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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
5 days
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Difficulty:
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dp
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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Custom test
Problems
#
Name
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4583
1678B2
Tokitsukaze and Good 01-String (hard version)
dp
,
greedy
,
implementation
1800
x6403
1677A
Tokitsukaze and Strange Inequality
brute force
,
data structures
,
dp
1600
x8129
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x5038
1674G
Remove Directed Edges
dfs and similar
,
dp
,
graphs
2000
x2396
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5127
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3551
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x7382
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6021
1633D
Make Them Equal
dp
,
greedy
1600
x13083
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12275
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x7857
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10631
1625C
Road Optimization
dp
1700
x10091
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3958
1620C
BA-String
brute force
,
dp
,
greedy
,
implementation
,
math
1800
x6371
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x8724
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4710
1613D
MEX Sequences
dp
,
math
1900
x4445
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2391
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3662
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2587
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6424
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4789
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7115
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7635
1583C
Omkar and Determination
data structures
,
dp
1700
x6816
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5273
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3598
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3567
1575D
Divisible by Twenty-Five
brute force
,
dfs and similar
,
dp
1800
x2419
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8560
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x177
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x325
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11863
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4021
1562D1
Two Hundred Twenty One (easy version)
data structures
,
dp
,
math
1700
x6191
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5395
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4616
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8347
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x11782
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6711
1551E
Fixed Points
binary search
,
brute force
,
dp
2000
x3694
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12302
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7500
1528B
Kavi on Pairing Duty
combinatorics
,
dp
,
math
1700
x8488
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x13943
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x9402
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14622
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7351
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11549
1513C
Add One
dp
,
matrices
1600
x13274
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x7827
1512F
Education
brute force
,
dp
,
greedy
,
implementation
1900
x5950
1509C
The Sports Festival
dp
,
greedy
1800
x11851
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4102
1498C
Planar Reflections
brute force
,
data structures
,
dp
1600
x9211
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8049
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5241
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x6908
1491C
Pekora and Trampoline
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x7727
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x6763
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8403
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x11080
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6428
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x9759
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9338
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7735
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10508
1458B
Glass Half Spilled
dp
2000
x3388
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x12005
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7776
1446B
Catching Cheaters
dp
,
strings
1800
x7563
1442A
Extreme Subtraction
constructive algorithms
,
dp
,
greedy
1800
x8579
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x10135
1427C
The Hard Work of Paparazzi
dp
2000
x5487
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5127
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8089
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4191
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5545
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7580
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4168
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7098
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8870
1398D
Colored Rectangles
dp
,
greedy
,
sortings
1800
x11023
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x24286
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x13543
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6465
1392D
Omkar and Bed Wars
dp
,
greedy
1700
x8451
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4941
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x15853
1384B1
Koa and the Beach (Easy Version)
brute force
,
dp
,
greedy
1900
x3842
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4776
1381B
Unmerge
dp
1800
x8502
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5429
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15026
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9151
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8275
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5136
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6495
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