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Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)
04:07:16
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two pointers
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
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x413
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x763
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1561
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8026
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5226
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x864
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4736
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15550
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4362
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x526
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x9710
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7714
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x292
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21215
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1851
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10485
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4234
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9203
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13178
1462A
Favorite Sequence
implementation
,
two pointers
800
x39894
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3794
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1484
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5303
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1213
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x1224
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1291
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1162
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2112
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x64
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x999
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8661
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2161
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4652
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14712
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1459
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x355
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x11694
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5528
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7545
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4158
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8621
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11386
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2490
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x286
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x892
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9789
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2211
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x27744
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1067
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x297
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6449
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x346
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18343
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10229
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x447
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1389
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12747
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4615
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1059
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5408
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x900
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x22166
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x965
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19021
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1441
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x2982
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3958
1366B
Shuffle
math
,
two pointers
1300
x19578
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x18409
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26769
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8941
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27051
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8007
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10188
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x29102
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19260
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12194
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x36302
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5829
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x10973
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x7947
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10416
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3906
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12107
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1603
1326E
Bombs
data structures
,
two pointers
2400
x1961
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x26697
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x513
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x703
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11320
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6069
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x15756
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4917
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1662
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4098
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1748
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3409
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12293
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7201
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15552
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