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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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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
1618E
Singers' Tour
constructive algorithms
,
math
1700
x7254
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7367
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6722
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8777
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7593
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x8078
1583C
Omkar and Determination
data structures
,
dp
1700
x6974
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3698
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4826
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6711
1578H
Higher Order Functions
implementation
,
strings
1700
x2037
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x340
1562D1
Two Hundred Twenty One (easy version)
data structures
,
dp
,
math
1700
x6369
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5650
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8658
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12860
1551D1
Domino (easy version)
constructive algorithms
,
math
1700
x7134
1550C
Manhattan Subarrays
brute force
,
geometry
,
greedy
,
implementation
1700
x10237
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7637
1538D
Another Problem About Dividing Numbers
constructive algorithms
,
math
,
number theory
1700
x13725
1537D
Deleting Divisors
games
,
math
,
number theory
1700
x12503
1528B
Kavi on Pairing Duty
combinatorics
,
dp
,
math
1700
x8758
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x12025
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x8310
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x7085
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8407
1491C
Pekora and Trampoline
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x7989
1485C
Floor and Mod
binary search
,
brute force
,
math
,
number theory
1700
x10042
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x11763
1478C
Nezzar and Symmetric Array
implementation
,
math
,
sortings
1700
x9845
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8674
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x12805
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9745
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x8130
1469D
Ceil Divisions
brute force
,
constructive algorithms
,
math
,
number theory
1700
x9492
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3781
1468D
Firecrackers
binary search
,
sortings
1700
x4731
1467B
Hills And Valleys
brute force
,
implementation
1700
x11007
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9845
1453C
Triangles
greedy
,
implementation
1700
x6057
1451D
Circle Game
games
,
geometry
,
math
1700
x9578
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8836
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8281
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6528
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x8033
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x10379
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x11236
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x10656
1392D
Omkar and Bed Wars
dp
,
greedy
1700
x8985
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10714
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x13353
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11946
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x17568
1361A
Johnny and Contribution
constructive algorithms
,
graphs
,
greedy
,
sortings
1700
x8443
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x12503
1359C
Mixing Water
binary search
,
math
1700
x13926
1346E
Magic Tricks
*special problem
,
dp
,
graphs
1700
x380
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12762
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x7873
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x11417
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10897
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12641
1332D
Walk on Matrix
bitmasks
,
constructive algorithms
,
math
1700
x8199
1329B
Dreamoon Likes Sequences
bitmasks
,
combinatorics
,
math
1700
x6715
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x12186
1324E
Sleeping Schedule
dp
,
implementation
1700
x13738
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x6058
1313B
Different Rules
constructive algorithms
,
greedy
,
implementation
,
math
1700
x6713
1312D
Count the Arrays
combinatorics
,
math
1700
x9548
1310A
Recommendations
data structures
,
greedy
,
sortings
1700
x5191
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9382
1295B
Infinite Prefixes
math
,
strings
1700
x9347
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x6409
1280A
Cut and Paste
implementation
,
math
1700
x5465
1279D
Santa's Bot
combinatorics
,
math
,
probabilities
1700
x6402
1278C
Berry Jam
data structures
,
dp
,
greedy
,
implementation
1700
x8098
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8681
1267E
Elections
greedy
1700
x3296
1260C
Infinite Fence
greedy
,
math
,
number theory
1700
x8272
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7615
1256C
Platforms Jumping
greedy
1700
x6932
1254A
Feeding Chicken
constructive algorithms
,
greedy
,
implementation
1700
x5238
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x9315
1249E
By Elevator or Stairs?
dp
,
shortest paths
1700
x9790
1239A
Ivan the Fool and the Probability Theory
combinatorics
,
dp
,
math
1700
x7380
1237C1
Balanced Removals (Easier)
constructive algorithms
,
geometry
,
greedy
1700
x6114
1228C
Primes and Multiplication
math
,
number theory
1700
x9077
1227C
Messy
constructive algorithms
1700
x5534
1219C
Periodic integer number
implementation
,
strings
1700
x1801
1217C
The Number Of Good Substrings
binary search
,
bitmasks
,
brute force
1700
x7478
1216C
White Sheet
geometry
,
math
1700
x9323
1215D
Ticket Game
games
,
greedy
,
math
1700
x6205
1211C
Ice Cream
*special problem
,
greedy
,
sortings
1700
x489
1210B
Marcin and Training Camp
brute force
,
greedy
1700
x5832
1210A
Anadi and Domino
brute force
,
graphs
1700
x5172
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x9468
1204C
Anna, Svyatoslav and Maps
dp
,
graphs
,
greedy
,
shortest paths
1700
x6737
1203D2
Remove the Substring (hard version)
binary search
,
greedy
,
implementation
,
two pointers
1700
x7462
1202B
You Are Given a Decimal String...
brute force
,
dp
,
shortest paths
1700
x4579
1194D
1-2-K Game
games
,
math
1700
x6592
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