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Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)
35:27:55
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Difficulty:
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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
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5565
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13044
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1613
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1905
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1723
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x11524
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7016
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x18850
1811B
Conveyor Belts
implementation
,
math
1000
x19699
1811A
Insert Digit
greedy
,
math
,
strings
800
x29969
1810H
Last Number
combinatorics
,
math
2900
x129
1810G
The Maximum Prefix
dp
3200
x629
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x535
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2961
1810D
Climbing the Tree
binary search
,
math
1700
x7064
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x13762
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17124
1810A
Beautiful Sequence
brute force
,
greedy
800
x20328
1809G
Prediction
combinatorics
,
dp
,
math
2800
x410
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x704
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x789
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x5872
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x11889
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19011
1809A
Garland
implementation
800
x23399
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x417
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x645
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1249
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2159
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3568
1808B
Playing in a Casino
math
,
sortings
1200
x14599
1808A
Lucky Numbers
brute force
,
implementation
900
x17295
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17630
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17798
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x5858
1807E
Interview
binary search
,
implementation
,
interactive
1300
x11813
1807D
Odd Queries
data structures
,
implementation
900
x28553
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29109
1807B
Grab the Candies
greedy
800
x39668
1807A
Plus or Minus
implementation
800
x55492
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x265
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x328
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2679
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x843
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7181
1806B
Mex Master
constructive algorithms
,
greedy
900
x17015
1806A
Walking Master
geometry
,
greedy
,
math
800
x22216
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x321
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x810
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1521
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6029
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x11985
1805B
The String Has a Target
greedy
,
strings
800
x18161
1805A
We Need the Zero
bitmasks
,
brute force
800
x20948
1804H
Code Lock
bitmasks
,
dp
3300
x169
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x849
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1354
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4414
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11493
1804B
Vaccination
greedy
,
implementation
1000
x13764
1804A
Lame King
greedy
,
math
800
x17663
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x12892
1802A
Likes
greedy
,
implementation
800
x15506
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x339
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x544
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2034
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3212
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5779
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8097
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1925
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3678
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12008
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12118
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21640
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21289
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22319
1800B
Count the Number of Pairs
greedy
,
strings
1000
x23903
1800A
Is It a Cat?
implementation
,
strings
800
x29941
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x271
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x696
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x766
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1152
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2266
1799D1
Hot Start Up (easy version)
dp
1900
x4062
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5441
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10798
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11348
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x467
1798E
Multitest Generator
brute force
,
dp
2300
x1496
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9005
1798C
Candy Store
greedy
,
math
,
number theory
1700
x7759
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15857
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x19318
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x328
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1187
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3691
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7207
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x14482
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