
Dark Matter
bitmasks
,
geometry
x333
1952H
Palindrome
implementation
,
strings
x347
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x911
1952F
Grid
brute force
x1628
1952E
Sweep Line
combinatorics
,
games
,
math
x206
1952D
Are You a Procrastinator?
implementation
x4106
1952C
They Have Fooled
brute force
,
schedules
x2700
1952B
Is it stated?
strings
x10215
1952A
Are You a Robot, Again?
strings
x11281
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x40
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x187
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x239
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
x4586
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9293
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x11644
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x16001
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3362
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7351
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x11577
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x19795
1950C
Clock Conversion
implementation
,
math
800
x34224
1950B
Upscaling
implementation
800
x32631
1950A
Stair, Peak, or Neither?
implementation
800
x42703
1949K
Make Triangle
constructive algorithms
,
math
2800
x223
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x306
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1071
1949H
Division Avoidance
greedy
,
math
3100
x68
1949G
Scooter
graphs
,
greedy
2300
x617
1949F
Dating
greedy
,
sortings
,
trees
2200
x708
1949E
Damage per Second
brute force
,
math
2900
x78
1949D
Funny or Scary?
constructive algorithms
2600
x297
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1098
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x1569
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x80
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x592
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1107
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2573
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