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Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)
36:46:15
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constructive algorithms
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
1700F
Puzzle
constructive algorithms
,
dp
,
greedy
2600
x838
1700E
Serega the Pirate
brute force
,
constructive algorithms
2600
x824
1700C
Helping the Nature
constructive algorithms
,
data structures
,
greedy
1700
x10450
1700B
Palindromic Numbers
constructive algorithms
,
implementation
,
math
1100
x18235
1700A
Optimal Path
constructive algorithms
,
greedy
,
math
800
x22532
1699C
The Third Problem
combinatorics
,
constructive algorithms
,
math
1700
x9380
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19144
1699A
The Third Three Number Problem
constructive algorithms
,
math
800
x23623
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x575
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x8668
1698B
Rising Sand
constructive algorithms
,
greedy
,
implementation
800
x20639
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x512
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1135
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4259
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x13922
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x846
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5167
1696C
Fishingprince Plays With Array
constructive algorithms
,
greedy
,
implementation
,
math
1400
x11298
1695E
Ambiguous Dominoes
constructive algorithms
,
dfs and similar
,
graphs
2700
x424
1695D2
Tree Queries (Hard Version)
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1914
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2085
1694B
Paranoid String
constructive algorithms
,
greedy
1200
x18482
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5462
1691C
Sum of Substrings
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1400
x15072
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x21198
1690A
Print a Pedestal (Codeforces logo?)
constructive algorithms
,
greedy
800
x32493
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1147
1688C
Manipulating History
constructive algorithms
,
greedy
,
strings
1700
x7886
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x17846
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x213
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3481
1685D2
Permutation Weight (Hard Version)
constructive algorithms
,
greedy
3500
x103
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x420
1685C
Bring Balance
brute force
,
constructive algorithms
,
greedy
2600
x911
1685A
Circular Local MiniMax
constructive algorithms
,
greedy
,
sortings
1100
x16462
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x235
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x577
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3031
1684D
Traps
constructive algorithms
,
greedy
,
sortings
1700
x9288
1684C
Column Swapping
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x12005
1684B
Z mod X = C
constructive algorithms
,
math
800
x20593
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x23456
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x559
1682D
Circular Spanning Tree
constructive algorithms
,
implementation
,
trees
2000
x3167
1682C
LIS or Reverse LIS?
constructive algorithms
,
greedy
,
implementation
,
math
1400
x14101
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x17141
1677C
Tokitsukaze and Two Colorful Tapes
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1900
x3393
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x6154
1674D
A-B-C Sort
constructive algorithms
,
implementation
,
sortings
1200
x15757
1674A
Number Transformation
constructive algorithms
,
math
800
x25644
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x768
1672H
Zigu Zagu
constructive algorithms
,
data structures
,
greedy
2700
x914
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x313
1672F2
Checker for Array Shuffling
constructive algorithms
,
dfs and similar
,
graphs
2800
x771
1672F1
Array Shuffling
constructive algorithms
,
graphs
,
greedy
2000
x2965
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2091
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x5980
1672C
Unequal Array
constructive algorithms
,
greedy
,
implementation
1100
x12912
1672B
I love AAAB
constructive algorithms
,
implementation
800
x15557
1671D
Insert a Progression
brute force
,
constructive algorithms
,
greedy
1600
x7252
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1666
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x641
1667C
Half Queen Cover
constructive algorithms
,
math
2400
x1513
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1291
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1381
1666E
Even Split
binary search
,
constructive algorithms
,
greedy
,
math
2500
x679
1666C
Connect the Points
brute force
,
constructive algorithms
,
geometry
1800
x3077
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3681
1665B
Array Cloning Technique
constructive algorithms
,
greedy
,
sortings
900
x18666
1665A
GCD vs LCM
constructive algorithms
,
math
800
x22914
1663H
Cross-Language Program
*special problem
,
constructive algorithms
x1259
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x203
1662M
Bottle Arrangements
constructive algorithms
x3268
1660E
Matrix and Shifts
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x6955
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1458
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3862
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x10598
1659A
Red Versus Blue
constructive algorithms
,
greedy
,
implementation
,
math
1000
x16909
1658F
Juju and Binary String
brute force
,
constructive algorithms
,
greedy
,
math
2700
x724
1658C
Shinju and the Lost Permutation
constructive algorithms
,
math
1700
x9080
1658A
Marin and Photoshoot
constructive algorithms
,
implementation
,
math
800
x20125
1656I
Neighbour Ordering
constructive algorithms
,
graphs
3500
x93
1656G
Cycle Palindrome
constructive algorithms
,
graphs
,
math
3200
x269
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x986
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3280
1656D
K-good
constructive algorithms
,
math
,
number theory
1900
x6588
1656C
Make Equal With Mod
constructive algorithms
,
math
,
number theory
,
sortings
1200
x18459
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x70
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x493
1651B
Prove Him Wrong
constructive algorithms
,
greedy
800
x19344
1650D
Twist the Permutation
brute force
,
constructive algorithms
,
implementation
,
math
1300
x12653
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6180
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5102
1647C
Madoka and Childish Pranks
constructive algorithms
,
greedy
1300
x12355
1647B
Madoka and the Elegant Gift
brute force
,
constructive algorithms
,
graphs
,
implementation
1200
x15048
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x389
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3532
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13117
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20853
1644B
Anti-Fibonacci Permutation
brute force
,
constructive algorithms
,
implementation
800
x20439
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